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https://issues.apache.org/jira/browse/LUCENE-4451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466471#comment-13466471
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Michael McCandless commented on LUCENE-4451:
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OK that's a good clue: the Threads are created as anon classes, which means
they are holding references to lots of extra stuff. Let me try making them
static classes, and explicitly null out the "stuff" when they are done
running...
> 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
>
> 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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