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Julian Hyde commented on CALCITE-3965: -------------------------------------- I agree, very likely a duplicate of 3517. Please fix 3517, CPU use will go way down, and lock contention will reduce. Lock contention is just a symptom, not the cause. > Excessive time waiting on DiffRepository lock > --------------------------------------------- > > Key: CALCITE-3965 > URL: https://issues.apache.org/jira/browse/CALCITE-3965 > Project: Calcite > Issue Type: Bug > Components: core > Reporter: Laurent Goujon > Assignee: Laurent Goujon > Priority: Major > > When running the whole test suite from commandline, tests are parallelized > and gradle/junit tries to use as many cores as possible (16 on my machine). > But the tests take a very long time, approximatevely 90minutes on my machine, > and several of them failed because they took too long to complete. > Using jstack to look at the threads state while tests are running show that > most of them are waiting on {{DiffRepository}} methods > ({{DiffRepository#expand}} in most cases) while one of the thread obtained > the lock (and is usually flushing data on disk). -- This message was sent by Atlassian Jira (v8.3.4#803005)