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https://issues.apache.org/jira/browse/SOLR-4114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13540122#comment-13540122
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Mark Miller commented on SOLR-4114:
-----------------------------------
Ran into some troubles with the 'no two shards use the same index dir' check
with a git checkout - finally traced it down to checking the source attribute
from the the solrcore mbean - and when not using svn, this can be $URL. I'll
look at an alternate check to do instead.
> Collection API: Allow multiple shards from one collection on the same Solr
> server
> ---------------------------------------------------------------------------------
>
> Key: SOLR-4114
> URL: https://issues.apache.org/jira/browse/SOLR-4114
> Project: Solr
> Issue Type: New Feature
> Components: multicore, SolrCloud
> Affects Versions: 4.0
> Environment: Solr 4.0.0 release
> Reporter: Per Steffensen
> Assignee: Mark Miller
> Labels: collection-api, multicore, shard, shard-allocation
> Fix For: 4.1, 5.0
>
> Attachments:
> SOLR-4114_mocking_OverseerCollectionProcessorTest_branch_4x.patch,
> SOLR-4114.patch, SOLR-4114.patch, SOLR-4114.patch, SOLR-4114.patch,
> SOLR-4114_trunk.patch
>
>
> We should support running multiple shards from one collection on the same
> Solr server - the run a collection with 8 shards on a 4 Solr server cluster
> (each Solr server running 2 shards).
> Performance tests at our side has shown that this is a good idea, and it is
> also a good idea for easy elasticity later on - it is much easier to move an
> entire existing shards from one Solr server to another one that just joined
> the cluter than it is to split an exsiting shard among the Solr that used to
> run it and the new Solr.
> See dev mailing list discussion "Multiple shards for one collection on the
> same Solr server"
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