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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.db.compaction.writers;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.Directories;
import org.apache.cassandra.db.DiskBoundaries;
import org.apache.cassandra.db.PartitionPosition;
import org.apache.cassandra.db.SerializationHeader;
import org.apache.cassandra.db.compaction.CompactionTask;
import org.apache.cassandra.db.lifecycle.LifecycleTransaction;
import org.apache.cassandra.db.rows.UnfilteredRowIterator;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.SSTableRewriter;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.io.sstable.format.SSTableWriter;
import org.apache.cassandra.io.sstable.metadata.MetadataCollector;
import org.apache.cassandra.io.util.File;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.TimeUUID;
import org.apache.cassandra.utils.concurrent.Transactional;
/**
* Class that abstracts away the actual writing of files to make it possible to use CompactionTask for more
* use cases.
*/
public abstract class CompactionAwareWriter extends Transactional.AbstractTransactional implements Transactional
{
protected static final Logger logger = LoggerFactory.getLogger(CompactionAwareWriter.class);
protected final ColumnFamilyStore cfs;
protected final Directories directories;
protected final Set nonExpiredSSTables;
protected final long estimatedTotalKeys;
protected final long maxAge;
protected final long minRepairedAt;
protected final TimeUUID pendingRepair;
protected final boolean isTransient;
protected final SSTableRewriter sstableWriter;
protected final LifecycleTransaction txn;
private final List locations;
private final List diskBoundaries;
private int locationIndex;
protected Directories.DataDirectory currentDirectory;
public CompactionAwareWriter(ColumnFamilyStore cfs,
Directories directories,
LifecycleTransaction txn,
Set nonExpiredSSTables,
boolean keepOriginals)
{
this.cfs = cfs;
this.directories = directories;
this.nonExpiredSSTables = nonExpiredSSTables;
this.txn = txn;
estimatedTotalKeys = SSTableReader.getApproximateKeyCount(nonExpiredSSTables);
maxAge = CompactionTask.getMaxDataAge(nonExpiredSSTables);
sstableWriter = SSTableRewriter.construct(cfs, txn, keepOriginals, maxAge);
minRepairedAt = CompactionTask.getMinRepairedAt(nonExpiredSSTables);
pendingRepair = CompactionTask.getPendingRepair(nonExpiredSSTables);
isTransient = CompactionTask.getIsTransient(nonExpiredSSTables);
DiskBoundaries db = cfs.getDiskBoundaries();
diskBoundaries = db.positions;
locations = db.directories;
locationIndex = -1;
}
@Override
protected Throwable doAbort(Throwable accumulate)
{
return sstableWriter.abort(accumulate);
}
@Override
protected Throwable doCommit(Throwable accumulate)
{
return sstableWriter.commit(accumulate);
}
@Override
protected void doPrepare()
{
sstableWriter.prepareToCommit();
}
/**
* we are done, return the finished sstables so that the caller can mark the old ones as compacted
* @return all the written sstables sstables
*/
@Override
public Collection finish()
{
super.finish();
return sstableWriter.finished();
}
/**
* estimated number of keys we should write
*/
public long estimatedKeys()
{
return estimatedTotalKeys;
}
/**
* Writes a partition in an implementation specific way
* @param partition the partition to append
* @return true if the partition was written, false otherwise
*/
public final boolean append(UnfilteredRowIterator partition)
{
maybeSwitchWriter(partition.partitionKey());
return realAppend(partition);
}
public final File getSStableDirectory() throws IOException
{
return getDirectories().getLocationForDisk(currentDirectory);
}
@Override
protected Throwable doPostCleanup(Throwable accumulate)
{
sstableWriter.close();
return super.doPostCleanup(accumulate);
}
protected boolean realAppend(UnfilteredRowIterator partition)
{
return sstableWriter.append(partition) != null;
}
/**
* Switches the writer if necessary, i.e. if the new key should be placed in a different data directory, or if the
* specific strategy has decided a new sstable is needed.
* Guaranteed to be called before the first call to realAppend.
*/
protected void maybeSwitchWriter(DecoratedKey key)
{
if (maybeSwitchLocation(key))
return;
if (shouldSwitchWriterInCurrentLocation(key))
switchCompactionWriter(currentDirectory, key);
}
/**
* Switches the file location and writer and returns true if the new key should be placed in a different data
* directory.
