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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12724) Add retry logic when data node block moves while reading
Date Tue, 02 Jan 2018 20:42:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308675#comment-16308675
] 

James Clampffer commented on HDFS-12724:
----------------------------------------

[~mdeepak] Can you update/extend the unit test output for match this patch?  Right now BadDatanodeTest
won't pass because some of the things that used to return true in ShouldExclude now only happen
in ShouldExcludeEphemeral.

> Add retry logic when data node block moves while reading
> --------------------------------------------------------
>
>                 Key: HDFS-12724
>                 URL: https://issues.apache.org/jira/browse/HDFS-12724
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: Deepak Majeti
>            Assignee: Deepak Majeti
>         Attachments: HDFS-12724.HDFS-8707.000.patch
>
>
> It is possible for a data node block to move due to re-balance.
> Libhdfs++ must try a replica block when a block re-balance happens while reading data
from that block.



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