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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-2349) Tests should use unique temporary directories
Date Fri, 26 Mar 2010 11:44:27 GMT


Robert Muir commented on LUCENE-2349:

bq. Do they have to be unique? From my understanding they only need to be unique inside one

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:
>             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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