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https://issues.apache.org/jira/browse/SOLR-2592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457263#comment-13457263
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Andy Laird commented on SOLR-2592:
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Michael, I've been using your patch for a few months now (since it's the only
way we can get field collapse counts to work properly for distributed queries)
and it looks like your latest thoughts are similar to the discussions earlier
(~ June 23)? If I understand correctly, all we'll need to do is add the
shardKey to our schema and we no longer will need the composite uniqueKey and
corresponding ShardKeyParsers? We'll still need to deal with the situation
where our document's shardKey field changes (to relocate the doc to a different
shard, etc.) but I see no way around that. Regarding realtime get, are you
aware of [SOLR-3133|https://issues.apache.org/jira/browse/SOLR-3133]? Just
wondering if the use of the shard.key.value parameter will help or hinder that
issue (there's not a lot of detail about why RT get doesn't work in distributed
mode and I haven't had a chance to look myself).
> 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-ALPHA
> Reporter: Noble Paul
> Assignee: Mark Miller
> Attachments: dbq_fix.patch, pluggable_sharding.patch,
> pluggable_sharding_V2.patch, SOLR-2592.patch, SOLR-2592_r1373086.patch,
> SOLR-2592_r1384367.patch, SOLR-2592_rev_2.patch,
> SOLR_2592_solr_4_0_0_BETA_ShardPartitioner.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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