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table = getTable(identity, databaseName, tableName);
if (table.isEmpty()) {
return Optional.empty();
}
List partitionNames;
TableSource tableSource = getTableSource(databaseName, tableName);
switch (tableSource) {
case CREATED_IN_THIS_TRANSACTION:
partitionNames = ImmutableList.of();
break;
case PRE_EXISTING_TABLE:
Optional> partitionNameResult = delegate.getPartitionNamesByFilter(identity, databaseName, tableName, columnNames, partitionKeysFilter);
if (partitionNameResult.isEmpty()) {
throw new PrestoException(TRANSACTION_CONFLICT, format("Table '%s.%s' was dropped by another transaction", databaseName, tableName));
}
partitionNames = partitionNameResult.get();
break;
default:
throw new UnsupportedOperationException("Unknown table source");
}
Map, Action> partitionActionsOfTable = partitionActions.computeIfAbsent(table.get().getSchemaTableName(), k -> new HashMap<>());
ImmutableList.Builder resultBuilder = ImmutableList.builder();
// alter/remove newly-altered/dropped partitions from the results from underlying metastore
for (String partitionName : partitionNames) {
List partitionValues = toPartitionValues(partitionName);
Action partitionAction = partitionActionsOfTable.get(partitionValues);
if (partitionAction == null) {
resultBuilder.add(partitionName);
continue;
}
switch (partitionAction.getType()) {
case ADD:
throw new PrestoException(TRANSACTION_CONFLICT, format("Another transaction created partition %s in table %s.%s", partitionValues, databaseName, tableName));
case DROP:
case DROP_PRESERVE_DATA:
// do nothing
break;
case ALTER:
case INSERT_EXISTING:
resultBuilder.add(partitionName);
break;
default:
throw new IllegalStateException("Unknown action type");
}
}
// add newly-added partitions to the results from underlying metastore.
if (!partitionActionsOfTable.isEmpty()) {
for (Action partitionAction : partitionActionsOfTable.values()) {
if (partitionAction.getType() == ActionType.ADD) {
List values = partitionAction.getData().getPartition().getValues();
resultBuilder.add(makePartName(columnNames, values));
}
}
}
return Optional.of(resultBuilder.build());
}
public synchronized Map> getPartitionsByNames(HiveIdentity identity, String databaseName, String tableName, List partitionNames)
{
checkReadable();
TableSource tableSource = getTableSource(databaseName, tableName);
Map, Action> partitionActionsOfTable = partitionActions.computeIfAbsent(new SchemaTableName(databaseName, tableName), k -> new HashMap<>());
ImmutableList.Builder partitionNamesToQueryBuilder = ImmutableList.builder();
ImmutableMap.Builder> resultBuilder = ImmutableMap.builder();
for (String partitionName : partitionNames) {
List partitionValues = toPartitionValues(partitionName);
Action partitionAction = partitionActionsOfTable.get(partitionValues);
if (partitionAction == null) {
switch (tableSource) {
case PRE_EXISTING_TABLE:
partitionNamesToQueryBuilder.add(partitionName);
break;
case CREATED_IN_THIS_TRANSACTION:
resultBuilder.put(partitionName, Optional.empty());
break;
default:
throw new UnsupportedOperationException("unknown table source");
}
}
else {
resultBuilder.put(partitionName, getPartitionFromPartitionAction(partitionAction));
}
}
List partitionNamesToQuery = partitionNamesToQueryBuilder.build();
if (!partitionNamesToQuery.isEmpty()) {
Map> delegateResult = delegate.getPartitionsByNames(
identity,
databaseName,
tableName,
partitionNamesToQuery);
resultBuilder.putAll(delegateResult);
}
return resultBuilder.build();
}
private static Optional getPartitionFromPartitionAction(Action partitionAction)
{
switch (partitionAction.getType()) {
case ADD:
case ALTER:
case INSERT_EXISTING:
return Optional.of(partitionAction.getData().getAugmentedPartitionForInTransactionRead());
case DROP:
case DROP_PRESERVE_DATA:
return Optional.empty();
default:
throw new IllegalStateException("Unknown action type");
}
}
public synchronized void addPartition(
ConnectorSession session,
String databaseName,
String tableName,
Partition partition,
Path currentLocation,
PartitionStatistics statistics)
{
setShared();
checkArgument(getPrestoQueryId(partition).isPresent());
Map, Action> partitionActionsOfTable = partitionActions.computeIfAbsent(new SchemaTableName(databaseName, tableName), k -> new HashMap<>());
Action oldPartitionAction = partitionActionsOfTable.get(partition.getValues());
HdfsContext hdfsContext = new HdfsContext(session, databaseName, tableName);
HiveIdentity identity = new HiveIdentity(session);
if (oldPartitionAction == null) {
partitionActionsOfTable.put(
partition.getValues(),
new Action<>(ActionType.ADD, new PartitionAndMore(identity, partition, currentLocation, Optional.empty(), statistics, statistics), hdfsContext, identity));
return;
}
switch (oldPartitionAction.getType()) {
case DROP:
case DROP_PRESERVE_DATA:
if (!oldPartitionAction.getHdfsContext().getIdentity().getUser().equals(session.getUser())) {
throw new PrestoException(TRANSACTION_CONFLICT, "Operation on the same partition with different user in the same transaction is not supported");
}
partitionActionsOfTable.put(
partition.getValues(),
new Action<>(ActionType.ALTER, new PartitionAndMore(identity, partition, currentLocation, Optional.empty(), statistics, statistics), hdfsContext, identity));
break;
case ADD:
case ALTER:
case INSERT_EXISTING:
throw new PrestoException(ALREADY_EXISTS, format("Partition already exists for table '%s.%s': %s", databaseName, tableName, partition.getValues()));
default:
throw new IllegalStateException("Unknown action type");
}
}
public synchronized void dropPartition(ConnectorSession session, String databaseName, String tableName, List partitionValues, boolean deleteData)
{
setShared();
Map, Action> partitionActionsOfTable = partitionActions.computeIfAbsent(new SchemaTableName(databaseName, tableName), k -> new HashMap<>());
Action oldPartitionAction = partitionActionsOfTable.get(partitionValues);
if (oldPartitionAction == null) {
HdfsContext hdfsContext = new HdfsContext(session, databaseName, tableName);
HiveIdentity identity = new HiveIdentity(session);
if (deleteData) {
partitionActionsOfTable.put(partitionValues, new Action<>(ActionType.DROP, null, hdfsContext, identity));
}
else {
partitionActionsOfTable.put(partitionValues, new Action<>(ActionType.DROP_PRESERVE_DATA, null, hdfsContext, identity));
}
return;
}
switch (oldPartitionAction.getType()) {
case DROP:
case DROP_PRESERVE_DATA:
throw new PartitionNotFoundException(new SchemaTableName(databaseName, tableName), partitionValues);
case ADD:
case ALTER:
case INSERT_EXISTING:
throw new PrestoException(
NOT_SUPPORTED,
format("dropping a partition added in the same transaction is not supported: %s %s %s", databaseName, tableName, partitionValues));
default:
throw new IllegalStateException("Unknown action type");
}
}
public synchronized void finishInsertIntoExistingPartition(
ConnectorSession session,
String databaseName,
String tableName,
List partitionValues,
Path currentLocation,
List fileNames,
PartitionStatistics statisticsUpdate)
{
setShared();
HiveIdentity identity = new HiveIdentity(session);
SchemaTableName schemaTableName = new SchemaTableName(databaseName, tableName);
Map, Action> partitionActionsOfTable = partitionActions.computeIfAbsent(schemaTableName, k -> new HashMap<>());
Action oldPartitionAction = partitionActionsOfTable.get(partitionValues);
if (oldPartitionAction == null) {
Partition partition = delegate.getPartition(identity, databaseName, tableName, partitionValues)
.orElseThrow(() -> new PartitionNotFoundException(schemaTableName, partitionValues));
String partitionName = getPartitionName(identity, databaseName, tableName, partitionValues);
PartitionStatistics currentStatistics = delegate.getPartitionStatistics(identity, databaseName, tableName, ImmutableSet.of(partitionName)).get(partitionName);
if (currentStatistics == null) {
throw new PrestoException(HIVE_METASTORE_ERROR, "currentStatistics is null");
}
HdfsContext context = new HdfsContext(session, databaseName, tableName);
partitionActionsOfTable.put(
partitionValues,
new Action<>(
ActionType.INSERT_EXISTING,
new PartitionAndMore(
identity,
partition,
currentLocation,
Optional.of(fileNames),
merge(currentStatistics, statisticsUpdate),
statisticsUpdate),
context,
identity));
return;
}
switch (oldPartitionAction.getType()) {
case DROP:
case DROP_PRESERVE_DATA:
throw new PartitionNotFoundException(schemaTableName, partitionValues);
case ADD:
case ALTER:
case INSERT_EXISTING:
throw new UnsupportedOperationException("Inserting into a partition that were added, altered, or inserted into in the same transaction is not supported");
default:
throw new IllegalStateException("Unknown action type");
}
}
private String getPartitionName(HiveIdentity identity, String databaseName, String tableName, List partitionValues)
{
Table table = getTable(identity, databaseName, tableName)
.orElseThrow(() -> new TableNotFoundException(new SchemaTableName(databaseName, tableName)));
return getPartitionName(table, partitionValues);
}
private String getPartitionName(Table table, List partitionValues)
{
List columnNames = table.getPartitionColumns().stream()
.map(Column::getName)
.collect(toImmutableList());
return makePartName(columnNames, partitionValues);
}
public synchronized void createRole(String role, String grantor)
{
setExclusive((delegate, hdfsEnvironment) -> delegate.createRole(role, grantor));
}
public synchronized void dropRole(String role)
{
setExclusive((delegate, hdfsEnvironment) -> delegate.dropRole(role));
}
public synchronized Set listRoles()
{
checkReadable();
return delegate.listRoles();
}
public synchronized void grantRoles(Set roles, Set grantees, boolean adminOption, HivePrincipal grantor)
