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* the Apache License, Version 2.0 (the "License"); you may
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* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing,
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* specific language governing permissions and limitations
* under the License.
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package org.elasticsearch.indices.recovery;
import org.apache.logging.log4j.Logger;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexFormatTooNewException;
import org.apache.lucene.index.IndexFormatTooOldException;
import org.elasticsearch.Assertions;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.Version;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.indices.flush.FlushRequest;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.UUIDs;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.lucene.Lucene;
import org.elasticsearch.common.util.CancellableThreads;
import org.elasticsearch.common.util.concurrent.AbstractRefCounted;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.mapper.MapperException;
import org.elasticsearch.index.seqno.ReplicationTracker;
import org.elasticsearch.index.seqno.RetentionLeases;
import org.elasticsearch.index.seqno.SequenceNumbers;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.index.shard.IndexShardNotRecoveringException;
import org.elasticsearch.index.shard.IndexShardState;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.store.Store;
import org.elasticsearch.index.store.StoreFileMetaData;
import org.elasticsearch.index.translog.Translog;
import java.io.IOException;
import java.nio.file.Path;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
/**
* Represents a recovery where the current node is the target node of the recovery. To track recoveries in a central place, instances of
* this class are created through {@link RecoveriesCollection}.
*/
public class RecoveryTarget extends AbstractRefCounted implements RecoveryTargetHandler {
private final Logger logger;
private static final AtomicLong idGenerator = new AtomicLong();
private static final String RECOVERY_PREFIX = "recovery.";
private final ShardId shardId;
private final long recoveryId;
private final IndexShard indexShard;
private final DiscoveryNode sourceNode;
private final MultiFileWriter multiFileWriter;
private final Store store;
private final PeerRecoveryTargetService.RecoveryListener listener;
private final AtomicBoolean finished = new AtomicBoolean();
private final CancellableThreads cancellableThreads;
// last time this status was accessed
private volatile long lastAccessTime = System.nanoTime();
// latch that can be used to blockingly wait for RecoveryTarget to be closed
private final CountDownLatch closedLatch = new CountDownLatch(1);
/**
* Creates a new recovery target object that represents a recovery to the provided shard.
*
* @param indexShard local shard where we want to recover to
* @param sourceNode source node of the recovery where we recover from
* @param listener called when recovery is completed/failed
*/
public RecoveryTarget(IndexShard indexShard, DiscoveryNode sourceNode, PeerRecoveryTargetService.RecoveryListener listener) {
super("recovery_status");
this.cancellableThreads = new CancellableThreads();
this.recoveryId = idGenerator.incrementAndGet();
this.listener = listener;
this.logger = Loggers.getLogger(getClass(), indexShard.shardId());
this.indexShard = indexShard;
this.sourceNode = sourceNode;
this.shardId = indexShard.shardId();
final String tempFilePrefix = RECOVERY_PREFIX + UUIDs.randomBase64UUID() + ".";
this.multiFileWriter = new MultiFileWriter(indexShard.store(), indexShard.recoveryState().getIndex(), tempFilePrefix, logger,
this::ensureRefCount);
this.store = indexShard.store();
// make sure the store is not released until we are done.
store.incRef();
indexShard.recoveryStats().incCurrentAsTarget();
}
/**
* Returns a fresh recovery target to retry recovery from the same source node onto the same shard and using the same listener.
*
* @return a copy of this recovery target
*/
public RecoveryTarget retryCopy() {
return new RecoveryTarget(indexShard, sourceNode, listener);
}
public long recoveryId() {
return recoveryId;
}
public ShardId shardId() {
return shardId;
}
public IndexShard indexShard() {
ensureRefCount();
return indexShard;
}
public DiscoveryNode sourceNode() {
return this.sourceNode;
}
public RecoveryState state() {
return indexShard.recoveryState();
}
public CancellableThreads cancellableThreads() {
return cancellableThreads;
}
/** return the last time this RecoveryStatus was used (based on System.nanoTime() */
public long lastAccessTime() {
return lastAccessTime;
}
/** sets the lasAccessTime flag to now */
public void setLastAccessTime() {
lastAccessTime = System.nanoTime();
}
public Store store() {
ensureRefCount();
return store;
}
/**
* Closes the current recovery target and waits up to a certain timeout for resources to be freed.
