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From "Russell Black (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-3109) group=true requests result in numerous redundant shard requests
Date Wed, 08 Feb 2012 05:27:00 GMT
group=true requests result in numerous redundant shard requests
---------------------------------------------------------------

                 Key: SOLR-3109
                 URL: https://issues.apache.org/jira/browse/SOLR-3109
             Project: Solr
          Issue Type: Bug
          Components: search
    Affects Versions: 3.5, 4.0
         Environment: 64-bit Linux, sharded environment
            Reporter: Russell Black
            Priority: Critical


During the second phase of a group query, the collator sends a query to each of the shards.
 The purpose of this query is for shards to respond with the doc ids that match the set of
group ids returned from the first phase.  The problem is that it sends this second query to
each shard multiple times.  Specifically, in an environment with n shards, each shard will
be hit with an identical query n times during the second phase of query processing, resulting
in O(_n_ ^2^) performance where _n_ is the number of shards.

I have traced this bug down to a single line in {{TopGroupsShardRequestFactory.java}}, and
I am attaching a patch. 

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