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https://issues.apache.org/jira/browse/HDFS-13908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617801#comment-16617801
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Íñigo Goiri commented on HDFS-13908:
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I like the change to wait the cluster to be active instead of just sleeping.
Regarding the timeout, having a timeout of 20 for something that most times 
takes 19 seconds does not make sense.
Let's also switch the timeout to 30 in addition to  [^HDFS-13908-02.patch].

> TestDataNodeMultipleRegistrations is flaky
> ------------------------------------------
>
>                 Key: HDFS-13908
>                 URL: https://issues.apache.org/jira/browse/HDFS-13908
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Íñigo Goiri
>            Assignee: Ayush Saxena
>            Priority: Major
>         Attachments: Above Timeout.rar, HDFS-13908-01.patch, 
> HDFS-13908-02.patch, Within TImeout.rar
>
>
> We have seen this issue in multiple runs:
> https://builds.apache.org/job/PreCommit-HADOOP-Build/15146/testReport/org.apache.hadoop.hdfs.server.datanode/TestDataNodeMultipleRegistrations/testClusterIdMismatchAtStartupWithHA/
> https://builds.apache.org/job/PreCommit-HADOOP-Build/15116/testReport/org.apache.hadoop.hdfs.server.datanode/TestDataNodeMultipleRegistrations/testDNWithInvalidStorageWithHA/



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