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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cassandra.index.sai;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.stream.Collectors;
import com.google.common.collect.Maps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.compaction.CompactionInfo;
import org.apache.cassandra.db.compaction.CompactionInterruptedException;
import org.apache.cassandra.db.compaction.OperationType;
import org.apache.cassandra.db.lifecycle.LifecycleTransaction;
import org.apache.cassandra.db.lifecycle.Tracker;
import org.apache.cassandra.index.SecondaryIndexBuilder;
import org.apache.cassandra.index.sai.disk.StorageAttachedIndexWriter;
import org.apache.cassandra.index.sai.disk.format.IndexDescriptor;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.KeyIterator;
import org.apache.cassandra.io.sstable.SSTableIdentityIterator;
import org.apache.cassandra.io.sstable.SSTableFlushObserver;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.io.util.RandomAccessReader;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.Throwables;
import org.apache.cassandra.utils.TimeUUID;
import org.apache.cassandra.utils.concurrent.CountDownLatch;
import org.apache.cassandra.utils.concurrent.Ref;
import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
/**
* Multiple storage-attached indexes can start building concurrently. We need to make sure:
* 1. Per-SSTable index files are built only once
* a. Per-SSTable index files already built, do nothing
* b. Per-SSTable index files are currently building, we need to wait until it's built in order to consider index built.
* 2. Per-column index files are built for each column index
*/
public class StorageAttachedIndexBuilder extends SecondaryIndexBuilder
{
protected static final Logger logger = LoggerFactory.getLogger(StorageAttachedIndexBuilder.class);
// make sure only one builder can write to per sstable files when multiple storage-attached indexes are created simultaneously.
private static final Map inProgress = Maps.newConcurrentMap();
private final StorageAttachedIndexGroup group;
private final TableMetadata metadata;
private final Tracker tracker;
private final TimeUUID compactionId = nextTimeUUID();
private final boolean isFullRebuild;
private final boolean isInitialBuild;
private final SortedMap> sstables;
private long bytesProcessed = 0;
private final long totalSizeInBytes;
StorageAttachedIndexBuilder(StorageAttachedIndexGroup group,
SortedMap> sstables,
boolean isFullRebuild,
boolean isInitialBuild)
{
this.group = group;
this.metadata = group.metadata();
this.sstables = sstables;
this.tracker = group.table().getTracker();
this.isFullRebuild = isFullRebuild;
this.isInitialBuild = isInitialBuild;
this.totalSizeInBytes = sstables.keySet().stream().mapToLong(SSTableReader::uncompressedLength).sum();
}
@Override
public void build()
{
logger.debug(logMessage(String.format("Starting %s %s index build...",
isInitialBuild ? "initial" : "non-initial",
isFullRebuild ? "full" : "partial")));
for (Map.Entry> e : sstables.entrySet())
{
SSTableReader sstable = e.getKey();
Set indexes = e.getValue();
Set existing = validateIndexes(indexes, sstable.descriptor);
if (existing.isEmpty())
{
logger.debug(logMessage("{} dropped during index build"), indexes);
continue;
}
if (indexSSTable(sstable, existing))
return;
}
}
private String logMessage(String message)
{
return String.format("[%s.%s.*] %s", metadata.keyspace, metadata.name, message);
}
/**
* @return true if index build should be stopped
*/
private boolean indexSSTable(SSTableReader sstable, Set indexes)
{
logger.debug(logMessage("Starting index build on {}"), sstable.descriptor);
CountDownLatch perSSTableFileLock = null;
StorageAttachedIndexWriter indexWriter = null;
Ref ref = sstable.tryRef();
if (ref == null)
{
logger.warn(logMessage("Couldn't acquire reference to the SSTable {}. It may have been removed."), sstable.descriptor);
return false;
}
try (RandomAccessReader dataFile = sstable.openDataReader();
LifecycleTransaction txn = LifecycleTransaction.offline(OperationType.INDEX_BUILD, sstable))
{
perSSTableFileLock = shouldWritePerSSTableFiles(sstable);
// If we were unable to get the per-SSTable file lock it means that the
// per-SSTable components are already being built, so we only want to
// build the per-index components
boolean perIndexComponentsOnly = perSSTableFileLock == null;
// remove existing per column index files instead of overwriting
IndexDescriptor indexDescriptor = IndexDescriptor.create(sstable);
indexes.forEach(index -> indexDescriptor.deleteColumnIndex(index.getIndexContext()));
indexWriter = StorageAttachedIndexWriter.createBuilderWriter(indexDescriptor, indexes, txn, perIndexComponentsOnly);
indexWriter.begin();
long previousBytesRead = 0;
try (KeyIterator keys = sstable.keyIterator())
{
while (keys.hasNext())
{
if (isStopRequested())
{
logger.debug(indexDescriptor.logMessage("Index build has been stopped"));
throw new CompactionInterruptedException(getCompactionInfo());
}
DecoratedKey key = keys.next();
indexWriter.startPartition(key, -1, -1);
long position = sstable.getPosition(key, SSTableReader.Operator.EQ);
dataFile.seek(position);
ByteBufferUtil.readWithShortLength(dataFile); // key
