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https://issues.apache.org/jira/browse/HDFS-9410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15003368#comment-15003368
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Xiao Chen commented on HDFS-9410:
---------------------------------
Seems [jenkins run into some docker
problems|https://builds.apache.org/job/PreCommit-HDFS-Build/13492/console].
Reattaching to trigger a new run...
> Fix all HDFS unit tests to correctly reset to sysout and syserr
> ---------------------------------------------------------------
>
> Key: HDFS-9410
> URL: https://issues.apache.org/jira/browse/HDFS-9410
> Project: Hadoop HDFS
> Issue Type: Test
> Components: HDFS
> Reporter: Xiao Chen
> Assignee: Xiao Chen
> Priority: Minor
> Attachments: HDFS-9410.001.patch, HDFS-9410.002.patch,
> HDFS-9410.003.patch
>
>
> Originally found in {{TestDFSAdminWithHA#tearDown}} where System.out.flush()
> throws an NPE.
> The cause is that if for any reason {{setUpHaCluster}} fails before storing
> {{System.out}} and {{System.err}} as member variables {{originOut}} and
> {{originErr}}, then in {{tearDown}} {{System.out}} and {{System.err}} are set
> to null. This could cause all following tests to fail when calling {{flush}}.
> This jira tries to fix all similar occurrences of this issue
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