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Posted to dev@zookeeper.apache.org by "Michi Mutsuzaki (JIRA)" <ji...@apache.org> on 2014/05/20 00:33:38 UTC
[jira] [Commented] (ZOOKEEPER-1360)
QuorumTest.testNoLogBeforeLeaderEstablishment has several problems
[ https://issues.apache.org/jira/browse/ZOOKEEPER-1360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14002508#comment-14002508 ]
Michi Mutsuzaki commented on ZOOKEEPER-1360:
--------------------------------------------
Is this still a problem?
> QuorumTest.testNoLogBeforeLeaderEstablishment has several problems
> ------------------------------------------------------------------
>
> Key: ZOOKEEPER-1360
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1360
> Project: ZooKeeper
> Issue Type: Bug
> Components: tests
> Affects Versions: 3.4.2
> Reporter: Henry Robinson
> Assignee: Henry Robinson
> Fix For: 3.5.0
>
>
> After the apparently valid fix to ZOOKEEPER-1294, testNoLogBeforeLeaderEstablishment is failing for me about one time in four. While I'll investigate whether the patch is 1294 is ultimately to blame, reading the test brought to light a number of issues that appear to be bugs or in need of improvement:
> * As part of QuorumTest, an ensemble is already established by the fixture setup code, but apparently unused by the test which uses QuorumUtil.
> * The test reads QuorumPeer.leader and QuorumPeer.follower without synchronization, which means that writes to those fields may not be published when we come to read them.
> * The return value of sem.tryAcquire is never checked.
> * The progress of the test is based on ad-hoc timings (25 * 500ms sleeps) and inscrutable numbers of iterations through the main loop (e.g. the semaphore blocking the final asserts is released only after the 20000th of 50000 callbacks)
> * The test as a whole takes ~30s to run
> The first three are easy to fix (as part of fixing the second, I intend to hide all members of QuorumPeer behind getters and setters), the fourth and fifth need a slightly deeper understanding of what the test is trying to achieve.
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