Laurent Goujon created CALCITE-3965:
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Summary: 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
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).
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