* Returns true if resetting the recovery was successful, false if the recovery target is already cancelled / failed or marked as done.
*/
boolean resetRecovery(CancellableThreads newTargetCancellableThreads) throws IOException {
if (finished.compareAndSet(false, true)) {
try {
logger.debug("reset of recovery with shard {} and id [{}]", shardId, recoveryId);
} finally {
// release the initial reference. recovery files will be cleaned as soon as ref count goes to zero, potentially now.
decRef();
}
try {
newTargetCancellableThreads.execute(closedLatch::await);
} catch (CancellableThreads.ExecutionCancelledException e) {
logger.trace("new recovery target cancelled for shard {} while waiting on old recovery target with id [{}] to close",
shardId, recoveryId);
return false;
}
RecoveryState.Stage stage = indexShard.recoveryState().getStage();
if (indexShard.recoveryState().getPrimary() && (stage == RecoveryState.Stage.FINALIZE || stage == RecoveryState.Stage.DONE)) {
// once primary relocation has moved past the finalization step, the relocation source can put the target into primary mode
// and start indexing as primary into the target shard (see TransportReplicationAction). Resetting the target shard in this
// state could mean that indexing is halted until the recovery retry attempt is completed and could also destroy existing
// documents indexed and acknowledged before the reset.
assert stage != RecoveryState.Stage.DONE : "recovery should not have completed when it's being reset";
throw new IllegalStateException("cannot reset recovery as previous attempt made it past finalization step");
}
indexShard.performRecoveryRestart();
return true;
}
return false;
}
/**
* cancel the recovery. calling this method will clean temporary files and release the store
* unless this object is in use (in which case it will be cleaned once all ongoing users call
* {@link #decRef()}
*
* if {@link #cancellableThreads()} was used, the threads will be interrupted.
*/
public void cancel(String reason) {
if (finished.compareAndSet(false, true)) {
try {
logger.debug("recovery canceled (reason: [{}])", reason);
cancellableThreads.cancel(reason);
} finally {
// release the initial reference. recovery files will be cleaned as soon as ref count goes to zero, potentially now
decRef();
}
}
}
/**
* fail the recovery and call listener
*
* @param e exception that encapsulating the failure
* @param sendShardFailure indicates whether to notify the master of the shard failure
*/
public void fail(RecoveryFailedException e, boolean sendShardFailure) {
if (finished.compareAndSet(false, true)) {
try {
notifyListener(e, sendShardFailure);
} finally {
try {
cancellableThreads.cancel("failed recovery [" + ExceptionsHelper.stackTrace(e) + "]");
} finally {
// release the initial reference. recovery files will be cleaned as soon as ref count goes to zero, potentially now
decRef();
}
}
}
}
public void notifyListener(RecoveryFailedException e, boolean sendShardFailure) {
listener.onRecoveryFailure(state(), e, sendShardFailure);
}
/** mark the current recovery as done */
public void markAsDone() {
if (finished.compareAndSet(false, true)) {
assert multiFileWriter.tempFileNames.isEmpty() : "not all temporary files are renamed";
try {
// this might still throw an exception ie. if the shard is CLOSED due to some other event.
// it's safer to decrement the reference in a try finally here.
indexShard.postRecovery("peer recovery done");
} finally {
// release the initial reference. recovery files will be cleaned as soon as ref count goes to zero, potentially now
decRef();
}
listener.onRecoveryDone(state());
}
}
@Override
protected void closeInternal() {
try {
multiFileWriter.close();
} finally {
// free store. increment happens in constructor
store.decRef();
indexShard.recoveryStats().decCurrentAsTarget();
closedLatch.countDown();
}
}
@Override
public String toString() {
return shardId + " [" + recoveryId + "]";
}
private void ensureRefCount() {
if (refCount() <= 0) {
throw new ElasticsearchException("RecoveryStatus is used but it's refcount is 0. Probably a mismatch between incRef/decRef " +
"calls");
}
}
/*** Implementation of {@link RecoveryTargetHandler } */
@Override
public void prepareForTranslogOperations(int totalTranslogOps, ActionListener listener) {
ActionListener.completeWith(listener, () -> {
state().getTranslog().totalOperations(totalTranslogOps);
indexShard().openEngineAndSkipTranslogRecovery();
return null;
});
}
@Override
public void finalizeRecovery(final long globalCheckpoint, final long trimAboveSeqNo, ActionListener listener) {
ActionListener.completeWith(listener, () -> {
indexShard.updateGlobalCheckpointOnReplica(globalCheckpoint, "finalizing recovery");
// Persist the global checkpoint.
