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From "Yonik Seeley (JIRA)" <>
Subject [jira] [Commented] (SOLR-3755) shard splitting
Date Thu, 23 Aug 2012 21:48:41 GMT


Yonik Seeley commented on SOLR-3755:

We need to associate hash ranges with shards and allow overlapping shards (i.e. 1-10, 1-5,6-10)

General Strategy for splitting w/ no service interruptions:
 - Bring up 2 new cores on the same node, covering the new hash ranges
 - Both cores should go into recovery mode (i.e. leader should start
forwarding updates)
 - leader does a hard commit and splits the index
 - Smaller indexes are installed on the new cores
 - Overseer should create new replicas for new shards
 - Mark old shard as “retired” – some mechanism to shut it down (after there is an acceptable
amount of coverage of the new shards via replicas)

Future: allow splitting even with “custom” shards
> shard splitting
> ---------------
>                 Key: SOLR-3755
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>            Reporter: Yonik Seeley
> We can currently easily add replicas to handle increases in query volume, but we should
also add a way to add additional shards dynamically by splitting existing shards.

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