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https://issues.apache.org/jira/browse/LUCENE-4451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467129#comment-13467129
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Dawid Weiss commented on LUCENE-4451:
-------------------------------------
Thanks Mike. If you're looking into OOMs with YourKit then try to save a
differential snapshot - this helps greatly in analysis typically. Also, keep
those snapshots if you think something in the runner may be the cause (I have
YourKit as well).
> Memory leak per unique thread caused by RandomizedContext.contexts static map
> -----------------------------------------------------------------------------
>
> Key: LUCENE-4451
> URL: https://issues.apache.org/jira/browse/LUCENE-4451
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Dawid Weiss
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4451.patch
>
>
> In digging on the hard-to-understand OOMEs with
> TestDirectPostingsFormat ... I found (thank you YourKit) that
> RandomizedContext (in randomizedtesting JAR) seems to be holding onto
> all threads created by the test. The test does create many very short
> lived threads (testing the thread safety of the postings format), in
> BasePostingsFormatTestCase.testTerms), and somehow these seem to tie
> up a lot (~100 MB) of RAM in RandomizedContext.contexts static map.
> For now I've disabled all thread testing (committed {{false &&}} inside
> {{BPFTC.testTerms}}), but hopefully we can fix the root cause here, eg
> when a thread exits can we clear it from that map?
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