indexShard.sync();
indexShard.persistRetentionLeases();
if (trimAboveSeqNo != SequenceNumbers.UNASSIGNED_SEQ_NO) {
// We should erase all translog operations above trimAboveSeqNo as we have received either the same or a newer copy
// from the recovery source in phase2. Rolling a new translog generation is not strictly required here for we won't
// trim the current generation. It's merely to satisfy the assumption that the current generation does not have any
// operation that would be trimmed (see TranslogWriter#assertNoSeqAbove). This assumption does not hold for peer
// recovery because we could have received operations above startingSeqNo from the previous primary terms.
indexShard.rollTranslogGeneration();
// the flush or translog generation threshold can be reached after we roll a new translog
indexShard.afterWriteOperation();
indexShard.trimOperationOfPreviousPrimaryTerms(trimAboveSeqNo);
}
if (hasUncommittedOperations()) {
indexShard.flush(new FlushRequest().force(true).waitIfOngoing(true));
}
indexShard.finalizeRecovery();
return null;
});
}
private boolean hasUncommittedOperations() throws IOException {
long localCheckpointOfCommit = Long.parseLong(indexShard.commitStats().getUserData().get(SequenceNumbers.LOCAL_CHECKPOINT_KEY));
return indexShard.estimateNumberOfHistoryOperations("peer-recovery",
indexShard.indexSettings().isSoftDeleteEnabled() ? Engine.HistorySource.INDEX : Engine.HistorySource.TRANSLOG,
localCheckpointOfCommit + 1) > 0;
}
@Override
public void handoffPrimaryContext(final ReplicationTracker.PrimaryContext primaryContext) {
indexShard.activateWithPrimaryContext(primaryContext);
}
@Override
public void indexTranslogOperations(
final List operations,
final int totalTranslogOps,
final long maxSeenAutoIdTimestampOnPrimary,
final long maxSeqNoOfDeletesOrUpdatesOnPrimary,
final RetentionLeases retentionLeases,
final long mappingVersionOnPrimary,
final ActionListener listener) {
ActionListener.completeWith(listener, () -> {
final RecoveryState.Translog translog = state().getTranslog();
translog.totalOperations(totalTranslogOps);
assert indexShard().recoveryState() == state();
if (indexShard().state() != IndexShardState.RECOVERING) {
throw new IndexShardNotRecoveringException(shardId, indexShard().state());
}
/*
* The maxSeenAutoIdTimestampOnPrimary received from the primary is at least the highest auto_id_timestamp from any operation
* will be replayed. Bootstrapping this timestamp here will disable the optimization for original append-only requests
* (source of these operations) replicated via replication. Without this step, we may have duplicate documents if we
* replay these operations first (without timestamp), then optimize append-only requests (with timestamp).
*/
indexShard().updateMaxUnsafeAutoIdTimestamp(maxSeenAutoIdTimestampOnPrimary);
/*
* Bootstrap the max_seq_no_of_updates from the primary to make sure that the max_seq_no_of_updates on this replica when
* replaying any of these operations will be at least the max_seq_no_of_updates on the primary when that op was executed on.
*/
indexShard().advanceMaxSeqNoOfUpdatesOrDeletes(maxSeqNoOfDeletesOrUpdatesOnPrimary);
/*
* We have to update the retention leases before we start applying translog operations to ensure we are retaining according to
* the policy.