{
setExclusive((delegate, hdfsEnvironment) -> delegate.grantRoles(roles, grantees, adminOption, grantor));
}
public synchronized void revokeRoles(Set roles, Set grantees, boolean adminOption, HivePrincipal grantor)
{
setExclusive((delegate, hdfsEnvironment) -> delegate.revokeRoles(roles, grantees, adminOption, grantor));
}
public synchronized Set listGrantedPrincipals(String role)
{
checkReadable();
return delegate.listGrantedPrincipals(role);
}
public synchronized Set listRoleGrants(HivePrincipal principal)
{
checkReadable();
return delegate.listRoleGrants(principal);
}
public synchronized Set listTablePrivileges(HiveIdentity identity, String databaseName, String tableName, Optional principal)
{
checkReadable();
SchemaTableName schemaTableName = new SchemaTableName(databaseName, tableName);
Action tableAction = tableActions.get(schemaTableName);
if (tableAction == null) {
return delegate.listTablePrivileges(databaseName, tableName, getTableOwner(identity, databaseName, tableName), principal);
}
switch (tableAction.getType()) {
case ADD:
case ALTER:
if (principal.isPresent() && principal.get().getType() == PrincipalType.ROLE) {
return ImmutableSet.of();
}
String owner = tableAction.getData().getTable().getOwner();
if (principal.isPresent() && !principal.get().getName().equals(owner)) {
return ImmutableSet.of();
}
Collection privileges = tableAction.getData().getPrincipalPrivileges().getUserPrivileges().get(owner);
return ImmutableSet.builder()
.addAll(privileges)
.add(new HivePrivilegeInfo(OWNERSHIP, true, new HivePrincipal(USER, owner), new HivePrincipal(USER, owner)))
.build();
case INSERT_EXISTING:
return delegate.listTablePrivileges(databaseName, tableName, getTableOwner(identity, databaseName, tableName), principal);
case DROP:
throw new TableNotFoundException(schemaTableName);
default:
throw new IllegalStateException("Unknown action type");
}
}
private String getTableOwner(HiveIdentity identity, String databaseName, String tableName)
{
return getExistingTable(identity, databaseName, tableName).getOwner();
}
private Table getExistingTable(HiveIdentity identity, String databaseName, String tableName)
{
return delegate.getTable(identity, databaseName, tableName)
.orElseThrow(() -> new TableNotFoundException(new SchemaTableName(databaseName, tableName)));
}
public synchronized void grantTablePrivileges(HiveIdentity identity, String databaseName, String tableName, HivePrincipal grantee, Set privileges)
{
setExclusive((delegate, hdfsEnvironment) -> delegate.grantTablePrivileges(databaseName, tableName, getTableOwner(identity, databaseName, tableName), grantee, privileges));
}
public synchronized void revokeTablePrivileges(HiveIdentity identity, String databaseName, String tableName, HivePrincipal grantee, Set privileges)
{
setExclusive((delegate, hdfsEnvironment) -> delegate.revokeTablePrivileges(databaseName, tableName, getTableOwner(identity, databaseName, tableName), grantee, privileges));
}
public synchronized void declareIntentionToWrite(ConnectorSession session, WriteMode writeMode, Path stagingPathRoot, SchemaTableName schemaTableName)
{
setShared();
if (writeMode == WriteMode.DIRECT_TO_TARGET_EXISTING_DIRECTORY) {
Map, Action> partitionActionsOfTable = partitionActions.get(schemaTableName);
if (partitionActionsOfTable != null && !partitionActionsOfTable.isEmpty()) {
throw new PrestoException(NOT_SUPPORTED, "Cannot insert into a table with a partition that has been modified in the same transaction when Presto is configured to skip temporary directories.");
}
}
HdfsContext hdfsContext = new HdfsContext(session, schemaTableName.getSchemaName(), schemaTableName.getTableName());
HiveIdentity identity = new HiveIdentity(session);
declaredIntentionsToWrite.add(new DeclaredIntentionToWrite(writeMode, hdfsContext, identity, session.getQueryId(), stagingPathRoot, schemaTableName));
}
public synchronized void commit()
{
try {
switch (state) {
case EMPTY:
break;
case SHARED_OPERATION_BUFFERED:
commitShared();
break;
case EXCLUSIVE_OPERATION_BUFFERED:
requireNonNull(bufferedExclusiveOperation, "bufferedExclusiveOperation is null");
bufferedExclusiveOperation.execute(delegate, hdfsEnvironment);
break;
case FINISHED:
throw new IllegalStateException("Tried to commit buffered metastore operations after transaction has been committed/aborted");
default:
throw new IllegalStateException("Unknown state");
}
}
finally {
state = State.FINISHED;
}
}
public synchronized void rollback()
{
try {
switch (state) {
case EMPTY:
case EXCLUSIVE_OPERATION_BUFFERED:
break;
case SHARED_OPERATION_BUFFERED:
rollbackShared();
break;
case FINISHED:
throw new IllegalStateException("Tried to rollback buffered metastore operations after transaction has been committed/aborted");
default:
throw new IllegalStateException("Unknown state");
}
}
finally {
state = State.FINISHED;
}
}
public void beginQuery(ConnectorSession session)
{
String queryId = session.getQueryId();
HiveIdentity identity = new HiveIdentity(session);
synchronized (this) {
checkState(
currentQueryId.isEmpty() && hiveTransactionSupplier.isEmpty(),
"Query already begun: %s while starting query %s",
currentQueryId,
queryId);
currentQueryId = Optional.of(queryId);
hiveTransactionSupplier = Optional.of(() -> {
long heartbeatInterval = configuredTransactionHeartbeatInterval
.map(Duration::toMillis)
.orElseGet(this::getServerExpectedHeartbeatIntervalMillis);
long transactionId = delegate.openTransaction(identity);
log.debug("Using hive transaction %s for query %s", transactionId, queryId);
ScheduledFuture heartbeatTask = heartbeatExecutor.scheduleAtFixedRate(
() -> delegate.sendTransactionHeartbeat(identity, transactionId),
0,
heartbeatInterval,
MILLISECONDS);
return new HiveTransaction(identity, queryId, transactionId, heartbeatTask);
});
}
}
private long getServerExpectedHeartbeatIntervalMillis()
{
String hiveServerTransactionTimeout = delegate.getConfigValue(TXN_TIMEOUT.getVarname()).orElseGet(() -> TXN_TIMEOUT.getDefaultVal().toString());
Configuration configuration = new Configuration(false);
configuration.set(TXN_TIMEOUT.toString(), hiveServerTransactionTimeout);
return getTimeVar(configuration, TXN_TIMEOUT, MILLISECONDS) / 2;
}
public synchronized Optional getValidWriteIds(ConnectorSession session, HiveTableHandle tableHandle)
{
String queryId = session.getQueryId();
checkState(currentQueryId.equals(Optional.of(queryId)), "Invalid query id %s while current query is", queryId, currentQueryId);
if (!AcidUtils.isTransactionalTable(tableHandle.getTableParameters().orElseThrow(() -> new IllegalStateException("tableParameters missing")))) {
return Optional.empty();
}
if (currentHiveTransaction.isEmpty()) {
currentHiveTransaction = Optional.of(hiveTransactionSupplier
.orElseThrow(() -> new IllegalStateException("hiveTransactionSupplier is not set"))
.get());
}
return Optional.of(currentHiveTransaction.get().getValidWriteIds(delegate, tableHandle));
}
public synchronized void cleanupQuery(ConnectorSession session)
{
String queryId = session.getQueryId();
HiveIdentity identity = new HiveIdentity(session);
checkState(currentQueryId.equals(Optional.of(queryId)), "Invalid query id %s while current query is", queryId, currentQueryId);
Optional transaction = currentHiveTransaction;
currentQueryId = Optional.empty();
currentHiveTransaction = Optional.empty();
hiveTransactionSupplier = Optional.empty();
if (transaction.isEmpty()) {
return;
}
long transactionId = transaction.get().getTransactionId();
ScheduledFuture heartbeatTask = transaction.get().getHeartbeatTask();
heartbeatTask.cancel(true);
// Any failure around aborted transactions, etc would be handled by Hive Metastore commit and PrestoException will be thrown
delegate.commitTransaction(identity, transactionId);
}
@GuardedBy("this")
private void commitShared()
{
checkHoldsLock();
Committer committer = new Committer();
try {
for (Map.Entry> entry : tableActions.entrySet()) {
SchemaTableName schemaTableName = entry.getKey();
Action action = entry.getValue();
switch (action.getType()) {
case DROP:
committer.prepareDropTable(action.getIdentity(), schemaTableName);
break;
case ALTER:
committer.prepareAlterTable(action.getHdfsContext(), action.getIdentity(), action.getData());
break;
case ADD:
committer.prepareAddTable(action.getHdfsContext(), action.getData());
break;
case INSERT_EXISTING:
committer.prepareInsertExistingTable(action.getHdfsContext(), action.getData());
break;
default:
throw new IllegalStateException("Unknown action type");
}
}
for (Map.Entry, Action>> tableEntry : partitionActions.entrySet()) {
SchemaTableName schemaTableName = tableEntry.getKey();
for (Map.Entry, Action> partitionEntry : tableEntry.getValue().entrySet()) {
List partitionValues = partitionEntry.getKey();
Action action = partitionEntry.getValue();
switch (action.getType()) {
case DROP:
committer.prepareDropPartition(action.getIdentity(), schemaTableName, partitionValues, true);
break;
case DROP_PRESERVE_DATA:
committer.prepareDropPartition(action.getIdentity(), schemaTableName, partitionValues, false);
break;
case ALTER:
committer.prepareAlterPartition(action.getHdfsContext(), action.getIdentity(), action.getData());
break;
case ADD:
committer.prepareAddPartition(action.getHdfsContext(), action.getIdentity(), action.getData());
break;
case INSERT_EXISTING:
committer.prepareInsertExistingPartition(action.getHdfsContext(), action.getIdentity(), action.getData());
break;
default:
throw new IllegalStateException("Unknown action type");
}
}
}
// Wait for all renames submitted for "INSERT_EXISTING" action to finish
committer.waitForAsyncRenames();
// At this point, all file system operations, whether asynchronously issued or not, have completed successfully.