try (SSTableIdentityIterator partition = SSTableIdentityIterator.create(sstable, dataFile, key))
{
// if the row has statics attached, it has to be indexed separately
if (metadata.hasStaticColumns())
indexWriter.nextUnfilteredCluster(partition.staticRow());
while (partition.hasNext())
indexWriter.nextUnfilteredCluster(partition.next());
}
long bytesRead = keys.getBytesRead();
bytesProcessed += bytesRead - previousBytesRead;
previousBytesRead = bytesRead;
}
completeSSTable(indexWriter, sstable, indexes, perSSTableFileLock);
}
return false;
}
catch (Throwable t)
{
if (indexWriter != null)
{
indexWriter.abort(t, true);
}
if (t instanceof InterruptedException)
{
logger.warn(logMessage("Interrupted while building indexes {} on SSTable {}"), indexes, sstable.descriptor);
Thread.currentThread().interrupt();
return true;
}
else if (t instanceof CompactionInterruptedException)
{
//TODO Shouldn't do this if the stop was interrupted by a truncate
if (isInitialBuild)
{
logger.error(logMessage("Stop requested while building initial indexes {} on SSTable {}."), indexes, sstable.descriptor);
throw Throwables.unchecked(t);
}
else
{
logger.info(logMessage("Stop requested while building indexes {} on SSTable {}."), indexes, sstable.descriptor);
return true;
}
}
else
{
logger.error(logMessage("Unable to build indexes {} on SSTable {}. Cause: {}."), indexes, sstable, t.getMessage());
throw Throwables.unchecked(t);
}
}
finally
{
ref.release();
// release current lock in case of error
if (perSSTableFileLock != null)
{
inProgress.remove(sstable);
perSSTableFileLock.decrement();
}
}
}
@Override
public CompactionInfo getCompactionInfo()
{
return new CompactionInfo(metadata,
OperationType.INDEX_BUILD,
bytesProcessed,
totalSizeInBytes,
compactionId,
sstables.keySet());
}
/**
* if the per sstable index files are already created, no need to write them again, unless found corrupted on rebuild
* if not created, try to acquire a lock, so only one builder will generate per sstable index files
*/
private CountDownLatch shouldWritePerSSTableFiles(SSTableReader sstable)
{
IndexDescriptor indexDescriptor = IndexDescriptor.create(sstable);
// if per-table files are incomplete, full rebuild is requested, or checksum fails
if (!indexDescriptor.isPerSSTableIndexBuildComplete()
|| isFullRebuild
|| !indexDescriptor.validatePerSSTableComponents(IndexValidation.CHECKSUM))
{
CountDownLatch latch = CountDownLatch.newCountDownLatch(1);
if (inProgress.putIfAbsent(sstable, latch) == null)
{
// lock owner should clean up existing per-SSTable files
group.deletePerSSTableFiles(Collections.singleton(sstable));
return latch;
}
}
return null;
}
private void completeSSTable(SSTableFlushObserver indexWriter,
SSTableReader sstable,
Set indexes,
CountDownLatch latch) throws InterruptedException
{
indexWriter.complete();
if (latch != null)
{
// current builder owns the lock
latch.decrement();
}
else
{
/*
* When there is no lock, it means the per sstable index files are already created, just proceed to finish.
* When there is a lock held by another builder, wait for it to finish before finishing marking current index built.
*/
latch = inProgress.get(sstable);
if (latch != null)
latch.await();
}
Set existing = validateIndexes(indexes, sstable.descriptor);
if (existing.isEmpty())
{
logger.debug(logMessage("{} dropped during index build"), indexes);
return;
}
// register custom index components into existing sstables
sstable.registerComponents(StorageAttachedIndexGroup.getLiveComponents(sstable, existing), tracker);
Set incomplete = group.onSSTableChanged(Collections.emptyList(), Collections.singleton(sstable), existing, IndexValidation.NONE);
if (!incomplete.isEmpty())
{
// If this occurs during an initial index build, there is only one index in play, and
// throwing here to terminate makes sense. (This allows the initialization task to fail
// correctly and be marked as failed by the SIM.) In other cases, such as rebuilding a
// set of indexes for a new added/streamed SSTables, we terminate pessimistically. In
// other words, we abort the SSTable index write across all column indexes and mark
// then non-queryable until a restart or other incremental rebuild occurs.
throw new RuntimeException(logMessage("Failed to update views on column indexes " + incomplete + " on indexes " + indexes + '.'));
}
}
/**
* In case of full rebuild, stop the index build if any index is dropped.
* Otherwise, skip dropped indexes to avoid exception during repair/streaming.
*/
private Set validateIndexes(Set indexes, Descriptor descriptor)
{
Set existing = new HashSet<>();
Set dropped = new HashSet<>();
for (StorageAttachedIndex index : indexes)
{
if (group.containsIndex(index))
existing.add(index);
else
dropped.add(index);
}
if (!dropped.isEmpty())
{
String droppedIndexes = dropped.stream().map(sai -> sai.getIndexContext().getIndexName()).collect(Collectors.toList()).toString();
if (isFullRebuild)
throw new RuntimeException(logMessage(String.format("%s are dropped, will stop index build.", droppedIndexes)));
else
logger.debug(logMessage("Skip building dropped index {} on sstable {}"), droppedIndexes, descriptor.baseFile());
}
return existing;
}
}
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