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Date: Wed, 14 Oct 2009 15:58:31 -0700 (PDT)
From: "Konstantin Boudnik (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-706) Intermittent failures in TestFiHFlush
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    [ https://issues.apache.org/jira/browse/HDFS-706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765802#action_12765802 ] 

Konstantin Boudnik commented on HDFS-706:
-----------------------------------------

The failing tests are one of hFlushFi0[1-3]_a. Test cases failing with the following diagnostics:
{noformat}
FI: hFlushFi02_a, index=1, datanode=127.0.0.1:53701
org.apache.hadoop.util.DiskChecker$DiskErrorException: FI: hFlushFi02_a, index=1, datanode=127.0.0.1:53701
        at org.apache.hadoop.fi.FiHFlushTestUtil$DerrAction.run(FiHFlushTestUtil.java:55)
        at org.apache.hadoop.fi.FiHFlushTestUtil$DerrAction.run(FiHFlushTestUtil.java:1)
        at org.apache.hadoop.fi.FiTestUtil$ActionContainer.run(FiTestUtil.java:66)
        at org.apache.hadoop.hdfs.HFlushAspects.ajc$after$org_apache_hadoop_hdfs_HFlushAspects$1$5141da0e(HFlushAspects.aj:54)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.hflush(DFSClient.java:3515)
        at org.apache.hadoop.hdfs.TestHFlush.doTheJob(TestHFlush.java:112)
        at org.apache.hadoop.hdfs.TestFiHFlush.runDiskErrorTest(TestFiHFlush.java:53)
        at org.apache.hadoop.hdfs.TestFiHFlush.hFlushFi02_a(TestFiHFlush.java:109)
{noformat}
Index of an exception might differ. {{_a}} tests are writing a file where {{write()}} operation stays within a block boundary. {{write()}} is followed by {{hflush()}} call. 
{{hflush()}} has an injected fault, which throws {{DiskErrorException}} on one of the pipeline's nodes. If pipeline doesn't exist then the exception won't be thrown. Which was the case for these tests since the implementation of {{hflush()}}. 

Something has changed apparently. 

> Intermittent failures in TestFiHFlush
> -------------------------------------
>
>                 Key: HDFS-706
>                 URL: https://issues.apache.org/jira/browse/HDFS-706
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Konstantin Boudnik
>
> Running tests on a Linux box I've started seeing intermittent failures among TestFiHFlush test cases. 
> It turns out that occasional failures are observed on my laptop running BSD

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