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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704548#comment-13704548
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Yonik Seeley commented on SOLR-5017:
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bq. Having to manually (and forever) muck up the ID field values for routing
always seemed rather odd to me.
Having to specify extra information is what seems odd to me, and greatly
complicates clients.
Say I have a basic client that wants to do a simple get by id, or a simple
delete by id. If the id no longer contains enough information to tell what
shard it's on, we need to start broadcasting gets and deletes or something.
> 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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