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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11398) TestDataNodeVolumeFailure#testUnderReplicationAfterVolFailure still fails intermittently
Date Wed, 08 Feb 2017 10:50:41 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Yiqun Lin updated HDFS-11398:
    Attachment: HDFS-11398.001.patch

> TestDataNodeVolumeFailure#testUnderReplicationAfterVolFailure still fails intermittently
> ----------------------------------------------------------------------------------------
>                 Key: HDFS-11398
>                 URL: https://issues.apache.org/jira/browse/HDFS-11398
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: failure.log, HDFS-11398.001.patch, HDFS-11398-reproduce.patch
> The test {{TestDataNodeVolumeFailure#testUnderReplicationAfterVolFailure}} still fails
intermittently in trunk after HDFS-11316. The stack infos:
> {code}
> java.util.concurrent.TimeoutException: Timed out waiting for DN to die
> 	at org.apache.hadoop.hdfs.DFSTestUtil.waitForDatanodeDeath(DFSTestUtil.java:702)
> 	at org.apache.hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureReporting.testSuccessiveVolumeFailures(TestDataNodeVolumeFailureReporting.java:218
> {code}
> I looked into this and found there is one chance that the vaule {{UnderReplicatedBlocksCount}}
will be no longer > 0. The following is my analysation:
> In test {{TestDataNodeVolumeFailure.testUnderReplicationAfterVolFailure}}, it uses creating
file to trigger the disk error checking. The related codes:
> {code}
>     Path file1 = new Path("/test1");
>     DFSTestUtil.createFile(fs, file1, 1024, (short)3, 1L);
>     DFSTestUtil.waitReplication(fs, file1, (short)3);
>     // Fail the first volume on both datanodes
>     File dn1Vol1 = new File(dataDir, "data"+(2*0+1));
>     File dn2Vol1 = new File(dataDir, "data"+(2*1+1));
>     DataNodeTestUtils.injectDataDirFailure(dn1Vol1, dn2Vol1);
>     Path file2 = new Path("/test2");
>     DFSTestUtil.createFile(fs, file2, 1024, (short)3, 1L);
>     DFSTestUtil.waitReplication(fs, file2, (short)3);
> {code}
> This will lead one problem: If the cluster is busy, and it costs long time to wait replication
of file2 to be desired value. And there is one chance that the under replication blocks of
file1 can also be rereplication in cluster. If this is done, the condition {{underReplicatedBlocks
> 0}} will never be  satisfied.
> And this can be reproduced in my local env.
> Actually, we can use a easy way {{DataNodeTestUtils.waitForDiskError}} to replace this,
it runs fast and be more reliable.

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