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https://issues.apache.org/jira/browse/HDFS-11738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinayakumar B updated HDFS-11738:
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Attachment: HDFS-11738-02.patch
Updated the patch after HDFS-11708.
Please review.
> 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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