[jira] [Commented] (SOLR-2592) Pluggable shard lookup mechanism for SolrCloud

["Lance Norskog (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-2592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13290763#comment-13290763 ] 

Lance Norskog commented on SOLR-2592:
-------------------------------------

Hash-based distribution (deterministic pseudo-randomness) is only one way to divvy up documents among shards. Another common one is date-based: each month is in a different shard. You can search recent or older without searching all shards.

If you're going to make pluggable distribution policies, why stick to hashing? Why not do the general case?


                
> 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: dbq_fix.patch, 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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