org.apache.cassandra.db.commitlog.CommitLogSegmentManagerStandard Maven / Gradle / Ivy
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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,
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*/
package org.apache.cassandra.db.commitlog;
import java.io.File;
import org.apache.cassandra.db.Mutation;
import org.apache.cassandra.io.util.FileUtils;
public class CommitLogSegmentManagerStandard extends AbstractCommitLogSegmentManager
{
public CommitLogSegmentManagerStandard(final CommitLog commitLog, String storageDirectory)
{
super(commitLog, storageDirectory);
}
public void discard(CommitLogSegment segment, boolean delete)
{
segment.close();
if (delete)
FileUtils.deleteWithConfirm(segment.logFile);
addSize(-segment.onDiskSize());
}
/**
* Reserve space in the current segment for the provided mutation or, if there isn't space available,
* create a new segment. allocate() is blocking until allocation succeeds as it waits on a signal in advanceAllocatingFrom
*
* @param mutation mutation to allocate space for
* @param size total size of mutation (overhead + serialized size)
* @return the provided Allocation object
*/
public CommitLogSegment.Allocation allocate(Mutation mutation, int size)
{
CommitLogSegment segment = allocatingFrom();
CommitLogSegment.Allocation alloc;
while ( null == (alloc = segment.allocate(mutation, size)) )
{
// failed to allocate, so move to a new segment with enough room
advanceAllocatingFrom(segment);
segment = allocatingFrom();
}
return alloc;
}
/**
* Simply delete untracked segment files w/standard, as it'll be flushed to sstables during recovery
*
* @param file segment file that is no longer in use.
*/
void handleReplayedSegment(final File file)
{
// (don't decrease managed size, since this was never a "live" segment)
logger.trace("(Unopened) segment {} is no longer needed and will be deleted now", file);
FileUtils.deleteWithConfirm(file);
}
public CommitLogSegment createSegment()
{
return CommitLogSegment.createSegment(commitLog, this);
}
}