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https://issues.apache.org/jira/browse/LUCENE-2349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850101#action_12850101
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Robert Muir commented on LUCENE-2349:
-------------------------------------
bq. Do they have to be unique? From my understanding they only need to be
unique inside one thread.
Yes, the reason is that the parallel tests fork different JVM's (fork="yes" in
the junit task).
So the problem is just tests getting in the way of each other.
> 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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