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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12116) BlockReportTestBase#blockReport_08 and #blockReport_08 intermittently fail
Date Fri, 14 Jul 2017 04:41:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16086845#comment-16086845
] 

Xiao Chen commented on HDFS-12116:
----------------------------------

I should also add: one way to reproduce this failure consistently is to sleep for a few seconds
before {{printStats();}}.

> BlockReportTestBase#blockReport_08 and #blockReport_08 intermittently fail
> --------------------------------------------------------------------------
>
>                 Key: HDFS-12116
>                 URL: https://issues.apache.org/jira/browse/HDFS-12116
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 0.22.0
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HDFS-12116.01.patch, HDFS-12116.02.patch, TEST-org.apache.hadoop.hdfs.server.datanode.TestNNHandlesBlockReportPerStorage.xml
>
>
> This seems to be long-standing, but the failure rate (~10%) is slightly higher in dist-test
run in using cdh.
> In both _08 and _09 tests:
> # an attempt is made to make a replica in {{TEMPORARY}}
>  state, by {{waitForTempReplica}}.
> # Once that's returned, the test goes on to verify block reports shows correct pending
replication blocks.
> But there's a race condition. If the replica is replicated between steps #1 and #2, {{getPendingReplicationBlocks}}
could return 0 or 1, depending on how many replicas are replicated, hence failing the test.
> Failures are seen on both {{TestNNHandlesBlockReportPerStorage}} and {{TestNNHandlesCombinedBlockReport}}



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