org.apache.cassandra.db.compaction

Class TimeWindowCompactionController

java.lang.Object

org.apache.cassandra.db.compaction.CompactionController

org.apache.cassandra.db.compaction.TimeWindowCompactionController

All Implemented Interfaces:

java.lang.AutoCloseable

public class TimeWindowCompactionController
extends CompactionController

Field Summary

Fields inherited from class org.apache.cassandra.db.compaction.CompactionController

cfs, gcBefore

Constructor Summary

Constructors

Constructor and Description
TimeWindowCompactionController(ColumnFamilyStore cfs, java.util.Set<SSTableReader> compacting, int gcBefore, boolean ignoreOverlaps)

Method Summary

Modifier and Type	Method and Description
protected boolean	ignoreOverlaps() Is overlapped sstables ignored Control whether or not we are taking into account overlapping sstables when looking for fully expired sstables.

Methods inherited from class org.apache.cassandra.db.compaction.CompactionController

close, compactingRepaired, getColumnFamily, getFullyExpiredSSTables, getFullyExpiredSSTables, getFullyExpiredSSTables, getKeyspace, getPurgeEvaluator, maybeRefreshOverlaps, shadowSources

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TimeWindowCompactionController

public TimeWindowCompactionController(ColumnFamilyStore cfs,
                                      java.util.Set<SSTableReader> compacting,
                                      int gcBefore,
                                      boolean ignoreOverlaps)

Method Detail

ignoreOverlaps

protected boolean ignoreOverlaps()

Description copied from class: CompactionController

Is overlapped sstables ignored Control whether or not we are taking into account overlapping sstables when looking for fully expired sstables. In order to reduce the amount of work needed, we look for sstables that can be dropped instead of compacted. As a safeguard mechanism, for each time range of data in a sstable, we are checking globally to see if all data of this time range is fully expired before considering to drop the sstable. This strategy can retain for a long time a lot of sstables on disk (see CASSANDRA-13418) so this option control whether or not this check should be ignored. Do NOT call this method in the CompactionController constructor

Overrides:

ignoreOverlaps in class CompactionController

Returns:

false by default