Does Elasticsearch ensures that all the replica shards are distributed in other data nodes?


(Melvilgit) #1

Does Elasticsearch automatically ensures that all the replica shards are distributed in other data nodes irrespective of the number of shards and no of data nodes ?

Say I have 3 ES nodes and For an Index A , I have 10 shards,
Assuming the primary shards is Distributed uniformly in 3 ES Boxes
My question is Does Elasticsearch distributes the replica shards of the 10 primary shards in such a way that If any of the box out of the 3 ES Nodes went down , the data loss won't happens ?


(Christian Dahlqvist) #2

Yes, a replica shard will never be allocated to the same node as the corresponding primary shard.


(Melvilgit) #3

So If I have X number of Data Nodes and Y no of Shards with Z No of Replication Factor ,
ES guarantees Failure of Any Boxes in X won't causes any data loss ?

To be clear ,Say If I have 3 Nodes and 4 shard for my index , Then then the primary and replica shard will
be distributed as below [p - Primary Shard and r-Replica Shard ]

Node 1 - [p1, r2 , r4 ] Node 2 =[p2 , r3] Node 3 - [p3 , p4 , r1 ] ,
So that failure of any nodes won't cause chaos !


(system) #4

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