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https://issues.apache.org/jira/browse/LUCENE-2349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850201#action_12850201
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Robert Muir commented on LUCENE-2349:
-------------------------------------
bq. But will a core test and it's backwards version conflict? Or we use
different subdir for backwards?
it appears they use different directories, but this doesn't matter anyway.
parallelization is only within a single "batch": e.g. core, a single contrib,
or backwards.
the testing process is still sequential:
* run core tests in parallel
* for each contrib in sequential order, run its tests in parallel
* run backwards tests in parallel
> Tests should use unique temporary directories
> ---------------------------------------------
>
> Key: LUCENE-2349
> URL: https://issues.apache.org/jira/browse/LUCENE-2349
> Project: Lucene - Java
> Issue Type: Test
> Components: Build
> Affects Versions: 3.1
> Reporter: Robert Muir
>
> We cannot safely use parallel tests (LUCENE-1709) because some test classes
> try to use temporary directories with the same name.
> So if these two happen to run at the same time, they conflict.
> For example TestIndexReader has code like this:
> {code}
> File dirFile = new File(TEMP_DIR, "testIndex");
> {code}
> But TestCompoundFile has similar code:
> {code}
> File file = new File(TEMP_DIR, "testIndex");
> {code}
> If both these classes run at the same time, there will be problems.
> If we want to use parallel tests safely, we have to fix this use of the
> static TEMP_DIR which does not include any unique name of the test.
> Ideally we can do this without changing a lot of test code, especially
> backwards.
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