// We are moving on to metastore operations now.
committer.executeAddTableOperations();
committer.executeAlterTableOperations();
committer.executeAlterPartitionOperations();
committer.executeAddPartitionOperations();
committer.executeUpdateStatisticsOperations();
}
catch (Throwable t) {
committer.cancelUnstartedAsyncRenames();
committer.undoUpdateStatisticsOperations();
committer.undoAddPartitionOperations();
committer.undoAddTableOperations();
committer.waitForAsyncRenamesSuppressThrowables();
// fileRenameFutures must all come back before any file system cleanups are carried out.
// Otherwise, files that should be deleted may be created after cleanup is done.
committer.executeCleanupTasksForAbort(declaredIntentionsToWrite);
committer.executeRenameTasksForAbort();
// Partition directory must be put back before relevant metastore operation can be undone
committer.undoAlterTableOperations();
committer.undoAlterPartitionOperations();
rollbackShared();
throw t;
}
try {
// After this line, operations are no longer reversible.
// The next section will deal with "dropping table/partition". Commit may still fail in
// this section. Even if commit fails, cleanups, instead of rollbacks, will be executed.
committer.executeIrreversibleMetastoreOperations();
// If control flow reached this point, this commit is considered successful no matter
// what happens later. The only kind of operations that haven't been carried out yet
// are cleanups.
// The program control flow will go to finally next. And cleanup will run because
// moveForwardInFinally has been set to false.
}
finally {
// In this method, all operations are best-effort clean up operations.
// If any operation fails, the error will be logged and ignored.
// Additionally, other clean up operations should still be attempted.
// Execute deletion tasks
committer.executeDeletionTasksForFinish();
// Clean up empty staging directories (that may recursively contain empty directories)
committer.deleteEmptyStagingDirectories(declaredIntentionsToWrite);
}
}
private class Committer
{
private final AtomicBoolean fileRenameCancelled = new AtomicBoolean(false);
private final List> fileRenameFutures = new ArrayList<>();
// File system
// For file system changes, only operations outside of writing paths (as specified in declared intentions to write)
// need to MOVE_BACKWARD tasks scheduled. Files in writing paths are handled by rollbackShared().
private final List deletionTasksForFinish = new ArrayList<>();
private final List cleanUpTasksForAbort = new ArrayList<>();
private final List renameTasksForAbort = new ArrayList<>();
// Metastore
private final List addTableOperations = new ArrayList<>();
private final List alterTableOperations = new ArrayList<>();
private final Map partitionAdders = new HashMap<>();
private final List alterPartitionOperations = new ArrayList<>();
private final List updateStatisticsOperations = new ArrayList<>();
private final List metastoreDeleteOperations = new ArrayList<>();
// Flag for better error message
private boolean deleteOnly = true;
private void prepareDropTable(HiveIdentity identity, SchemaTableName schemaTableName)
{
metastoreDeleteOperations.add(new IrreversibleMetastoreOperation(
format("drop table %s", schemaTableName),
() -> delegate.dropTable(identity, schemaTableName.getSchemaName(), schemaTableName.getTableName(), true)));
}
private void prepareAlterTable(HdfsContext hdfsContext, HiveIdentity identity, TableAndMore tableAndMore)
{
deleteOnly = false;
Table table = tableAndMore.getTable();
String targetLocation = table.getStorage().getLocation();
Table oldTable = delegate.getTable(identity, table.getDatabaseName(), table.getTableName())
.orElseThrow(() -> new PrestoException(TRANSACTION_CONFLICT, "The table that this transaction modified was deleted in another transaction. " + table.getSchemaTableName()));
String oldTableLocation = oldTable.getStorage().getLocation();
Path oldTablePath = new Path(oldTableLocation);
// Location of the old table and the new table can be different because we allow arbitrary directories through LocationService.
// If the location of the old table is the same as the location of the new table:
// * Rename the old data directory to a temporary path with a special suffix
// * Remember we will need to delete that directory at the end if transaction successfully commits
// * Remember we will need to undo the rename if transaction aborts
// Otherwise,
// * Remember we will need to delete the location of the old partition at the end if transaction successfully commits
if (targetLocation.equals(oldTableLocation)) {
String queryId = hdfsContext.getQueryId().orElseThrow(() -> new IllegalArgumentException("query ID not present"));
Path oldTableStagingPath = new Path(oldTablePath.getParent(), "_temp_" + oldTablePath.getName() + "_" + queryId);
renameDirectory(
hdfsContext,
hdfsEnvironment,
oldTablePath,
oldTableStagingPath,
() -> renameTasksForAbort.add(new DirectoryRenameTask(hdfsContext, oldTableStagingPath, oldTablePath)));
if (!skipDeletionForAlter) {
deletionTasksForFinish.add(new DirectoryDeletionTask(hdfsContext, oldTableStagingPath));
}
}
else {
if (!skipDeletionForAlter) {
deletionTasksForFinish.add(new DirectoryDeletionTask(hdfsContext, oldTablePath));
}
}
Path currentPath = tableAndMore.getCurrentLocation()
.orElseThrow(() -> new IllegalArgumentException("location should be present for alter table"));
Path targetPath = new Path(targetLocation);
if (!targetPath.equals(currentPath)) {
renameDirectory(
hdfsContext,
hdfsEnvironment,
currentPath,
targetPath,
() -> cleanUpTasksForAbort.add(new DirectoryCleanUpTask(hdfsContext, targetPath, true)));
}
// Partition alter must happen regardless of whether original and current location is the same
// because metadata might change: e.g. storage format, column types, etc
alterTableOperations.add(new AlterTableOperation(tableAndMore.getIdentity(), tableAndMore.getTable(), oldTable, tableAndMore.getPrincipalPrivileges()));
updateStatisticsOperations.add(new UpdateStatisticsOperation(
tableAndMore.getIdentity(),
table.getSchemaTableName(),
Optional.empty(),
tableAndMore.getStatisticsUpdate(),
false));
}
private void prepareAddTable(HdfsContext context, TableAndMore tableAndMore)
{
deleteOnly = false;
Table table = tableAndMore.getTable();
if (table.getTableType().equals(MANAGED_TABLE.name())) {
String targetLocation = table.getStorage().getLocation();
checkArgument(!targetLocation.isEmpty(), "target location is empty");
Optional currentPath = tableAndMore.getCurrentLocation();
Path targetPath = new Path(targetLocation);
if (table.getPartitionColumns().isEmpty() && currentPath.isPresent()) {
// CREATE TABLE AS SELECT unpartitioned table
if (targetPath.equals(currentPath.get())) {
// Target path and current path are the same. Therefore, directory move is not needed.
}
else {
renameDirectory(
context,
hdfsEnvironment,
currentPath.get(),
targetPath,
() -> cleanUpTasksForAbort.add(new DirectoryCleanUpTask(context, targetPath, true)));
}
}
else {
// CREATE TABLE AS SELECT partitioned table, or
// CREATE TABLE partitioned/unpartitioned table (without data)
if (pathExists(context, hdfsEnvironment, targetPath)) {
if (currentPath.isPresent() && currentPath.get().equals(targetPath)) {
// It is okay to skip directory creation when currentPath is equal to targetPath
// because the directory may have been created when creating partition directories.
// However, it is important to note that the two being equal does not guarantee
// a directory had been created.
}
else {
throw new PrestoException(
HIVE_PATH_ALREADY_EXISTS,
format("Unable to create directory %s: target directory already exists", targetPath));
}
}
else {
cleanUpTasksForAbort.add(new DirectoryCleanUpTask(context, targetPath, true));
createDirectory(context, hdfsEnvironment, targetPath);
}
}
}
addTableOperations.add(new CreateTableOperation(tableAndMore.getIdentity(), table, tableAndMore.getPrincipalPrivileges(), tableAndMore.isIgnoreExisting()));
if (!isPrestoView(table)) {
updateStatisticsOperations.add(new UpdateStatisticsOperation(
tableAndMore.getIdentity(),
table.getSchemaTableName(),
Optional.empty(),
tableAndMore.getStatisticsUpdate(),
false));
}
}
private void prepareInsertExistingTable(HdfsContext context, TableAndMore tableAndMore)
{
deleteOnly = false;
Table table = tableAndMore.getTable();
Path targetPath = new Path(table.getStorage().getLocation());
Path currentPath = tableAndMore.getCurrentLocation().get();
cleanUpTasksForAbort.add(new DirectoryCleanUpTask(context, targetPath, false));
if (!targetPath.equals(currentPath)) {
asyncRename(hdfsEnvironment, renameExecutor, fileRenameCancelled, fileRenameFutures, context, currentPath, targetPath, tableAndMore.getFileNames().get());
}
updateStatisticsOperations.add(new UpdateStatisticsOperation(
tableAndMore.getIdentity(),
table.getSchemaTableName(),
Optional.empty(),
tableAndMore.getStatisticsUpdate(),
true));
}
private void prepareDropPartition(HiveIdentity identity, SchemaTableName schemaTableName, List partitionValues, boolean deleteData)
{
metastoreDeleteOperations.add(new IrreversibleMetastoreOperation(
format("drop partition %s.%s %s", schemaTableName.getSchemaName(), schemaTableName.getTableName(), partitionValues),
() -> delegate.dropPartition(identity, schemaTableName.getSchemaName(), schemaTableName.getTableName(), partitionValues, deleteData)));
}
private void prepareAlterPartition(HdfsContext hdfsContext, HiveIdentity identity, PartitionAndMore partitionAndMore)
{
deleteOnly = false;
Partition partition = partitionAndMore.getPartition();
String targetLocation = partition.getStorage().getLocation();
Optional oldPartition = delegate.getPartition(identity, partition.getDatabaseName(), partition.getTableName(), partition.getValues());
if (oldPartition.isEmpty()) {
throw new PrestoException(
TRANSACTION_CONFLICT,
format("The partition that this transaction modified was deleted in another transaction. %s %s", partition.getTableName(), partition.getValues()));
}
String partitionName = getPartitionName(identity, partition.getDatabaseName(), partition.getTableName(), partition.getValues());
PartitionStatistics oldPartitionStatistics = getExistingPartitionStatistics(identity, partition, partitionName);
String oldPartitionLocation = oldPartition.get().getStorage().getLocation();
Path oldPartitionPath = new Path(oldPartitionLocation);
// Location of the old partition and the new partition can be different because we allow arbitrary directories through LocationService.
