costya
December 29, 2014, 11:48am
1
Hi,
I would like to predict the shards routing of a set of keys as a function
How can i check which hash function is used for routing ? and how can i
Thanks,
--elasticsearch+unsubscribe@googlegroups.com .https://groups.google.com/d/msgid/elasticsearch/8410c34e-5ad7-4b6b-89b9-7cbf758010eb%40googlegroups.com .https://groups.google.com/d/optout .
jprante
December 29, 2014, 3:18pm
2
For ES 1.4, see
}
protected IndexShardRoutingTable shards(ClusterState clusterState, String index, int shardId) {
IndexShardRoutingTable indexShard = indexRoutingTable(clusterState, index).shard(shardId);
if (indexShard == null) {
throw new IndexShardMissingException(new ShardId(index, shardId));
}
return indexShard;
}
private int shardId(ClusterState clusterState, String index, String type, @Nullable String id, @Nullable String routing) {
if (routing == null) {
if (!useType) {
return Math.abs(hash(id) % indexMetaData(clusterState, index).numberOfShards());
} else {
return Math.abs(hash(type, id) % indexMetaData(clusterState, index).numberOfShards());
}
}
return Math.abs(hash(routing) % indexMetaData(clusterState, index).numberOfShards());
}
and the hash function is
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package org.elasticsearch.cluster.routing.operation.hash.djb;
show original
Note, the hash function will change in ES 2.0.
You can not check from outside what hash function ES uses, this is internal
Jörg
On Mon, Dec 29, 2014 at 12:48 PM, Costya Regev costya@totango.com wrote:
Hi,
I would like to predict the shards routing of a set of keys as a
How can i check which hash function is used for routing ? and how can i
Thanks,
--elasticsearch+unsubscribe@googlegroups.com .https://groups.google.com/d/msgid/elasticsearch/8410c34e-5ad7-4b6b-89b9-7cbf758010eb%40googlegroups.com https://groups.google.com/d/msgid/elasticsearch/8410c34e-5ad7-4b6b-89b9-7cbf758010eb%40googlegroups.com?utm_medium=email&utm_source=footer https://groups.google.com/d/optout .
--elasticsearch+unsubscribe@googlegroups.com .https://groups.google.com/d/msgid/elasticsearch/CAKdsXoGLciGr6QEKDy_PLAU2v68aXNGHXf5gmN1w9Xb8aq%2BtnQ%40mail.gmail.com .https://groups.google.com/d/optout .