John Zhuge commented on HDFS-11738:

[~zhangchen] is the original author. [~jojochuang] and I just tried to help 
move it forward.

I am ok with [~vinayrpet]'s plan since [~zhangchen]'s work in DFSInputStream 
and the new unit test deserves the credit. 

> 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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