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https://issues.apache.org/jira/browse/SOLR-2592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284187#comment-13284187
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Michael Garski commented on SOLR-2592:
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The pluggable_sharding_V2.patch does work with the latest version of trunk, 
however I would recommend running the unit tests after applying the patch to 
verify things on your end. I am hesitant to recommend the patch for production 
use as it does change the value that is hashed from the indexed value to the 
string value of the unique id which changes the behavior of the current hashing 
if your unique id is a numeric field type.

I am using the patch with the latest from a few days ago for testing and am 
using composite unique ids (123_456_789) so I created a ShardKeyParser that 
hashes on the first id in the composite (123) and parses a clause out of a 
delete by query to route updates and deletes to the appropriate shards. In 
order to direct the query to a particular shard use the shard.keys param set to 
the value that should be hashed (123). 
                
> Pluggable shard lookup mechanism for SolrCloud
> ----------------------------------------------
>
>                 Key: SOLR-2592
>                 URL: https://issues.apache.org/jira/browse/SOLR-2592
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>    Affects Versions: 4.0
>            Reporter: Noble Paul
>         Attachments: pluggable_sharding.patch, pluggable_sharding_V2.patch
>
>
> If the data in a cloud can be partitioned on some criteria (say range, hash, 
> attribute value etc) It will be easy to narrow down the search to a smaller 
> subset of shards and in effect can achieve more efficient search.  

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