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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704493#comment-13704493
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Jack Krupansky commented on SOLR-5017:
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Hmmm... what happens when a document is updated and the value of this field
changes? The update request would need to go to both the "new" shard to add the
document, and the "old" shard to delete it, right?
And for atomic update when the shard field is updated to a value that hashes to
a different shard? The existing field values need to be read from the "old"
shard and then all values written to the new shard?
> 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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