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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704614#comment-13704614
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Yonik Seeley commented on SOLR-5017:
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bq. 2) An ImplicitDocRouter (or is it ExplicitRouter)
It's implicit if the target shard is implicitly defined by what shard received
the update.
It's explicit if you give it an explicit value (which makes the name "implicit"
kind of not-so-good at that point). We could change the name of that too if we
want (and make it so that "implicit" still works as an alias for back compat).
> 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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