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https://issues.apache.org/jira/browse/HDFS-11807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211232#comment-16211232
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James Clampffer commented on HDFS-11807:
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This seems to hang forever in
libhdfs_mini_stress_valgrind_hdfspp_test_shim_static - I don't see
memcheck/valgrind running and the test isn't using any CPU. During the build
the compiler complains a lot about not checking results from the read() and
write() calls to the IPC socket which makes me think the main process is stuck
waiting on the side process to say it's done.
> libhdfs++: Get minidfscluster tests running under valgrind
> ----------------------------------------------------------
>
> Key: HDFS-11807
> URL: https://issues.apache.org/jira/browse/HDFS-11807
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: James Clampffer
> Assignee: Anatoli Shein
> Attachments: HDFS-11807.HDFS-8707.000.patch
>
>
> The gmock based unit tests generally don't expose race conditions and memory
> stomps. A good way to expose these is running libhdfs++ stress tests and
> tools under valgrind and pointing them at a real cluster. Right now the CI
> tools don't do that so bugs occasionally slip in and aren't caught until they
> cause trouble in applications that use libhdfs++ for HDFS access.
> The reason the minidfscluster tests don't run under valgrind is because the
> GC and JIT compiler in the embedded JVM do things that look like errors to
> valgrind. I'd like to have these tests do some basic setup and then fork
> into two processes: one for the minidfscluster stuff and one for the
> libhdfs++ client test. A small amount of shared memory can be used to
> provide a place for the minidfscluster to stick the hdfsBuilder object that
> the client needs to get info about which port to connect to. Can also stick
> a condition variable there to let the minidfscluster know when it can shut
> down.
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