org.apache.cassandra.db.compaction

Class SizeTieredCompactionStrategy

java.lang.Object

org.apache.cassandra.db.compaction.AbstractCompactionStrategy

org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy

public class SizeTieredCompactionStrategy
extends AbstractCompactionStrategy

Field Summary

Fields

Modifier and Type	Field and Description
protected int	estimatedRemainingTasks
protected SizeTieredCompactionStrategyOptions	options

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

cfs, COMPACTION_ENABLED, DEFAULT_TOMBSTONE_COMPACTION_INTERVAL, DEFAULT_TOMBSTONE_THRESHOLD, DEFAULT_UNCHECKED_TOMBSTONE_COMPACTION_OPTION, disableTombstoneCompactions, enabled, isActive, TOMBSTONE_COMPACTION_INTERVAL_OPTION, TOMBSTONE_THRESHOLD_OPTION, tombstoneCompactionInterval, tombstoneThreshold, UNCHECKED_TOMBSTONE_COMPACTION_OPTION, uncheckedTombstoneCompaction

Constructor Summary

Constructors

Constructor and Description
SizeTieredCompactionStrategy(ColumnFamilyStore cfs, java.util.Map<java.lang.String,java.lang.String> options)

Method Summary

Methods

Modifier and Type	Method and Description
static java.util.List<Pair<SSTableReader,java.lang.Long>>	createSSTableAndLengthPairs(java.lang.Iterable<SSTableReader> sstables)
static <T> java.util.List<java.util.List<T>>	getBuckets(java.util.Collection<Pair<T,java.lang.Long>> files, double bucketHigh, double bucketLow, long minSSTableSize)
int	getEstimatedRemainingTasks()
AbstractCompactionTask	getMaximalTask(int gcBefore)
long	getMaxSSTableBytes()
AbstractCompactionTask	getNextBackgroundTask(int gcBefore)
AbstractCompactionTask	getUserDefinedTask(java.util.Collection<SSTableReader> sstables, int gcBefore)
static java.util.List<SSTableReader>	mostInterestingBucket(java.util.List<java.util.List<SSTableReader>> buckets, int minThreshold, int maxThreshold)
java.lang.String	toString()
static java.util.Map<java.lang.String,java.lang.String>	validateOptions(java.util.Map<java.lang.String,java.lang.String> options)

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

disable, enable, filterSSTablesForReads, filterSuspectSSTables, getCompactionTask, getMemtableReservedSize, getScanners, getScanners, isAffectedByMeteredFlusher, isEnabled, pause, replaceFlushed, resume, shouldBeEnabled, shutdown, startup, worthDroppingTombstones

Methods inherited from class java.lang.Object

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

Field Detail

options

protected SizeTieredCompactionStrategyOptions options

estimatedRemainingTasks

protected volatile int estimatedRemainingTasks

Constructor Detail

SizeTieredCompactionStrategy

public SizeTieredCompactionStrategy(ColumnFamilyStore cfs,
                            java.util.Map<java.lang.String,java.lang.String> options)

Method Detail

mostInterestingBucket

public static java.util.List<SSTableReader> mostInterestingBucket(java.util.List<java.util.List<SSTableReader>> buckets,
                                                  int minThreshold,
                                                  int maxThreshold)

Parameters:

buckets - list of buckets from which to return the most interesting, where "interesting" is the total hotness for reads

minThreshold - minimum number of sstables in a bucket to qualify as interesting

maxThreshold - maximum number of sstables to compact at once (the returned bucket will be trimmed down to this)

Returns:

a bucket (list) of sstables to compact

getNextBackgroundTask

public AbstractCompactionTask getNextBackgroundTask(int gcBefore)

Specified by:

getNextBackgroundTask in class AbstractCompactionStrategy

Parameters:

gcBefore - throw away tombstones older than this

Returns:

the next background/minor compaction task to run; null if nothing to do. Is responsible for marking its sstables as compaction-pending.

getMaximalTask

public AbstractCompactionTask getMaximalTask(int gcBefore)

Specified by:

getMaximalTask in class AbstractCompactionStrategy

Parameters:

gcBefore - throw away tombstones older than this

Returns:

a compaction task that should be run to compact this columnfamilystore as much as possible. Null if nothing to do. Is responsible for marking its sstables as compaction-pending.

getUserDefinedTask

public AbstractCompactionTask getUserDefinedTask(java.util.Collection<SSTableReader> sstables,
                                        int gcBefore)

Specified by:

getUserDefinedTask in class AbstractCompactionStrategy

Parameters:

sstables - SSTables to compact. Must be marked as compacting.

gcBefore - throw away tombstones older than this

Returns:

a compaction task corresponding to the requested sstables. Will not be null. (Will throw if user requests an invalid compaction.) Is responsible for marking its sstables as compaction-pending.

getEstimatedRemainingTasks

public int getEstimatedRemainingTasks()

Specified by:

getEstimatedRemainingTasks in class AbstractCompactionStrategy

Returns:

the number of background tasks estimated to still be needed for this columnfamilystore

createSSTableAndLengthPairs

public static java.util.List<Pair<SSTableReader,java.lang.Long>> createSSTableAndLengthPairs(java.lang.Iterable<SSTableReader> sstables)

getBuckets

public static <T> java.util.List<java.util.List<T>> getBuckets(java.util.Collection<Pair<T,java.lang.Long>> files,
                                               double bucketHigh,
                                               double bucketLow,
                                               long minSSTableSize)

getMaxSSTableBytes

public long getMaxSSTableBytes()

Specified by:

getMaxSSTableBytes in class AbstractCompactionStrategy

Returns:

size in bytes of the largest sstables for this strategy

validateOptions

public static java.util.Map<java.lang.String,java.lang.String> validateOptions(java.util.Map<java.lang.String,java.lang.String> options)
                                                                        throws ConfigurationException

Throws:

ConfigurationException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object