Package org.elasticsearch.cluster.routing

Class ShardShuffler

java.lang.Object
org.elasticsearch.cluster.routing.ShardShuffler
Direct Known Subclasses:
RotationShardShuffler
public abstract class ShardShuffler
extends java.lang.Object
A shuffler for shards whose primary goal is to balance load.

  • Constructor Summary

    Constructors 
    Constructor Description
    ShardShuffler()  

  • Method Summary

    Modifier and Type Method Description
    abstract int nextSeed()
    Return a new seed.
    java.util.List<ShardRouting> shuffle​(java.util.List<ShardRouting> shards)
    Equivalent to calling shuffle(shards, nextSeed()).
    abstract java.util.List<ShardRouting> shuffle​(java.util.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 Details

  • Method Details

    • nextSeed

      public abstract int nextSeed()
      Return a new seed.

    • shuffle

      public abstract java.util.List<ShardRouting> shuffle​(java.util.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 java.util.List<ShardRouting> shuffle​(java.util.List<ShardRouting> shards)
      Equivalent to calling shuffle(shards, nextSeed()).