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https://issues.apache.org/jira/browse/HDFS-11303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123628#comment-16123628
 ] 

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

Saw TestDecommissioningStatus failure in Jul 28 qbt:
{noformat}
For more details, see 
https://builds.apache.org/job/hadoop-qbt-trunk-java8-linux-x86/477/

[Jul 27, 2017 5:44:50 PM] (varunsaxena) YARN-5548. Use MockRMMemoryStateStore 
to reduce test failures (Bibin A
[Jul 27, 2017 6:40:45 PM] (varunsaxena) Addendum for YARN-5548. Use 
MockRMMemoryStateStore to reduce test
[Jul 27, 2017 7:02:57 PM] (shv) HDFS-11896. Non-dfsUsed will be doubled on dead 
node re-registration.
[Jul 27, 2017 8:04:50 PM] (aw) HADOOP-14692. Upgrade Apache Rat
[Jul 27, 2017 8:23:15 PM] (jitendra) HDFS-2319. Add test cases for FSshell 
-stat. Contributed by XieXianshan
[Jul 27, 2017 11:48:24 PM] (yzhang) HDFS-12190. Enable 'hdfs dfs -stat' to 
display access time. Contributed
[Jul 28, 2017 12:10:52 AM] (aajisaka) HADOOP-11875. [JDK9] Adding a second copy 
of Hamlet without _ as a
[Jul 28, 2017 6:19:39 AM] (yufei) YARN-6864. FSPreemptionThread cleanup for 
readability. (Daniel Templeton




-1 overall


The following subsystems voted -1:
       hadoop.hdfs.TestRollingUpgrade
       hadoop.hdfs.server.namenode.TestDecommissioningStatus
{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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