// If the location of the old partition is the same as the location of the new partition:
// * Rename the old data directory to a temporary path with a special suffix
// * Remember we will need to delete that directory at the end if transaction successfully commits
// * Remember we will need to undo the rename if transaction aborts
// Otherwise,
// * Remember we will need to delete the location of the old partition at the end if transaction successfully commits
if (targetLocation.equals(oldPartitionLocation)) {
String queryId = hdfsContext.getQueryId().orElseThrow(() -> new IllegalArgumentException("query ID not present"));
Path oldPartitionStagingPath = new Path(oldPartitionPath.getParent(), "_temp_" + oldPartitionPath.getName() + "_" + queryId);
renameDirectory(
hdfsContext,
hdfsEnvironment,
oldPartitionPath,
oldPartitionStagingPath,
() -> renameTasksForAbort.add(new DirectoryRenameTask(hdfsContext, oldPartitionStagingPath, oldPartitionPath)));
if (!skipDeletionForAlter) {
deletionTasksForFinish.add(new DirectoryDeletionTask(hdfsContext, oldPartitionStagingPath));
}
}
else {
if (!skipDeletionForAlter) {
deletionTasksForFinish.add(new DirectoryDeletionTask(hdfsContext, oldPartitionPath));
}
}
Path currentPath = partitionAndMore.getCurrentLocation();
Path targetPath = new Path(targetLocation);
if (!targetPath.equals(currentPath)) {
renameDirectory(
hdfsContext,
hdfsEnvironment,
currentPath,
targetPath,
() -> cleanUpTasksForAbort.add(new DirectoryCleanUpTask(hdfsContext, targetPath, true)));
}
// Partition alter must happen regardless of whether original and current location is the same
// because metadata might change: e.g. storage format, column types, etc
alterPartitionOperations.add(new AlterPartitionOperation(
partitionAndMore.getIdentity(),
new PartitionWithStatistics(partition, partitionName, partitionAndMore.getStatisticsUpdate()),
new PartitionWithStatistics(oldPartition.get(), partitionName, oldPartitionStatistics)));
}
private PartitionStatistics getExistingPartitionStatistics(HiveIdentity identity, Partition partition, String partitionName)
{
try {
PartitionStatistics statistics = delegate.getPartitionStatistics(identity, partition.getDatabaseName(), partition.getTableName(), ImmutableSet.of(partitionName))
.get(partitionName);
if (statistics == null) {
throw new PrestoException(
TRANSACTION_CONFLICT,
format("The partition that this transaction modified was deleted in another transaction. %s %s", partition.getTableName(), partition.getValues()));
}
return statistics;
}
catch (PrestoException e) {
if (e.getErrorCode().equals(HIVE_CORRUPTED_COLUMN_STATISTICS.toErrorCode())) {
log.warn(
e,
"Corrupted statistics found when altering partition. Table: %s.%s. Partition: %s",
partition.getDatabaseName(),
partition.getTableName(),
partition.getValues());
return PartitionStatistics.empty();
}
throw e;
}
}
private void prepareAddPartition(HdfsContext hdfsContext, HiveIdentity identity, PartitionAndMore partitionAndMore)
{
deleteOnly = false;
Partition partition = partitionAndMore.getPartition();
String targetLocation = partition.getStorage().getLocation();
Path currentPath = partitionAndMore.getCurrentLocation();
Path targetPath = new Path(targetLocation);
PartitionAdder partitionAdder = partitionAdders.computeIfAbsent(
partition.getSchemaTableName(),
ignored -> new PartitionAdder(partitionAndMore.getIdentity(), partition.getDatabaseName(), partition.getTableName(), delegate, PARTITION_COMMIT_BATCH_SIZE));
if (pathExists(hdfsContext, hdfsEnvironment, currentPath)) {
if (!targetPath.equals(currentPath)) {
renameDirectory(
hdfsContext,
hdfsEnvironment,
currentPath,
targetPath,
() -> cleanUpTasksForAbort.add(new DirectoryCleanUpTask(hdfsContext, targetPath, true)));
}
}
else {
cleanUpTasksForAbort.add(new DirectoryCleanUpTask(hdfsContext, targetPath, true));
createDirectory(hdfsContext, hdfsEnvironment, targetPath);
}
String partitionName = getPartitionName(identity, partition.getDatabaseName(), partition.getTableName(), partition.getValues());
partitionAdder.addPartition(new PartitionWithStatistics(partition, partitionName, partitionAndMore.getStatisticsUpdate()));
}
private void prepareInsertExistingPartition(HdfsContext hdfsContext, HiveIdentity identity, PartitionAndMore partitionAndMore)
{
deleteOnly = false;
Partition partition = partitionAndMore.getPartition();
Path targetPath = new Path(partition.getStorage().getLocation());
Path currentPath = partitionAndMore.getCurrentLocation();
cleanUpTasksForAbort.add(new DirectoryCleanUpTask(hdfsContext, targetPath, false));
if (!targetPath.equals(currentPath)) {
asyncRename(hdfsEnvironment, renameExecutor, fileRenameCancelled, fileRenameFutures, hdfsContext, currentPath, targetPath, partitionAndMore.getFileNames());
}
updateStatisticsOperations.add(new UpdateStatisticsOperation(
partitionAndMore.getIdentity(),
partition.getSchemaTableName(),
Optional.of(getPartitionName(identity, partition.getDatabaseName(), partition.getTableName(), partition.getValues())),
partitionAndMore.getStatisticsUpdate(),
true));
}
private void executeCleanupTasksForAbort(Collection declaredIntentionsToWrite)
{
Set queryIds = declaredIntentionsToWrite.stream()
.map(DeclaredIntentionToWrite::getQueryId)
.collect(toImmutableSet());
for (DirectoryCleanUpTask cleanUpTask : cleanUpTasksForAbort) {
recursiveDeleteFilesAndLog(cleanUpTask.getContext(), cleanUpTask.getPath(), queryIds, cleanUpTask.isDeleteEmptyDirectory(), "temporary directory commit abort");
}
}
private void executeDeletionTasksForFinish()
{
for (DirectoryDeletionTask deletionTask : deletionTasksForFinish) {
if (!deleteRecursivelyIfExists(deletionTask.getContext(), hdfsEnvironment, deletionTask.getPath())) {
logCleanupFailure("Error deleting directory %s", deletionTask.getPath().toString());
}
}
}
private void executeRenameTasksForAbort()
{
for (DirectoryRenameTask directoryRenameTask : renameTasksForAbort) {
try {
// Ignore the task if the source directory doesn't exist.
// This is probably because the original rename that we are trying to undo here never succeeded.
