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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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