CMS fails to cleanly stop threads
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Key: LUCENE-2820
URL: https://issues.apache.org/jira/browse/LUCENE-2820
Project: Lucene - Java
Issue Type: Bug
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 3.1, 4.0
When you close IW, it waits for (or aborts and then waits for) all running
merges.
However, it's wait criteria is wrong -- it waits for the threads to be done w/
their merges, not for the threads to actually die.
CMS already has a sync() method, to wait for running threads, which we can call
from CMS.close. However it has a thread hazard because a MergeThread removes
itself from mergeThreads before it actually exits. So sync() is able to return
even while a merge thread is still running.
This was uncovered by LUCENE-2819 on the test case
TestCustomScoreQuery.testCustomExternalQuery, though I expect other test cases
would show it.
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