if (pathExists(directoryRenameTask.getContext(), hdfsEnvironment, directoryRenameTask.getRenameFrom())) {
renameDirectory(directoryRenameTask.getContext(), hdfsEnvironment, directoryRenameTask.getRenameFrom(), directoryRenameTask.getRenameTo(), () -> {});
}
}
catch (Throwable throwable) {
logCleanupFailure(throwable, "failed to undo rename of partition directory: %s to %s", directoryRenameTask.getRenameFrom(), directoryRenameTask.getRenameTo());
}
}
}
private void deleteEmptyStagingDirectories(List declaredIntentionsToWrite)
{
for (DeclaredIntentionToWrite declaredIntentionToWrite : declaredIntentionsToWrite) {
if (declaredIntentionToWrite.getMode() != WriteMode.STAGE_AND_MOVE_TO_TARGET_DIRECTORY) {
continue;
}
Path path = declaredIntentionToWrite.getRootPath();
recursiveDeleteFilesAndLog(declaredIntentionToWrite.getHdfsContext(), path, ImmutableSet.of(), true, "staging directory cleanup");
}
}
private void waitForAsyncRenames()
{
for (CompletableFuture fileRenameFuture : fileRenameFutures) {
getFutureValue(fileRenameFuture, PrestoException.class);
}
}
private void waitForAsyncRenamesSuppressThrowables()
{
for (CompletableFuture future : fileRenameFutures) {
try {
future.get();
}
catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
catch (Throwable t) {
// ignore
}
}
}
private void cancelUnstartedAsyncRenames()
{
fileRenameCancelled.set(true);
}
private void executeAddTableOperations()
{
for (CreateTableOperation addTableOperation : addTableOperations) {
addTableOperation.run(delegate);
}
}
private void executeAlterTableOperations()
{
for (AlterTableOperation alterTableOperation : alterTableOperations) {
alterTableOperation.run(delegate);
}
}
private void executeAlterPartitionOperations()
{
for (AlterPartitionOperation alterPartitionOperation : alterPartitionOperations) {
alterPartitionOperation.run(delegate);
}
}
private void executeAddPartitionOperations()
{
for (PartitionAdder partitionAdder : partitionAdders.values()) {
partitionAdder.execute();
}
}
private void executeUpdateStatisticsOperations()
{
for (UpdateStatisticsOperation operation : updateStatisticsOperations) {
operation.run(delegate);
}
}
private void undoAddPartitionOperations()
{
for (PartitionAdder partitionAdder : partitionAdders.values()) {
List> partitionsFailedToRollback = partitionAdder.rollback();
if (!partitionsFailedToRollback.isEmpty()) {
logCleanupFailure("Failed to rollback: add_partition for partitions %s.%s %s",
partitionAdder.getSchemaName(),
partitionAdder.getTableName(),
partitionsFailedToRollback.stream());
}
}
}
private void undoAddTableOperations()
{
for (CreateTableOperation addTableOperation : addTableOperations) {
try {
addTableOperation.undo(delegate);
}
catch (Throwable throwable) {
logCleanupFailure(throwable, "failed to rollback: %s", addTableOperation.getDescription());
}
}
}
private void undoAlterTableOperations()
{
for (AlterTableOperation alterTableOperation : alterTableOperations) {
try {
alterTableOperation.undo(delegate);
}
catch (Throwable throwable) {
logCleanupFailure(throwable, "failed to rollback: %s", alterTableOperation.getDescription());
}
}
}
private void undoAlterPartitionOperations()
{
for (AlterPartitionOperation alterPartitionOperation : alterPartitionOperations) {
try {
alterPartitionOperation.undo(delegate);
}
catch (Throwable throwable) {
logCleanupFailure(throwable, "failed to rollback: %s", alterPartitionOperation.getDescription());
}
}
}
private void undoUpdateStatisticsOperations()
{
for (UpdateStatisticsOperation operation : updateStatisticsOperations) {
try {
operation.undo(delegate);
}
catch (Throwable throwable) {
logCleanupFailure(throwable, "failed to rollback: %s", operation.getDescription());
}
}
}
private void executeIrreversibleMetastoreOperations()
{
List failedIrreversibleOperationDescriptions = new ArrayList<>();
List suppressedExceptions = new ArrayList<>();
AtomicBoolean anySucceeded = new AtomicBoolean(false);
ImmutableList.Builder> dropFutures = ImmutableList.builder();
for (IrreversibleMetastoreOperation irreversibleMetastoreOperation : metastoreDeleteOperations) {
dropFutures.add(CompletableFuture.runAsync(() -> {
try {
irreversibleMetastoreOperation.run();
anySucceeded.set(true);
}
catch (Throwable t) {
synchronized (failedIrreversibleOperationDescriptions) {
failedIrreversibleOperationDescriptions.add(irreversibleMetastoreOperation.getDescription());
// A limit is needed to avoid having a huge exception object. 5 was chosen arbitrarily.
if (suppressedExceptions.size() < 5) {
suppressedExceptions.add(t);
}
}
}
}, dropExecutor));
}
for (CompletableFuture dropFuture : dropFutures.build()) {
// none of the futures should fail because all exceptions are being handled explicitly
getFutureValue(dropFuture);
}
if (!suppressedExceptions.isEmpty()) {
StringBuilder message = new StringBuilder();
if (deleteOnly && !anySucceeded.get()) {
message.append("The following metastore delete operations failed: ");
}
else {
message.append("The transaction didn't commit cleanly. All operations other than the following delete operations were completed: ");
}
Joiner.on("; ").appendTo(message, failedIrreversibleOperationDescriptions);
PrestoException prestoException = new PrestoException(HIVE_METASTORE_ERROR, message.toString());
suppressedExceptions.forEach(prestoException::addSuppressed);
throw prestoException;
}
}
}
@GuardedBy("this")
private void rollbackShared()
{
checkHoldsLock();
for (DeclaredIntentionToWrite declaredIntentionToWrite : declaredIntentionsToWrite) {
switch (declaredIntentionToWrite.getMode()) {
case STAGE_AND_MOVE_TO_TARGET_DIRECTORY:
case DIRECT_TO_TARGET_NEW_DIRECTORY:
// For STAGE_AND_MOVE_TO_TARGET_DIRECTORY, there is no need to cleanup the target directory as
// it will only be written to during the commit call and the commit call cleans up after failures.
if ((declaredIntentionToWrite.getMode() == DIRECT_TO_TARGET_NEW_DIRECTORY) && skipTargetCleanupOnRollback) {
break;
}
Path rootPath = declaredIntentionToWrite.getRootPath();
// In the case of DIRECT_TO_TARGET_NEW_DIRECTORY, if the directory is not guaranteed to be unique
// for the query, it is possible that another query or compute engine may see the directory, wrote
// data to it, and exported it through metastore. Therefore it may be argued that cleanup of staging
// directories must be carried out conservatively. To be safe, we only delete files that start or
// end with the query IDs in this transaction.
recursiveDeleteFilesAndLog(
declaredIntentionToWrite.getHdfsContext(),
rootPath,
ImmutableSet.of(declaredIntentionToWrite.getQueryId()),
true,
format("staging/target_new directory rollback for table %s", declaredIntentionToWrite.getSchemaTableName()));
break;
case DIRECT_TO_TARGET_EXISTING_DIRECTORY:
Set pathsToClean = new HashSet<>();
// Check the base directory of the declared intention
// * existing partition may also be in this directory
// * this is where new partitions are created
Path baseDirectory = declaredIntentionToWrite.getRootPath();
pathsToClean.add(baseDirectory);
HiveIdentity identity = declaredIntentionToWrite.getIdentity();
SchemaTableName schemaTableName = declaredIntentionToWrite.getSchemaTableName();
Optional
table = delegate.getTable(identity, schemaTableName.getSchemaName(), schemaTableName.getTableName());
if (table.isPresent()) {
// check every existing partition that is outside for the base directory
List partitionColumns = table.get().getPartitionColumns();
if (!partitionColumns.isEmpty()) {
List partitionColumnNames = partitionColumns.stream()
.map(Column::getName)
.collect(toImmutableList());
List partitionNames = delegate.getPartitionNamesByFilter(
identity, schemaTableName.getSchemaName(), schemaTableName.getTableName(), partitionColumnNames, TupleDomain.all())
.orElse(ImmutableList.of());
for (List partitionNameBatch : Iterables.partition(partitionNames, 10)) {
Collection> partitions = delegate.getPartitionsByNames(identity, schemaTableName.getSchemaName(), schemaTableName.getTableName(), partitionNameBatch).values();
partitions.stream()
.filter(Optional::isPresent)
.map(Optional::get)
.map(partition -> partition.getStorage().getLocation())
.map(Path::new)
.filter(path -> !isSameOrParent(baseDirectory, path))
.forEach(pathsToClean::add);
}
}
}
else {
logCleanupFailure(
"Error rolling back write to table %s.%s. Data directory may contain temporary data. Table was dropped in another transaction.",
schemaTableName.getSchemaName(),
schemaTableName.getTableName());
}
// delete any file that starts or ends with the query ID
for (Path path : pathsToClean) {
// TODO: It is a known deficiency that some empty directory does not get cleaned up in S3.
// We cannot delete any of the directories here since we do not know who created them.
recursiveDeleteFilesAndLog(
declaredIntentionToWrite.getHdfsContext(),
path,
ImmutableSet.of(declaredIntentionToWrite.getQueryId()),
false,
format("target_existing directory rollback for table %s", schemaTableName));
}
break;
default:
throw new UnsupportedOperationException("Unknown write mode");
}
}
}
@VisibleForTesting
public synchronized void testOnlyCheckIsReadOnly()
{
if (state != State.EMPTY) {
throw new AssertionError("Test did not commit or rollback");
}
}
@VisibleForTesting
public void testOnlyThrowOnCleanupFailures()
{
throwOnCleanupFailure = true;
}
@GuardedBy("this")
private void checkReadable()
{
checkHoldsLock();
switch (state) {
case EMPTY:
case SHARED_OPERATION_BUFFERED:
return;
case EXCLUSIVE_OPERATION_BUFFERED:
throw new PrestoException(NOT_SUPPORTED, "Unsupported combination of operations in a single transaction");
case FINISHED:
throw new IllegalStateException("Tried to access metastore after transaction has been committed/aborted");
}
}
@GuardedBy("this")
private void setShared()
{
checkHoldsLock();
checkReadable();
state = State.SHARED_OPERATION_BUFFERED;
}
@GuardedBy("this")
private void setExclusive(ExclusiveOperation exclusiveOperation)
{
checkHoldsLock();
if (state != State.EMPTY) {
throw new PrestoException(NOT_SUPPORTED, "Unsupported combination of operations in a single transaction");
}
state = State.EXCLUSIVE_OPERATION_BUFFERED;
bufferedExclusiveOperation = exclusiveOperation;
}
@GuardedBy("this")
private void checkNoPartitionAction(String databaseName, String tableName)
{
checkHoldsLock();
Map, Action> partitionActionsOfTable = partitionActions.get(new SchemaTableName(databaseName, tableName));
if (partitionActionsOfTable != null && !partitionActionsOfTable.isEmpty()) {
throw new PrestoException(NOT_SUPPORTED, "Cannot make schema changes to a table/view with modified partitions in the same transaction");
}
}
private static boolean isSameOrParent(Path parent, Path child)
{
int parentDepth = parent.depth();
int childDepth = child.depth();
if (parentDepth > childDepth) {
return false;
}
for (int i = childDepth; i > parentDepth; i--) {
child = child.getParent();
}
return parent.equals(child);
}
private void logCleanupFailure(String format, Object... args)
{
if (throwOnCleanupFailure) {
throw new RuntimeException(format(format, args));
}
log.warn(format, args);
}
private void logCleanupFailure(Throwable t, String format, Object... args)
{
if (throwOnCleanupFailure) {
throw new RuntimeException(format(format, args), t);
}
log.warn(t, format, args);
}
private static void asyncRename(
HdfsEnvironment hdfsEnvironment,
Executor executor,
AtomicBoolean cancelled,
List> fileRenameFutures,
HdfsContext context,
Path currentPath,
Path targetPath,
List fileNames)
{
FileSystem fileSystem;
try {
fileSystem = hdfsEnvironment.getFileSystem(context, currentPath);
}
catch (IOException e) {
throw new PrestoException(HIVE_FILESYSTEM_ERROR, format("Error moving data files to final location. Error listing directory %s", currentPath), e);
}
for (String fileName : fileNames) {
Path source = new Path(currentPath, fileName);
Path target = new Path(targetPath, fileName);
fileRenameFutures.add(CompletableFuture.runAsync(() -> {
if (cancelled.get()) {
return;
}
try {
if (fileSystem.exists(target) || !fileSystem.rename(source, target)) {
throw new PrestoException(HIVE_FILESYSTEM_ERROR, format("Error moving data files from %s to final location %s", source, target));
}
}
catch (IOException e) {
throw new PrestoException(HIVE_FILESYSTEM_ERROR, format("Error moving data files from %s to final location %s", source, target), e);
}
}, executor));
}
}
private void recursiveDeleteFilesAndLog(HdfsContext context, Path directory, Set queryIds, boolean deleteEmptyDirectories, String reason)
{
RecursiveDeleteResult recursiveDeleteResult = recursiveDeleteFiles(
hdfsEnvironment,
context,
directory,
queryIds,
deleteEmptyDirectories);
if (!recursiveDeleteResult.getNotDeletedEligibleItems().isEmpty()) {
logCleanupFailure(
"Error deleting directory %s for %s. Some eligible items cannot be deleted: %s.",
directory.toString(),
reason,
recursiveDeleteResult.getNotDeletedEligibleItems());
}
else if (deleteEmptyDirectories && !recursiveDeleteResult.isDirectoryNoLongerExists()) {
logCleanupFailure(
"Error deleting directory %s for %s. Cannot delete the directory.",
directory.toString(),
reason);
}
}
/**
* Attempt to recursively remove eligible files and/or directories in {@code directory}.
