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From "John Zhuge (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11303) Hedged read might hang infinitely if read data from all DN failed
Date Fri, 11 Aug 2017 16:55:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123625#comment-16123625
] 

John Zhuge commented on HDFS-11303:
-----------------------------------

Saw it in Aug 6 qbt:
{noformat}
For more details, see https://builds.apache.org/job/hadoop-qbt-trunk-java8-linux-x86/484/

[Aug 4, 2017 4:40:45 PM] (jzhuge) HADOOP-14471. Upgrade Jetty to latest 9.3 version. Contributed
by John
[Aug 4, 2017 5:40:52 PM] (arp) HADOOP-13963. /bin/bash is hard coded in some of the scripts.
[Aug 4, 2017 6:21:58 PM] (lei) HDFS-12251. Add document for StreamCapabilities. (Lei (Eddy)
Xu)
[Aug 4, 2017 7:51:33 PM] (arp) HDFS-12224. Add tests to TestJournalNodeSync for sync after
JN downtime.
[Aug 4, 2017 11:03:56 PM] (junping_du) YARN-6811. [ATS1.5] All history logs should be kept
under its own User
[Aug 4, 2017 11:46:59 PM] (arp) HADOOP-14685. Exclude some test jars from hadoop-client-minicluster
jar.
       hadoop.security.TestRaceWhenRelogin
       hadoop.hdfs.TestDFSStripedOutputStreamWithFailure080
       hadoop.hdfs.TestDFSStripedInputStreamWithRandomECPolicy
       hadoop.hdfs.TestRollingUpgrade
{noformat}


> 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, 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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