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https://issues.apache.org/jira/browse/HDFS-4633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13613256#comment-13613256
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Sanjay Radia commented on HDFS-4633:
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In the patch the 2 comments does not match the code
> + // Forgive nodes in under 10s for this test case.
Here you changed the comment but forgot to change it again as you lowered the
time based on Arpit's feedback.
>// [Sleeping just in case the restart of the DNs completed < 2s cause
2s is the older time, you have changed it to 5sec
> TestDFSClientExcludedNodes fails sporadically if excluded nodes cache expires
> too quickly
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-4633
> URL: https://issues.apache.org/jira/browse/HDFS-4633
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client, test
> Affects Versions: 3.0.0
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Fix For: 3.0.0
>
> Attachments: HDFS-4633.1.patch, HDFS-4633.2.patch
>
>
> {{TestDFSClientExcludedNodes}} simulates failures of individual data nodes in
> the client's write pipeline and checks the client's ability to recover.
> HDFS-4246 added support for periodic "forgiveness" by caching the list of
> known bad data nodes with a periodic eviction. The test uses a 1 second
> cache expiration. This sometimes causes failed nodes to be forgiven too fast
> and violate the assumptions of the test.
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