*
* When {@code queryIds} is not present, all files (but not necessarily directories) will be
* ineligible. If all files shall be deleted, you can use an empty string as {@code queryIds}.
*
* When {@code deleteEmptySubDirectory} is true, any empty directory (including directories that
* were originally empty, and directories that become empty after files prefixed or suffixed with
* {@code queryIds} are deleted) will be eligible.
*
* This method will not delete anything that's neither a directory nor a file.
*
* @param queryIds prefix or suffix of files that should be deleted
* @param deleteEmptyDirectories whether empty directories should be deleted
*/
private static RecursiveDeleteResult recursiveDeleteFiles(HdfsEnvironment hdfsEnvironment, HdfsContext context, Path directory, Set queryIds, boolean deleteEmptyDirectories)
{
FileSystem fileSystem;
try {
fileSystem = hdfsEnvironment.getFileSystem(context, directory);
if (!fileSystem.exists(directory)) {
return new RecursiveDeleteResult(true, ImmutableList.of());
}
}
catch (IOException e) {
ImmutableList.Builder notDeletedItems = ImmutableList.builder();
notDeletedItems.add(directory.toString() + "/**");
return new RecursiveDeleteResult(false, notDeletedItems.build());
}
return doRecursiveDeleteFiles(fileSystem, directory, queryIds, deleteEmptyDirectories);
}
private static RecursiveDeleteResult doRecursiveDeleteFiles(FileSystem fileSystem, Path directory, Set queryIds, boolean deleteEmptyDirectories)
{
// don't delete hidden presto directories
if (directory.getName().startsWith(".presto")) {
return new RecursiveDeleteResult(false, ImmutableList.of());
}
FileStatus[] allFiles;
try {
allFiles = fileSystem.listStatus(directory);
}
catch (IOException e) {
ImmutableList.Builder notDeletedItems = ImmutableList.builder();
notDeletedItems.add(directory.toString() + "/**");
return new RecursiveDeleteResult(false, notDeletedItems.build());
}
boolean allDescendentsDeleted = true;
ImmutableList.Builder notDeletedEligibleItems = ImmutableList.builder();
for (FileStatus fileStatus : allFiles) {
if (fileStatus.isFile()) {
Path filePath = fileStatus.getPath();
String fileName = filePath.getName();
boolean eligible = false;
// never delete presto dot files
if (!fileName.startsWith(".presto")) {
eligible = queryIds.stream().anyMatch(id -> fileName.startsWith(id) || fileName.endsWith(id));
}
if (eligible) {
if (!deleteIfExists(fileSystem, filePath, false)) {
allDescendentsDeleted = false;
notDeletedEligibleItems.add(filePath.toString());
}
}
else {
allDescendentsDeleted = false;
}
}
else if (fileStatus.isDirectory()) {
RecursiveDeleteResult subResult = doRecursiveDeleteFiles(fileSystem, fileStatus.getPath(), queryIds, deleteEmptyDirectories);
if (!subResult.isDirectoryNoLongerExists()) {
allDescendentsDeleted = false;
}
if (!subResult.getNotDeletedEligibleItems().isEmpty()) {
notDeletedEligibleItems.addAll(subResult.getNotDeletedEligibleItems());
}
}
else {
allDescendentsDeleted = false;
notDeletedEligibleItems.add(fileStatus.getPath().toString());
}
}
if (allDescendentsDeleted && deleteEmptyDirectories) {
verify(notDeletedEligibleItems.build().isEmpty());
if (!deleteIfExists(fileSystem, directory, false)) {
return new RecursiveDeleteResult(false, ImmutableList.of(directory.toString() + "/"));
}
return new RecursiveDeleteResult(true, ImmutableList.of());
}
return new RecursiveDeleteResult(false, notDeletedEligibleItems.build());
}
/**
* Attempts to remove the file or empty directory.
*
* @return true if the location no longer exists
*/
private static boolean deleteIfExists(FileSystem fileSystem, Path path, boolean recursive)
{
try {
// attempt to delete the path
if (fileSystem.delete(path, recursive)) {
return true;
}
// delete failed
// check if path still exists
return !fileSystem.exists(path);
}
catch (FileNotFoundException ignored) {
// path was already removed or never existed
return true;
}
catch (IOException ignored) {
}
return false;
}
/**
* Attempts to remove the file or empty directory.
*
* @return true if the location no longer exists
*/
private static boolean deleteRecursivelyIfExists(HdfsContext context, HdfsEnvironment hdfsEnvironment, Path path)
{
FileSystem fileSystem;
try {
fileSystem = hdfsEnvironment.getFileSystem(context, path);
}
catch (IOException ignored) {
return false;
}
return deleteIfExists(fileSystem, path, true);
}
private static void renameDirectory(HdfsContext context, HdfsEnvironment hdfsEnvironment, Path source, Path target, Runnable runWhenPathDoesntExist)
{
if (pathExists(context, hdfsEnvironment, target)) {
throw new PrestoException(HIVE_PATH_ALREADY_EXISTS,
format("Unable to rename from %s to %s: target directory already exists", source, target));
}
if (!pathExists(context, hdfsEnvironment, target.getParent())) {
createDirectory(context, hdfsEnvironment, target.getParent());
}
// The runnable will assume that if rename fails, it will be okay to delete the directory (if the directory is empty).
// This is not technically true because a race condition still exists.
runWhenPathDoesntExist.run();
try {
if (!hdfsEnvironment.getFileSystem(context, source).rename(source, target)) {
throw new PrestoException(HIVE_FILESYSTEM_ERROR, format("Failed to rename %s to %s: rename returned false", source, target));
}
}
catch (IOException e) {
throw new PrestoException(HIVE_FILESYSTEM_ERROR, format("Failed to rename %s to %s", source, target), e);
}
}
private static Optional getPrestoQueryId(Table table)
{
return Optional.ofNullable(table.getParameters().get(PRESTO_QUERY_ID_NAME));
}
private static Optional getPrestoQueryId(Partition partition)
{
return Optional.ofNullable(partition.getParameters().get(PRESTO_QUERY_ID_NAME));
}
private void checkHoldsLock()
{
// This method serves a similar purpose at runtime as GuardedBy on method serves during static analysis.
// This method should not have significant performance impact. If it does, it may be reasonably to remove this method.
