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Posted to dev@lucene.apache.org by "Yonik Seeley (JIRA)" <ji...@apache.org> on 2016/04/10 01:12:25 UTC
[jira] [Resolved] (SOLR-8922) DocSetCollector can allocate massive
garbage on large indexes
[ https://issues.apache.org/jira/browse/SOLR-8922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yonik Seeley resolved SOLR-8922.
--------------------------------
Resolution: Fixed
Committed. Thanks Jeff!
> DocSetCollector can allocate massive garbage on large indexes
> -------------------------------------------------------------
>
> Key: SOLR-8922
> URL: https://issues.apache.org/jira/browse/SOLR-8922
> Project: Solr
> Issue Type: Improvement
> Reporter: Jeff Wartes
> Assignee: Yonik Seeley
> Attachments: SOLR-8922.patch, SOLR-8922.patch
>
>
> After reaching a point of diminishing returns tuning the GC collector, I decided to take a look at where the garbage was coming from. To my surprise, it turned out that for my index and query set, almost 60% of the garbage was coming from this single line:
> https://github.com/apache/lucene-solr/blob/94c04237cce44cac1e40e1b8b6ee6a6addc001a5/solr/core/src/java/org/apache/solr/search/DocSetCollector.java#L49
> This is due to the simple fact that I have 86M documents in my shards. Allocating a scratch array big enough to track a result set 1/64th of my index (1.3M) is also almost certainly excessive, considering my 99.9th percentile hit count is less than 56k.
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