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https://issues.apache.org/jira/browse/HDFS-11303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15836371#comment-15836371
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stack commented on HDFS-11303:
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Hey [~alicezhangchen] You got an email when Andrew made state changes to this
issue. He set its state to 'patch available' which triggered a run of the CI
system. It looks like one test failed. Do you think it related (let me trigger
a rerun... some tests are flakey and fail on occasion irregardless of what the
attached patch does). Andrew also flagged this JIRA as affecting 3.0.0-alpha1
which probably make it fit for commit as fix for next hadoop3 release.
Let me trigger another run and see how the patch does. I'll leave this issue
open another few days in the hope that someone else will chime in with a
review. Will commit whether-or-which in a day or two. Thanks for the patch.
> Hedged read might hang infinitely if read data from all DN failed
> ------------------------------------------------------------------
>
> Key: HDFS-11303
> URL: https://issues.apache.org/jira/browse/HDFS-11303
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 3.0.0-alpha1
> Reporter: Chen Zhang
> Assignee: Chen Zhang
> Attachments: HDFS-11303-001.patch
>
>
> Hedged read will read from a DN first, if timeout, then read other DNs
> simultaneously.
> If read all DN failed, this bug will cause the future-list not empty(the
> first timeout request left in list), and hang in the loop infinitely
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