// This intentionally does not use checkState.
if (!Thread.holdsLock(this)) {
throw new IllegalStateException(format("Thread must hold a lock on the %s", getClass().getSimpleName()));
}
}
private enum State
{
EMPTY,
SHARED_OPERATION_BUFFERED,
EXCLUSIVE_OPERATION_BUFFERED,
FINISHED,
}
private enum ActionType
{
DROP,
DROP_PRESERVE_DATA,
ADD,
ALTER,
INSERT_EXISTING
}
private enum TableSource
{
CREATED_IN_THIS_TRANSACTION,
PRE_EXISTING_TABLE,
// RECREATED_IN_THIS_TRANSACTION is a possible case, but it is not supported with the current implementation
}
public static class Action
{
private final ActionType type;
private final T data;
private final HdfsContext hdfsContext;
private final HiveIdentity identity;
public Action(ActionType type, T data, HdfsContext hdfsContext, HiveIdentity identity)
{
this.type = requireNonNull(type, "type is null");
if (type == ActionType.DROP || type == ActionType.DROP_PRESERVE_DATA) {
checkArgument(data == null, "data is not null");
}
else {
requireNonNull(data, "data is null");
}
this.data = data;
this.hdfsContext = requireNonNull(hdfsContext, "hdfsContext is null");
this.identity = requireNonNull(identity, "identity is null");
}
public ActionType getType()
{
return type;
}
public T getData()
{
checkState(type != ActionType.DROP);
return data;
}
public HdfsContext getHdfsContext()
{
return hdfsContext;
}
public HiveIdentity getIdentity()
{
return identity;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("type", type)
.add("data", data)
.toString();
}
}
private static class TableAndMore
{
private final Table table;
private final HiveIdentity identity;
private final Optional principalPrivileges;
private final Optional currentLocation; // unpartitioned table only
private final Optional> fileNames;
private final boolean ignoreExisting;
private final PartitionStatistics statistics;
private final PartitionStatistics statisticsUpdate;
public TableAndMore(
Table table,
HiveIdentity identity,
Optional principalPrivileges,
Optional currentLocation,
Optional> fileNames,
boolean ignoreExisting,
PartitionStatistics statistics,
PartitionStatistics statisticsUpdate)
{
this.table = requireNonNull(table, "table is null");
this.identity = requireNonNull(identity, "identity is null");
this.principalPrivileges = requireNonNull(principalPrivileges, "principalPrivileges is null");
this.currentLocation = requireNonNull(currentLocation, "currentLocation is null");
this.fileNames = requireNonNull(fileNames, "fileNames is null");
this.ignoreExisting = ignoreExisting;
this.statistics = requireNonNull(statistics, "statistics is null");
this.statisticsUpdate = requireNonNull(statisticsUpdate, "statisticsUpdate is null");
checkArgument(!table.getStorage().getLocation().isEmpty() || currentLocation.isEmpty(), "currentLocation cannot be supplied for table without location");
checkArgument(fileNames.isEmpty() || currentLocation.isPresent(), "fileNames can be supplied only when currentLocation is supplied");
}
public boolean isIgnoreExisting()
{
return ignoreExisting;
}
public Table getTable()
{
return table;
}
public HiveIdentity getIdentity()
{
return identity;
}
public PrincipalPrivileges getPrincipalPrivileges()
{
checkState(principalPrivileges.isPresent());
return principalPrivileges.get();
}
public Optional getCurrentLocation()
{
return currentLocation;
}
public Optional> getFileNames()
{
return fileNames;
}
public PartitionStatistics getStatistics()
{
return statistics;
}
public PartitionStatistics getStatisticsUpdate()
{
return statisticsUpdate;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("table", table)
.add("principalPrivileges", principalPrivileges)
.add("currentLocation", currentLocation)
.add("fileNames", fileNames)
.add("ignoreExisting", ignoreExisting)
.add("statistics", statistics)
.add("statisticsUpdate", statisticsUpdate)
.toString();
}
}
private static class PartitionAndMore
{
private final HiveIdentity identity;
private final Partition partition;
private final Path currentLocation;
private final Optional> fileNames;
private final PartitionStatistics statistics;
private final PartitionStatistics statisticsUpdate;
public PartitionAndMore(HiveIdentity identity, Partition partition, Path currentLocation, Optional> fileNames, PartitionStatistics statistics, PartitionStatistics statisticsUpdate)
{
this.identity = requireNonNull(identity, "identity is null");
this.partition = requireNonNull(partition, "partition is null");
this.currentLocation = requireNonNull(currentLocation, "currentLocation is null");
this.fileNames = requireNonNull(fileNames, "fileNames is null");
this.statistics = requireNonNull(statistics, "statistics is null");
this.statisticsUpdate = requireNonNull(statisticsUpdate, "statisticsUpdate is null");
}
public HiveIdentity getIdentity()
{
return identity;
}
public Partition getPartition()
{
return partition;
}
public Path getCurrentLocation()
{
return currentLocation;
}
public List getFileNames()
{
checkState(fileNames.isPresent());
return fileNames.get();
}
public PartitionStatistics getStatistics()
{
return statistics;
}
public PartitionStatistics getStatisticsUpdate()
{
return statisticsUpdate;
}
public Partition getAugmentedPartitionForInTransactionRead()
{
// This method augments the location field of the partition to the staging location.
// This way, if the partition is accessed in an ongoing transaction, staged data
// can be found and accessed.
Partition partition = this.partition;
String currentLocation = this.currentLocation.toString();
if (!currentLocation.equals(partition.getStorage().getLocation())) {
partition = Partition.builder(partition)
.withStorage(storage -> storage.setLocation(currentLocation))
.build();
}
return partition;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("partition", partition)
.add("currentLocation", currentLocation)
.add("fileNames", fileNames)
.toString();
}
}
private static class DeclaredIntentionToWrite
{
private final WriteMode mode;
private final HdfsContext hdfsContext;
private final HiveIdentity identity;
private final String queryId;
private final Path rootPath;
private final SchemaTableName schemaTableName;
public DeclaredIntentionToWrite(WriteMode mode, HdfsContext hdfsContext, HiveIdentity identity, String queryId, Path stagingPathRoot, SchemaTableName schemaTableName)
{
this.mode = requireNonNull(mode, "mode is null");
this.hdfsContext = requireNonNull(hdfsContext, "hdfsContext is null");
this.identity = requireNonNull(identity, "identity is null");
this.queryId = requireNonNull(queryId, "queryId is null");
this.rootPath = requireNonNull(stagingPathRoot, "stagingPathRoot is null");
this.schemaTableName = requireNonNull(schemaTableName, "schemaTableName is null");
}
public WriteMode getMode()
{
return mode;
}
public HdfsContext getHdfsContext()
{
return hdfsContext;
}
public HiveIdentity getIdentity()
{
return identity;
}
public String getQueryId()
{
return queryId;
}
public Path getRootPath()
{
return rootPath;
}
public SchemaTableName getSchemaTableName()
{
return schemaTableName;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("mode", mode)
.add("hdfsContext", hdfsContext)
.add("identity", identity)
.add("queryId", queryId)
.add("rootPath", rootPath)
.add("schemaTableName", schemaTableName)
.toString();
}
}
private static class DirectoryCleanUpTask
{
private final HdfsContext context;
private final Path path;
private final boolean deleteEmptyDirectory;
public DirectoryCleanUpTask(HdfsContext context, Path path, boolean deleteEmptyDirectory)
{
this.context = context;
this.path = path;
this.deleteEmptyDirectory = deleteEmptyDirectory;
}
public HdfsContext getContext()
{
return context;
}
public Path getPath()
{
return path;
}
public boolean isDeleteEmptyDirectory()
{
return deleteEmptyDirectory;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("context", context)
.add("path", path)
.add("deleteEmptyDirectory", deleteEmptyDirectory)
.toString();
}
}
private static class DirectoryDeletionTask
{
private final HdfsContext context;
private final Path path;
public DirectoryDeletionTask(HdfsContext context, Path path)
{
this.context = context;
this.path = path;
}
public HdfsContext getContext()
{
return context;
}
public Path getPath()
{
return path;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("context", context)
.add("path", path)
.toString();
}
}
private static class DirectoryRenameTask
{
private final HdfsContext context;
private final Path renameFrom;
private final Path renameTo;
public DirectoryRenameTask(HdfsContext context, Path renameFrom, Path renameTo)
{
this.context = requireNonNull(context, "context is null");
this.renameFrom = requireNonNull(renameFrom, "renameFrom is null");
this.renameTo = requireNonNull(renameTo, "renameTo is null");
}
public HdfsContext getContext()
{
return context;
}
public Path getRenameFrom()
{
return renameFrom;
}
public Path getRenameTo()
{
return renameTo;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("context", context)
.add("renameFrom", renameFrom)
.add("renameTo", renameTo)
.toString();
}
}
private static class IrreversibleMetastoreOperation
{
private final String description;
private final Runnable action;
public IrreversibleMetastoreOperation(String description, Runnable action)
{
this.description = requireNonNull(description, "description is null");
this.action = requireNonNull(action, "action is null");
}
public String getDescription()
{
return description;
}
public void run()
{
action.run();
}
}
private static class CreateTableOperation
{
private final HiveIdentity identity;
private final Table newTable;
private final PrincipalPrivileges privileges;
private boolean tableCreated;
private final boolean ignoreExisting;
private final String queryId;
public CreateTableOperation(HiveIdentity identity, Table newTable, PrincipalPrivileges privileges, boolean ignoreExisting)
{
this.identity = requireNonNull(identity, "identity is null");
requireNonNull(newTable, "newTable is null");
this.newTable = newTable;
this.privileges = requireNonNull(privileges, "privileges is null");
this.ignoreExisting = ignoreExisting;
this.queryId = getPrestoQueryId(newTable).orElseThrow(() -> new IllegalArgumentException("Query id is not present"));
}
public String getDescription()
{
return format("add table %s.%s", newTable.getDatabaseName(), newTable.getTableName());
}
public void run(HiveMetastoreClosure metastore)
{
boolean done = false;
try {
metastore.createTable(identity, newTable, privileges);
done = true;
}
catch (RuntimeException e) {
try {
Optional
existingTable = metastore.getTable(identity, newTable.getDatabaseName(), newTable.getTableName());
if (existingTable.isPresent()) {
Table table = existingTable.get();
Optional existingTableQueryId = getPrestoQueryId(table);
if (existingTableQueryId.isPresent() && existingTableQueryId.get().equals(queryId)) {
// ignore table if it was already created by the same query during retries
done = true;
}
else {
// If the table definition in the metastore is different than what this tx wants to create
// then there is a conflict (e.g., current tx wants to create T(a: bigint),
// but another tx already created T(a: varchar)).
// This may be a problem if there is an insert after this step.
if (!hasTheSameSchema(newTable, table)) {
e = new PrestoException(TRANSACTION_CONFLICT, format("Table already exists with a different schema: '%s'", newTable.getTableName()));
}
else {
done = ignoreExisting;
}
}
}
}
catch (RuntimeException ignored) {
// When table could not be fetched from metastore, it is not known whether the table was added.
