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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725615#comment-13725615
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Noble Paul commented on SOLR-5017:
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It is now possible to create a collection with an extra parameter 'routeField'
. 'implicit' router would look into that field for routing any document.The
value of the field will be the name of the shard where it belongs to.
If the collection is created with 'routeField' other routing params are not
honored
This deprecates the 'shard.keys' parameter for routing queries in favor of a
parameter called '_route_' . 'shard.keys' will continue to work for another
release , though
> 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
> Fix For: 4.5, 5.0
>
>
> 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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