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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702152#comment-13702152
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Noble Paul commented on SOLR-5017:
----------------------------------

Jack ,I think, I got you partially. 

Yes, docs with a same value in a field ,WILL go to the same shard

In case of 'implicit' router there is a 1:1 mapping between the field value and 
the shard

In case of compositeId router there wil be a n:1 mapping between the field 
value and the 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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