Jeff Wartes created SOLR-8922:
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Summary: 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
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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