*/
protected boolean maybeSwitchLocation(DecoratedKey key)
{
if (diskBoundaries == null)
{
if (locationIndex < 0)
{
Directories.DataDirectory defaultLocation = getWriteDirectory(nonExpiredSSTables, getExpectedWriteSize());
switchCompactionWriter(defaultLocation, key);
locationIndex = 0;
return true;
}
return false;
}
if (locationIndex > -1 && key.compareTo(diskBoundaries.get(locationIndex)) < 0)
return false;
int prevIdx = locationIndex;
while (locationIndex == -1 || key.compareTo(diskBoundaries.get(locationIndex)) > 0)
locationIndex++;
Directories.DataDirectory newLocation = locations.get(locationIndex);
if (prevIdx >= 0)
logger.debug("Switching write location from {} to {}", locations.get(prevIdx), newLocation);
switchCompactionWriter(newLocation, key);
return true;
}
/**
* Returns true if the writer should be switched for reasons other than switching to a new data directory
* (e.g. because an sstable size limit has been reached).
*/
protected abstract boolean shouldSwitchWriterInCurrentLocation(DecoratedKey key);
/**
* Implementations of this method should finish the current sstable writer and start writing to this directory.
*
* Called once before starting to append and then whenever we see a need to start writing to another directory.
*
* @param directory
* @param nextKey
*/
protected void switchCompactionWriter(Directories.DataDirectory directory, DecoratedKey nextKey)
{
currentDirectory = directory;
sstableWriter.switchWriter(sstableWriter(directory, nextKey));
}
protected SSTableWriter sstableWriter(Directories.DataDirectory directory, DecoratedKey nextKey)
{
Descriptor descriptor = cfs.newSSTableDescriptor(getDirectories().getLocationForDisk(directory));
MetadataCollector collector = new MetadataCollector(txn.originals(), cfs.metadata().comparator)
.sstableLevel(sstableLevel());
SerializationHeader header = SerializationHeader.make(cfs.metadata(), nonExpiredSSTables);
return newWriterBuilder(descriptor).setMetadataCollector(collector)
.setSerializationHeader(header)
.setKeyCount(sstableKeyCount())
.build(txn, cfs);
}
/**
* Returns the level that should be used when creating sstables.
*/
protected int sstableLevel()
{
return 0;
}
/**
* Returns the key count with which created sstables should be set up.
*/
abstract protected long sstableKeyCount();
/**
* The directories we can write to
*/
public Directories getDirectories()
{
return directories;
}
/**
* Return a directory where we can expect expectedWriteSize to fit.
*
* @param sstables the sstables to compact
*/
public Directories.DataDirectory getWriteDirectory(Iterable sstables, long estimatedWriteSize)
{
Descriptor descriptor = null;
for (SSTableReader sstable : sstables)
{
if (descriptor == null)
descriptor = sstable.descriptor;
if (!descriptor.directory.equals(sstable.descriptor.directory))
{
logger.trace("All sstables not from the same disk - putting results in {}", descriptor.directory);
break;
}
}
Directories.DataDirectory d = getDirectories().getDataDirectoryForFile(descriptor);
if (d != null)
{
long availableSpace = d.getAvailableSpace();
if (availableSpace < estimatedWriteSize)
throw new RuntimeException(String.format("Not enough space to write %s to %s (%s available)",
FBUtilities.prettyPrintMemory(estimatedWriteSize),
d.location,
FBUtilities.prettyPrintMemory(availableSpace)));
logger.trace("putting compaction results in {}", descriptor.directory);
return d;
}
d = getDirectories().getWriteableLocation(estimatedWriteSize);
if (d == null)
throw new RuntimeException(String.format("Not enough disk space to store %s",
FBUtilities.prettyPrintMemory(estimatedWriteSize)));
return d;
}
public CompactionAwareWriter setRepairedAt(long repairedAt)
{
this.sstableWriter.setRepairedAt(repairedAt);
return this;
}
protected long getExpectedWriteSize()
{
return cfs.getExpectedCompactedFileSize(nonExpiredSSTables, txn.opType());
}
/**
* It is up to the caller to set the following fields:
* - {@link SSTableWriter.Builder#setKeyCount(long)},
* - {@link SSTableWriter.Builder#setSerializationHeader(SerializationHeader)} and,
* - {@link SSTableWriter.Builder#setMetadataCollector(MetadataCollector)}
*/
protected SSTableWriter.Builder newWriterBuilder(Descriptor descriptor)
{
return descriptor.getFormat().getWriterFactory().builder(descriptor)
.setTableMetadataRef(cfs.metadata)
.setTransientSSTable(isTransient)
.setRepairedAt(minRepairedAt)
.setPendingRepair(pendingRepair)
.setSecondaryIndexGroups(cfs.indexManager.listIndexGroups())
.addDefaultComponents(cfs.indexManager.listIndexGroups());
}
}