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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704608#comment-13704608
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Noble Paul commented on SOLR-5017:
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Speaking of the the best option
my 2 cents
2 routers
1) A HashDocRouter
2) An ImplicitDocRouter (or is it ExplicitRouter)
Both honors the shardField or (routeField) param . one uses the value verbatim
whereas the other uses the hash of the field value
HashDocRouter honors the special id format with "!" .
\_route_ param can be used and will be honored by all routers always in
add/update/query/getbyid et al. HashDocRouter uses the hash of the value
whereas ImplicitDocROuter uses the value verbatim
> 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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