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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9347) Invariant assumption in TestQuorumJournalManager.shutdown() is wrong
Date Mon, 16 Nov 2015 14:50:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15006739#comment-15006739
] 

Wei-Chiu Chuang commented on HDFS-9347:
---------------------------------------

Thanks for the comment. My rev01 patch did use waitFor() to wait for all IPC client threads
to be destroyed. I still kept assertNoThreadsMatching() but this is actually not needed (just
to test for regressions)

> Invariant assumption in TestQuorumJournalManager.shutdown() is wrong
> --------------------------------------------------------------------
>
>                 Key: HDFS-9347
>                 URL: https://issues.apache.org/jira/browse/HDFS-9347
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>         Attachments: HDFS-9347.001.patch
>
>
> The code
> {code:title=TestTestQuorumJournalManager.java|borderStyle=solid}
> @After
>   public void shutdown() throws IOException {
>     IOUtils.cleanup(LOG, toClose.toArray(new Closeable[0]));
>     
>     // Should not leak clients between tests -- this can cause flaky tests.
>     // (See HDFS-4643)
>     GenericTestUtils.assertNoThreadsMatching(".*IPC Client.*");
>     
>     if (cluster != null) {
>       cluster.shutdown();
>     }
>   }
> {code}
> implicitly assumes when the call returns from IOUtils.cleanup() (which calls close()
on QuorumJournalManager object), all IPC client connection threads are terminated. However,
there is no internal implementation that enforces this assumption. Even if the bug reported
in HADOOP-12532 is fixed, the internal code still only ensures IPC connections are terminated,
but not the thread.



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