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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702536#comment-13702536
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Jack Krupansky commented on SOLR-5017:
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Will SplitShard preserve the grouping by field value? I imagine it would, but...
In other words, if an app uses a field to preserve grouping of similar
documents on the same shard, SplitShard should preserve that grouping on a
split, right?
As long as the SplitShard code knows that it is supposed to used the specified
alternative sharding field, things should be okay.
> Allow sharding based on the value of a field
> --------------------------------------------
>
> Key: SOLR-5017
> URL: https://issues.apache.org/jira/browse/SOLR-5017
> Project: Solr
> Issue Type: Sub-task
> Reporter: Noble Paul
> Assignee: Noble Paul
>
> We should be able to create a collection where sharding is done based on the
> value of a given field
> collections can be created with shardField=fieldName, which will be persisted
> in DocCollection in ZK
> implicit DocRouter would look at this field instead of _shard_ field
> CompositeIdDocRouter can also use this field instead of looking at the id
> field.
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