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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11032) [SPS]: Handling of block movement failure at the coordinator datanode
Date Fri, 23 Dec 2016 00:54:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15771512#comment-15771512
] 

Uma Maheswara Rao G commented on HDFS-11032:
--------------------------------------------

+1 on the patch. Changes looks good to me.

> [SPS]: Handling of block movement failure at the coordinator datanode
> ---------------------------------------------------------------------
>
>                 Key: HDFS-11032
>                 URL: https://issues.apache.org/jira/browse/HDFS-11032
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>         Attachments: HDFS-11032-HDFS-10285-00.patch, HDFS-11032-HDFS-10285-01.patch
>
>
> The idea of this jira is to discuss and implement an efficient failure(block movement
failure) handling logic at the datanode cooridnator.  [Code reference|https://github.com/apache/hadoop/blob/HDFS-10285/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/StoragePolicySatisfyWorker.java#L243].
> Following are the possible errors during block movement:
> # Block pinned - no retries marked as success/no-retry to NN. It is not possible to relocate
this block to another datanode.
> # Network errors(IOException) - no retries maked as failure/retry to NN.
> # No disk space(IOException) - no retries maked as failure/retry to NN.
> # Gen_Stamp mismatches - no retries marked as failure/retry to NN. Could be a case that
the file might have re-opened.



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