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From Michael Gentry <>
Subject Re: ConcurrentPkGeneratorTest on H2
Date Thu, 28 Nov 2013 12:27:05 GMT
I see H2 as a great test/demo database, but not something used for
high-volume multi-user access or even shared persistent storage.  If
concurrent PK generation is a problem, I don't think there'd really be an
issue in going back to synchronized.


On Thu, Nov 28, 2013 at 5:33 AM, Andrus Adamchik <>wrote:

> So I was able to fix all but one unit tests running on Jenkins:
> Failed tests:
>   testConcurrentInserts(org.apache.cayenne.dba.ConcurrentPkGeneratorTest)
> John, this is your concurrent PK test … I can consistently reproduce its
> failures with H2 locally and when run in isolation from any other tests.
> From what I can gather, either we are not locking AUTO_PK_TABLE properly on
> H2 or H2 is not supporting such concurrency. So duplicate PK errors ensue
> and the test fails.
> Not sure if we should go back to synchronized PkGenerator for H2?
> (Although ideally we should figure out how to make it behave).
> A.

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