*/
indexShard().updateRetentionLeasesOnReplica(retentionLeases);
for (Translog.Operation operation : operations) {
Engine.Result result = indexShard().applyTranslogOperation(operation, Engine.Operation.Origin.PEER_RECOVERY);
if (result.getResultType() == Engine.Result.Type.MAPPING_UPDATE_REQUIRED) {
throw new MapperException("mapping updates are not allowed [" + operation + "]");
}
if (result.getFailure() != null) {
if (Assertions.ENABLED && result.getFailure() instanceof MapperException == false) {
throw new AssertionError("unexpected failure while replicating translog entry", result.getFailure());
}
ExceptionsHelper.reThrowIfNotNull(result.getFailure());
}
}
// update stats only after all operations completed (to ensure that mapping updates don't mess with stats)
translog.incrementRecoveredOperations(operations.size());
indexShard().sync();
// roll over / flush / trim if needed
indexShard().afterWriteOperation();
return indexShard().getLocalCheckpoint();
});
}
@Override
public void receiveFileInfo(List phase1FileNames,
List phase1FileSizes,
List phase1ExistingFileNames,
List phase1ExistingFileSizes,
int totalTranslogOps,
ActionListener listener) {
ActionListener.completeWith(listener, () -> {
indexShard.resetRecoveryStage();
indexShard.prepareForIndexRecovery();
final RecoveryState.Index index = state().getIndex();
for (int i = 0; i < phase1ExistingFileNames.size(); i++) {
index.addFileDetail(phase1ExistingFileNames.get(i), phase1ExistingFileSizes.get(i), true);
}
for (int i = 0; i < phase1FileNames.size(); i++) {
index.addFileDetail(phase1FileNames.get(i), phase1FileSizes.get(i), false);
}
state().getTranslog().totalOperations(totalTranslogOps);
state().getTranslog().totalOperationsOnStart(totalTranslogOps);
return null;
});
}
@Override
public void cleanFiles(int totalTranslogOps, long globalCheckpoint, Store.MetadataSnapshot sourceMetaData,
ActionListener listener) {
ActionListener.completeWith(listener, () -> {
state().getTranslog().totalOperations(totalTranslogOps);
// first, we go and move files that were created with the recovery id suffix to
// the actual names, its ok if we have a corrupted index here, since we have replicas
// to recover from in case of a full cluster shutdown just when this code executes...
multiFileWriter.renameAllTempFiles();
final Store store = store();
store.incRef();
try {
store.cleanupAndVerify("recovery CleanFilesRequestHandler", sourceMetaData);
if (indexShard.indexSettings().getIndexVersionCreated().before(Version.V_6_0_0_rc1)) {
store.ensureIndexHasHistoryUUID();
}
final String translogUUID = Translog.createEmptyTranslog(
indexShard.shardPath().resolveTranslog(), globalCheckpoint, shardId, indexShard.getPendingPrimaryTerm());
store.associateIndexWithNewTranslog(translogUUID);
if (indexShard.getRetentionLeases().leases().isEmpty()) {
// if empty, may be a fresh IndexShard, so write an empty leases file to disk
indexShard.persistRetentionLeases();
assert indexShard.loadRetentionLeases().leases().isEmpty();
} else {
assert indexShard.assertRetentionLeasesPersisted();
}
indexShard.maybeCheckIndex();
state().setStage(RecoveryState.Stage.TRANSLOG);
} catch (CorruptIndexException | IndexFormatTooNewException | IndexFormatTooOldException ex) {
// this is a fatal exception at this stage.
// this means we transferred files from the remote that have not be checksummed and they are
// broken. We have to clean up this shard entirely, remove all files and bubble it up to the
// source shard since this index might be broken there as well? The Source can handle this and checks
// its content on disk if possible.
try {
try {
store.removeCorruptionMarker();
} finally {
Lucene.cleanLuceneIndex(store.directory()); // clean up and delete all files
}
} catch (Exception e) {
logger.debug("Failed to clean lucene index", e);
ex.addSuppressed(e);
}
RecoveryFailedException rfe = new RecoveryFailedException(state(), "failed to clean after recovery", ex);
fail(rfe, true);
throw rfe;
} catch (Exception ex) {
RecoveryFailedException rfe = new RecoveryFailedException(state(), "failed to clean after recovery", ex);
fail(rfe, true);
throw rfe;
} finally {
store.decRef();
}
return null;
});
}
@Override
public void writeFileChunk(StoreFileMetaData fileMetaData, long position, BytesReference content,
boolean lastChunk, int totalTranslogOps, ActionListener listener) {
try {
state().getTranslog().totalOperations(totalTranslogOps);
multiFileWriter.writeFileChunk(fileMetaData, position, content, lastChunk);
listener.onResponse(null);
} catch (Exception e) {
listener.onFailure(e);
}
}
/** Get a temporary name for the provided file name. */
public String getTempNameForFile(String origFile) {
return multiFileWriter.getTempNameForFile(origFile);
}
Path translogLocation() {
return indexShard().shardPath().resolveTranslog();
}
}