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PurgeFunction.java
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PurgeFunction.java
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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
* regarding copyright ownership. The ASF licenses this file
* 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.partitions;
import java.util.function.LongPredicate;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.rows.*;
import org.apache.cassandra.db.transform.Transformation;
public abstract class PurgeFunction extends Transformation<UnfilteredRowIterator>
{
private final DeletionPurger purger;
private final int nowInSec;
private final boolean enforceStrictLiveness;
private boolean isReverseOrder;
private boolean ignoreGcGraceSeconds;
public PurgeFunction(int nowInSec, int gcBefore, int oldestUnrepairedTombstone, boolean onlyPurgeRepairedTombstones,
boolean enforceStrictLiveness)
{
this.nowInSec = nowInSec;
this.purger = (timestamp, localDeletionTime) ->
!(onlyPurgeRepairedTombstones && localDeletionTime >= oldestUnrepairedTombstone)
&& (localDeletionTime < gcBefore || ignoreGcGraceSeconds)
&& getPurgeEvaluator().test(timestamp);
this.enforceStrictLiveness = enforceStrictLiveness;
}
protected abstract LongPredicate getPurgeEvaluator();
// Called at the beginning of each new partition
protected void onNewPartition(DecoratedKey partitionKey)
{
}
// Called for each partition that had only purged infos and are empty post-purge.
protected void onEmptyPartitionPostPurge(DecoratedKey partitionKey)
{
}
// Called for every unfiltered. Meant for CompactionIterator to update progress
protected void updateProgress()
{
}
// Called at the beginning of each new partition
// Return true if the current partitionKey ignores the gc_grace_seconds during compaction.
protected boolean shouldIgnoreGcGrace()
{
return false;
}
protected void setReverseOrder(boolean isReverseOrder)
{
this.isReverseOrder = isReverseOrder;
}
@Override
@SuppressWarnings("resource")
protected UnfilteredRowIterator applyToPartition(UnfilteredRowIterator partition)
{
onNewPartition(partition.partitionKey());
ignoreGcGraceSeconds = shouldIgnoreGcGrace();
setReverseOrder(partition.isReverseOrder());
UnfilteredRowIterator purged = Transformation.apply(partition, this);
if (purged.isEmpty())
{
onEmptyPartitionPostPurge(purged.partitionKey());
purged.close();
return null;
}
return purged;
}
@Override
protected DeletionTime applyToDeletion(DeletionTime deletionTime)
{
return purger.shouldPurge(deletionTime) ? DeletionTime.LIVE : deletionTime;
}
@Override
protected Row applyToStatic(Row row)
{
updateProgress();
return row.purge(purger, nowInSec, enforceStrictLiveness);
}
@Override
protected Row applyToRow(Row row)
{
updateProgress();
return row.purge(purger, nowInSec, enforceStrictLiveness);
}
@Override
protected RangeTombstoneMarker applyToMarker(RangeTombstoneMarker marker)
{
updateProgress();
boolean reversed = isReverseOrder;
if (marker.isBoundary())
{
// We can only skip the whole marker if both deletion time are purgeable.
// If only one of them is, filterTombstoneMarker will deal with it.
RangeTombstoneBoundaryMarker boundary = (RangeTombstoneBoundaryMarker)marker;
boolean shouldPurgeClose = purger.shouldPurge(boundary.closeDeletionTime(reversed));
boolean shouldPurgeOpen = purger.shouldPurge(boundary.openDeletionTime(reversed));
if (shouldPurgeClose)
{
if (shouldPurgeOpen)
return null;
return boundary.createCorrespondingOpenMarker(reversed);
}
return shouldPurgeOpen
? boundary.createCorrespondingCloseMarker(reversed)
: marker;
}
else
{
return purger.shouldPurge(((RangeTombstoneBoundMarker)marker).deletionTime()) ? null : marker;
}
}
}