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Date: Wed, 17 Oct 2012 03:56:03 +0000 (UTC)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-4060) TestHSync#testSequenceFileSync
 failed
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    [ https://issues.apache.org/jira/browse/HDFS-4060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477584#comment-13477584 ] 

Lars Hofhansl commented on HDFS-4060:
-------------------------------------

The sync to disk is not actually on a synchronous path as seen from the client, so there is a short race that the client returns but the metric was not updated.

See HDFS-3979, which would fix the issue, but appears to be stuck in discussion about what extra tests it would need, if any.

                
> TestHSync#testSequenceFileSync failed
> -------------------------------------
>
>                 Key: HDFS-4060
>                 URL: https://issues.apache.org/jira/browse/HDFS-4060
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Eli Collins
>              Labels: test-fail
>
> TestHSync#testSequenceFileSync failed in the pre commit run of HDFS-4055.
> {noformat}
> java.lang.AssertionError: Bad value for metric FsyncCount expected:<2> but was:<1>
> 	at org.junit.Assert.fail(Assert.java:91)
> 	at org.junit.Assert.failNotEquals(Assert.java:645)
> 	at org.junit.Assert.assertEquals(Assert.java:126)
> 	at org.junit.Assert.assertEquals(Assert.java:470)
> 	at org.apache.hadoop.test.MetricsAsserts.assertCounter(MetricsAsserts.java:228)
> 	at org.apache.hadoop.hdfs.server.datanode.TestHSync.checkSyncMetric(TestHSync.java:46)
> 	at org.apache.hadoop.hdfs.server.datanode.TestHSync.checkSyncMetric(TestHSync.java:49)
> 	at org.apache.hadoop.hdfs.server.datanode.TestHSync.testSequenceFileSync(TestHSync.java:158)
> {noformat}

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