org.elasticsearch.cluster.routing

Class ShardShuffler

java.lang.Object

org.elasticsearch.cluster.routing.ShardShuffler

Direct Known Subclasses:

RotationShardShuffler

public abstract class ShardShuffler
extends Object

A shuffler for shards whose primary goal is to balance load.

Constructor Summary

Constructors

Constructor and Description
ShardShuffler()

Method Summary

Methods

Modifier and Type	Method and Description
abstract int	nextSeed() Return a new seed.
List<ShardRouting>	shuffle(List<ShardRouting> shards) Equivalent to calling shuffle(shards, nextSeed()).
abstract List<ShardRouting>	shuffle(List<ShardRouting> shards, int seed) Return a shuffled view over the list of shards.

Methods inherited from class java.lang.Object

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

Constructor Detail

ShardShuffler

public ShardShuffler()

Method Detail

nextSeed

public abstract int nextSeed()

Return a new seed.

shuffle

public abstract List<ShardRouting> shuffle(List<ShardRouting> shards,
                         int seed)

Return a shuffled view over the list of shards. The behavior of this method must be deterministic: if the same list and the same seed are provided twice, then the result needs to be the same.

shuffle

public List<ShardRouting> shuffle(List<ShardRouting> shards)

Equivalent to calling shuffle(shards, nextSeed()).