// Deleting the table when aborting commit has the risk of deleting table not added in this transaction.
// Not deleting the table may leave garbage behind. The former is much more dangerous than the latter.
// Therefore, the table is not considered added.
}
if (!done) {
throw e;
}
}
tableCreated = true;
}
private boolean hasTheSameSchema(Table newTable, Table existingTable)
{
List newTableColumns = newTable.getDataColumns();
List existingTableColumns = existingTable.getDataColumns();
if (newTableColumns.size() != existingTableColumns.size()) {
return false;
}
for (Column existingColumn : existingTableColumns) {
if (newTableColumns.stream()
.noneMatch(newColumn -> newColumn.getName().equals(existingColumn.getName())
&& newColumn.getType().equals(existingColumn.getType()))) {
return false;
}
}
return true;
}
public void undo(HiveMetastoreClosure metastore)
{
if (!tableCreated) {
return;
}
metastore.dropTable(identity, newTable.getDatabaseName(), newTable.getTableName(), false);
}
}
private static class AlterTableOperation
{
private final HiveIdentity identity;
private final Table newTable;
private final Table oldTable;
private final PrincipalPrivileges principalPrivileges;
private boolean undo;
public AlterTableOperation(HiveIdentity identity, Table newTable, Table oldTable, PrincipalPrivileges principalPrivileges)
{
this.identity = requireNonNull(identity, "identity is null");
this.newTable = requireNonNull(newTable, "newTable is null");
this.oldTable = requireNonNull(oldTable, "oldTable is null");
this.principalPrivileges = requireNonNull(principalPrivileges, "principalPrivileges is null");
checkArgument(newTable.getDatabaseName().equals(oldTable.getDatabaseName()));
checkArgument(newTable.getTableName().equals(oldTable.getTableName()));
}
public String getDescription()
{
return format(
"alter table %s.%s",
newTable.getDatabaseName(),
newTable.getTableName());
}
public void run(HiveMetastoreClosure metastore)
{
undo = true;
metastore.replaceTable(identity, newTable.getDatabaseName(), newTable.getTableName(), newTable, principalPrivileges);
}
public void undo(HiveMetastoreClosure metastore)
{
if (!undo) {
return;
}
metastore.replaceTable(identity, oldTable.getDatabaseName(), oldTable.getTableName(), oldTable, principalPrivileges);
}
}
private static class AlterPartitionOperation
{
private final HiveIdentity identity;
private final PartitionWithStatistics newPartition;
private final PartitionWithStatistics oldPartition;
private boolean undo;
public AlterPartitionOperation(HiveIdentity identity, PartitionWithStatistics newPartition, PartitionWithStatistics oldPartition)
{
this.identity = requireNonNull(identity, "identity is null");
this.newPartition = requireNonNull(newPartition, "newPartition is null");
this.oldPartition = requireNonNull(oldPartition, "oldPartition is null");
checkArgument(newPartition.getPartition().getDatabaseName().equals(oldPartition.getPartition().getDatabaseName()));
checkArgument(newPartition.getPartition().getTableName().equals(oldPartition.getPartition().getTableName()));
checkArgument(newPartition.getPartition().getValues().equals(oldPartition.getPartition().getValues()));
}
public String getDescription()
{
return format(
"alter partition %s.%s %s",
newPartition.getPartition().getDatabaseName(),
newPartition.getPartition().getTableName(),
newPartition.getPartition().getValues());
}
public void run(HiveMetastoreClosure metastore)
{
undo = true;
metastore.alterPartition(identity, newPartition.getPartition().getDatabaseName(), newPartition.getPartition().getTableName(), newPartition);
}
public void undo(HiveMetastoreClosure metastore)
{
if (!undo) {
return;
}
metastore.alterPartition(identity, oldPartition.getPartition().getDatabaseName(), oldPartition.getPartition().getTableName(), oldPartition);
}
}
private static class UpdateStatisticsOperation
{
private final HiveIdentity identity;
private final SchemaTableName tableName;
private final Optional partitionName;
private final PartitionStatistics statistics;
private final boolean merge;
private boolean done;
public UpdateStatisticsOperation(HiveIdentity identity, SchemaTableName tableName, Optional partitionName, PartitionStatistics statistics, boolean merge)
{
this.identity = requireNonNull(identity, "identity is null");
this.tableName = requireNonNull(tableName, "tableName is null");
this.partitionName = requireNonNull(partitionName, "partitionValues is null");
this.statistics = requireNonNull(statistics, "statistics is null");
this.merge = merge;
}
public void run(HiveMetastoreClosure metastore)
{
if (partitionName.isPresent()) {
metastore.updatePartitionStatistics(identity, tableName.getSchemaName(), tableName.getTableName(), partitionName.get(), this::updateStatistics);
}
else {
metastore.updateTableStatistics(identity, tableName.getSchemaName(), tableName.getTableName(), this::updateStatistics);
}
done = true;
}
public void undo(HiveMetastoreClosure metastore)
{
if (!done) {
return;
}
if (partitionName.isPresent()) {
metastore.updatePartitionStatistics(identity, tableName.getSchemaName(), tableName.getTableName(), partitionName.get(), this::resetStatistics);
}
else {
metastore.updateTableStatistics(identity, tableName.getSchemaName(), tableName.getTableName(), this::resetStatistics);
}
}
public String getDescription()
{
if (partitionName.isPresent()) {
return format("replace partition parameters %s %s", tableName, partitionName.get());
}
return format("replace table parameters %s", tableName);
}
private PartitionStatistics updateStatistics(PartitionStatistics currentStatistics)
{
return merge ? merge(currentStatistics, statistics) : statistics;
}
private PartitionStatistics resetStatistics(PartitionStatistics currentStatistics)
{
return new PartitionStatistics(reduce(currentStatistics.getBasicStatistics(), statistics.getBasicStatistics(), SUBTRACT), ImmutableMap.of());
}
}
private static class PartitionAdder
{
private final HiveIdentity identity;
private final String schemaName;
private final String tableName;
private final HiveMetastoreClosure metastore;
private final int batchSize;
private final List partitions;
private List> createdPartitionValues = new ArrayList<>();
public PartitionAdder(HiveIdentity identity, String schemaName, String tableName, HiveMetastoreClosure metastore, int batchSize)
{
this.identity = identity;
this.schemaName = schemaName;
this.tableName = tableName;
this.metastore = metastore;
this.batchSize = batchSize;
this.partitions = new ArrayList<>(batchSize);
}
public String getSchemaName()
{
return schemaName;
}
public String getTableName()
{
return tableName;
}
public void addPartition(PartitionWithStatistics partition)
{
checkArgument(getPrestoQueryId(partition.getPartition()).isPresent());
partitions.add(partition);
}
public void execute()
{
List> batchedPartitions = Lists.partition(partitions, batchSize);
for (List batch : batchedPartitions) {
try {
metastore.addPartitions(identity, schemaName, tableName, batch);
for (PartitionWithStatistics partition : batch) {
createdPartitionValues.add(partition.getPartition().getValues());
}
}
catch (Throwable t) {
// Add partition to the created list conservatively.
// Some metastore implementations are known to violate the "all or none" guarantee for add_partitions call.
boolean batchCompletelyAdded = true;
for (PartitionWithStatistics partition : batch) {
try {
Optional remotePartition = metastore.getPartition(identity, schemaName, tableName, partition.getPartition().getValues());
// getPrestoQueryId(partition) is guaranteed to be non-empty. It is asserted in PartitionAdder.addPartition.
if (remotePartition.isPresent() && getPrestoQueryId(remotePartition.get()).equals(getPrestoQueryId(partition.getPartition()))) {
createdPartitionValues.add(partition.getPartition().getValues());
}
else {
batchCompletelyAdded = false;
}
}
catch (Throwable ignored) {
// When partition could not be fetched from metastore, it is not known whether the partition was added.
// Deleting the partition when aborting commit has the risk of deleting partition not added in this transaction.
// Not deleting the partition may leave garbage behind. The former is much more dangerous than the latter.
// Therefore, the partition is not added to the createdPartitionValues list here.
batchCompletelyAdded = false;
}
}
// If all the partitions were added successfully, the add_partition operation was actually successful.
// For some reason, it threw an exception (communication failure, retry failure after communication failure, etc).
// But we would consider it successful anyways.
if (!batchCompletelyAdded) {
if (t instanceof TableNotFoundException) {
throw new PrestoException(HIVE_TABLE_DROPPED_DURING_QUERY, t);
}
throw t;
}
}
}
partitions.clear();
}
public List> rollback()
{
// drop created partitions
List> partitionsFailedToRollback = new ArrayList<>();
for (List createdPartitionValue : createdPartitionValues) {
try {
metastore.dropPartition(identity, schemaName, tableName, createdPartitionValue, false);
}
catch (PartitionNotFoundException e) {
// Maybe some one deleted the partition we added.
// Anyways, we are good because the partition is not there anymore.
}
catch (Throwable t) {
partitionsFailedToRollback.add(createdPartitionValue);
}
}
createdPartitionValues = partitionsFailedToRollback;
return partitionsFailedToRollback;
}
}
private static class RecursiveDeleteResult
{
private final boolean directoryNoLongerExists;
private final List notDeletedEligibleItems;
public RecursiveDeleteResult(boolean directoryNoLongerExists, List notDeletedEligibleItems)
{
this.directoryNoLongerExists = directoryNoLongerExists;
this.notDeletedEligibleItems = notDeletedEligibleItems;
}
public boolean isDirectoryNoLongerExists()
{
return directoryNoLongerExists;
}
public List getNotDeletedEligibleItems()
{
return notDeletedEligibleItems;
}
}
private interface ExclusiveOperation
{
void execute(HiveMetastoreClosure delegate, HdfsEnvironment hdfsEnvironment);
}
}
