org.apache.cassandra.db.compaction

Class CompactionController

java.lang.Object

org.apache.cassandra.db.compaction.CompactionController

All Implemented Interfaces:

java.lang.AutoCloseable

Direct Known Subclasses:

SSTableSplitter.SplitController

public class CompactionController
extends java.lang.Object
implements java.lang.AutoCloseable

Manage compaction options.

Field Summary

Fields

Modifier and Type	Field and Description
ColumnFamilyStore	cfs
int	gcBefore

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CompactionController(ColumnFamilyStore cfs, int maxValue)
	CompactionController(ColumnFamilyStore cfs, java.util.Set<SSTableReader> compacting, int gcBefore)
	CompactionController(ColumnFamilyStore cfs, java.util.Set<SSTableReader> compacting, int gcBefore, com.google.common.util.concurrent.RateLimiter limiter, CompactionParams.TombstoneOption tombstoneOption)

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	compactingRepaired()
java.lang.String	getColumnFamily()
java.util.Set<SSTableReader>	getFullyExpiredSSTables()
static java.util.Set<SSTableReader>	getFullyExpiredSSTables(ColumnFamilyStore cfStore, java.lang.Iterable<SSTableReader> compacting, java.lang.Iterable<SSTableReader> overlapping, int gcBefore) Finds expired sstables works something like this; 1.
java.lang.String	getKeyspace()
java.util.function.Predicate<java.lang.Long>	getPurgeEvaluator(DecoratedKey key)
void	maybeRefreshOverlaps()
java.lang.Iterable<UnfilteredRowIterator>	shadowSources(DecoratedKey key, boolean tombstoneOnly)

Methods inherited from class java.lang.Object

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

Field Detail

cfs

public final ColumnFamilyStore cfs

gcBefore

public final int gcBefore

Constructor Detail

CompactionController

protected CompactionController(ColumnFamilyStore cfs,
                               int maxValue)

CompactionController

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

CompactionController

public CompactionController(ColumnFamilyStore cfs,
                            java.util.Set<SSTableReader> compacting,
                            int gcBefore,
                            com.google.common.util.concurrent.RateLimiter limiter,
                            CompactionParams.TombstoneOption tombstoneOption)

Method Detail

maybeRefreshOverlaps

public void maybeRefreshOverlaps()

getFullyExpiredSSTables

public java.util.Set<SSTableReader> getFullyExpiredSSTables()

getFullyExpiredSSTables

public static java.util.Set<SSTableReader> getFullyExpiredSSTables(ColumnFamilyStore cfStore,
                                                                   java.lang.Iterable<SSTableReader> compacting,
                                                                   java.lang.Iterable<SSTableReader> overlapping,
                                                                   int gcBefore)

Finds expired sstables works something like this; 1. find "global" minTimestamp of overlapping sstables, compacting sstables and memtables containing any non-expired data 2. build a list of fully expired candidates 3. check if the candidates to be dropped actually can be dropped (maxTimestamp < global minTimestamp) - if not droppable, remove from candidates 4. return candidates.

Parameters:

cfStore -

compacting - we take the drop-candidates from this set, it is usually the sstables included in the compaction

overlapping - the sstables that overlap the ones in compacting.

gcBefore -

Returns:

getKeyspace

public java.lang.String getKeyspace()

getColumnFamily

public java.lang.String getColumnFamily()

getPurgeEvaluator

public java.util.function.Predicate<java.lang.Long> getPurgeEvaluator(DecoratedKey key)

Parameters:

key -

Returns:

a predicate for whether tombstones marked for deletion at the given time for the given partition are purgeable; we calculate this by checking whether the deletion time is less than the min timestamp of all SSTables containing his partition and not participating in the compaction. This means there isn't any data in those sstables that might still need to be suppressed by a tombstone at this timestamp.

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

compactingRepaired

public boolean compactingRepaired()

shadowSources

public java.lang.Iterable<UnfilteredRowIterator> shadowSources(DecoratedKey key,
                                                               boolean tombstoneOnly)