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https://issues.apache.org/jira/browse/SOLR-3755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440698#comment-13440698
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Yonik Seeley edited comment on SOLR-3755 at 8/29/12 6:51 AM:
-------------------------------------------------------------
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)
- leaders either need to consider these new smaller shards as replicas, or
they need to forward to the "leader" for the new smaller shard
- searches should no longer go across all shards, but should just span the
complete hash range
- 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
was (Author: ysee...@gmail.com):
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: https://issues.apache.org/jira/browse/SOLR-3755
> 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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