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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org