Package org.apache.cassandra.db.compaction

Class ShardManagerNoDisks

java.lang.Object

org.apache.cassandra.db.compaction.ShardManagerNoDisks

All Implemented Interfaces:

ShardManager

Direct Known Subclasses:

ShardManagerDiskAware

public class ShardManagerNoDisks
extends java.lang.Object
implements ShardManager

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	ShardManagerNoDisks.BoundaryTracker

Field Summary

Fields inherited from interface org.apache.cassandra.db.compaction.ShardManager

MINIMUM_TOKEN_COVERAGE

Constructor Summary

Constructors

Constructor	Description
ShardManagerNoDisks(ColumnFamilyStore.VersionedLocalRanges localRanges)

Method Summary

Modifier and Type	Method	Description
ShardTracker	boundaries(int shardCount)	Construct a boundary/shard iterator for the given number of shards.
boolean	isOutOfDate(long ringVersion)
double	localSpaceCoverage()	The total fraction of the token space covered by the local ranges.
double	rangeSpanned(Range<Token> tableRange)	The token range fraction spanned by the given range, adjusted for the local range ownership.
double	shardSetCoverage()	The fraction of the token space covered by a shard set, i.e.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.db.compaction.ShardManager

calculateCombinedDensity, compareByDensity, density, rangeSpanned, rangeSpanned

Constructor Detail

ShardManagerNoDisks

public ShardManagerNoDisks(ColumnFamilyStore.VersionedLocalRanges localRanges)

Method Detail

isOutOfDate

public boolean isOutOfDate(long ringVersion)

Specified by:

isOutOfDate in interface ShardManager

rangeSpanned

public double rangeSpanned(Range<Token> tableRange)

Description copied from interface: ShardManager

The token range fraction spanned by the given range, adjusted for the local range ownership.

Specified by:

rangeSpanned in interface ShardManager

localSpaceCoverage

public double localSpaceCoverage()

Description copied from interface: ShardManager

The total fraction of the token space covered by the local ranges.

Specified by:

localSpaceCoverage in interface ShardManager

shardSetCoverage

public double shardSetCoverage()

Description copied from interface: ShardManager

The fraction of the token space covered by a shard set, i.e. the space that is split in the requested number of shards. If no disks are defined, this is the same as localSpaceCoverage(). Otherwise, it is the token coverage of a disk.

Specified by:

shardSetCoverage in interface ShardManager

boundaries

public ShardTracker boundaries(int shardCount)

Description copied from interface: ShardManager

Construct a boundary/shard iterator for the given number of shards. Note: This does not offer a method of listing the shard boundaries it generates, just to advance to the corresponding one for a given token. The only usage for listing is currently in tests. Should a need for this arise, see CompactionSimulationTest for a possible implementation.

Specified by:

boundaries in interface ShardManager