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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13703236#comment-13703236
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Jack Krupansky commented on SOLR-5017:
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bq. Not sure what you mean by "explicit routing"
I mean where the user has placed a prefix and "!" in front of a key value.
Granted, it isn't explicitly stating the shard, and is really simply a
"surrogate" key value to use for sharding. Is there better terminology for the
fact that they used the "!" notation?
Question for Noble: If a shard field is specified and there is a "!" on a
document key, which takes precedence?
> 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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