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https://issues.apache.org/jira/browse/HDFS-9565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060934#comment-15060934
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Mingliang Liu commented on HDFS-9565:
-------------------------------------
+1 (non-binding)
> TestDistributedFileSystem.testLocatedFileStatusStorageIdsTypes is flaky due
> to race condition
> ---------------------------------------------------------------------------------------------
>
> Key: HDFS-9565
> URL: https://issues.apache.org/jira/browse/HDFS-9565
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: fs, test
> Affects Versions: 3.0.0
> Environment: Jenkins
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Minor
> Attachments: HDFS-9565.001.patch
>
>
> TestDistributedFileSystem.testLocatedFileStatusStorageIdsTypes occasionally
> fails with the following error:
> https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/699/testReport/org.apache.hadoop.hdfs/TestDistributedFileSystem/testLocatedFileStatusStorageIdsTypes/
> {noformat}
> FAILED:
> org.apache.hadoop.hdfs.TestDistributedFileSystem.testLocatedFileStatusStorageIdsTypes
> Error Message:
> Unexpected num storage ids expected:<2> but was:<1>
> Stack Trace:
> java.lang.AssertionError: Unexpected num storage ids expected:<2> but was:<1>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:743)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.junit.Assert.assertEquals(Assert.java:555)
> at
> org.apache.hadoop.hdfs.TestDistributedFileSystem.testLocatedFileStatusStorageIdsTypes(TestDistributedFileSystem.java:855)
> {noformat}
> It appears that this test failed due to race condition: it does not wait for
> the file replication to finish, before checking the file's status.
> This flaky test can be fixed by using DFSTestUtil.waitForReplication()
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