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From "John Zhuge (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-11303) Hedged read might hang infinitely if read data from all DN failed
Date Sat, 12 Aug 2017 05:40:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16124426#comment-16124426
] 

John Zhuge edited comment on HDFS-11303 at 8/12/17 5:39 AM:
------------------------------------------------------------

Committed to trunk. Committing to branch-2 once YARN-7002 is fixed.

Thanks [~zhangchen] for discovering the issue and contributing a fix, [~jojochuang] for the
review and the contribution.


was (Author: jzhuge):
Committed to trunk. Will commit to branch-2 and branch-2.8 once YARN-7002 is fixed.

Thanks [~zhangchen] for discovering the issue and contributing a fix, [~jojochuang] for the
review and the contribution.

> 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
>             Fix For: 2.9.0, 3.0.0-beta1
>
>         Attachments: HDFS-11303-001.patch, HDFS-11303-001.patch, HDFS-11303-002.patch,
HDFS-11303-002.patch, HDFS-11303.003.patch, HDFS-11303.004.patch, HDFS-11303.005.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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