improve build system when tests hang
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Key: LUCENE-3429
URL: https://issues.apache.org/jira/browse/LUCENE-3429
Project: Lucene - Java
Issue Type: Test
Reporter: Robert Muir
Fix For: 3.5, 4.0
Currently, if tests hang in hudson it can go hung for days until we manually
kill it.
The problem is that when a hang happens its probably serious, what we want to
do (I think), is:
# time out the build.
# ensure we have enough debugging information to hopefully fix any hang.
So I think the ideal solution would be:
# add a sysprop "-D" that LuceneTestCase respects, it could default to no
timeout at all (some value like zero).
# when a timeout is set, LuceneTestCase spawns an additional timer thread for
the test class? method?
# if the timeout is exceeded, LuceneTestCase dumps all thread/stack
information, random seed information to hopefully reproduce the hang, and fails
the test.
# nightly builds would pass some reasonable -D for each test.
separately, I think we should have an "ant-level" timeout for the whole build,
in case it goes completely crazy (e.g. jvm completely hangs or something else),
just as an additional safety.
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