ShardShuffler (server 6.6.2 API)

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

All Methods Instance Methods Abstract Methods Concrete Methods
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 Detail
  - ShardShuffler
```
public ShardShuffler()
```
- Method Detail
  - 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()).