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From "John Zhuge (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11738) Hedged pread takes more time when block moved from initial locations
Date Sat, 12 Aug 2017 03:35:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16124428#comment-16124428
] 

John Zhuge commented on HDFS-11738:
-----------------------------------

[~vinayrpet] Committed HDFS-11303.

> Hedged pread takes more time when block moved from initial locations
> --------------------------------------------------------------------
>
>                 Key: HDFS-11738
>                 URL: https://issues.apache.org/jira/browse/HDFS-11738
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>         Attachments: HDFS-11738-01.patch, HDFS-11738-02.patch
>
>
> Scenario : 
> Same as HDFS-11708.
> During Hedge read, 
> 1. First two locations fails to read the data in hedged mode.
> 2. chooseData refetches locations and adds a future to read from DN3.
> 3. after adding future to DN3, main thread goes for refetching locations in loop and
stucks there till all 3  retries to fetch locations exhausted, which consumes ~20 seconds
with exponential retry time.



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