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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11164) Mover should avoid unnecessary retries if the block is pinned
Date Wed, 14 Dec 2016 01:17:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G updated HDFS-11164:
---------------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 3.0.0-alpha2
           Status: Resolved  (was: Patch Available)

I have just committed this to trunk. 

> Mover should avoid unnecessary retries if the block is pinned
> -------------------------------------------------------------
>
>                 Key: HDFS-11164
>                 URL: https://issues.apache.org/jira/browse/HDFS-11164
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>             Fix For: 3.0.0-alpha2
>
>         Attachments: HDFS-11164-00.patch, HDFS-11164-01.patch, HDFS-11164-02.patch, HDFS-11164-03.patch
>
>
> When mover is trying to move a pinned block to another datanode, it will internally hits
the following IOException and mark the block movement as {{failure}}. Since the Mover has
{{dfs.mover.retry.max.attempts}} configs, it will continue moving this block until it reaches
{{retryMaxAttempts}}. If the block movement failure(s) are only due to block pinning, then
retry is unnecessary. The idea of this jira is to avoid retry attempts of pinned blocks as
they won't be able to move to a different node. 
> {code}
> 2016-11-22 10:56:10,537 WARN org.apache.hadoop.hdfs.server.balancer.Dispatcher: Failed
to move blk_1073741825_1001 with size=52 from 127.0.0.1:19501:DISK to 127.0.0.1:19758:ARCHIVE
through 127.0.0.1:19501
> java.io.IOException: Got error, status=ERROR, status message opReplaceBlock BP-1772076264-10.252.146.200-1479792322960:blk_1073741825_1001
received exception java.io.IOException: Got error, status=ERROR, status message Not able to
copy block 1073741825 to /127.0.0.1:19826 because it's pinned , copy block BP-1772076264-10.252.146.200-1479792322960:blk_1073741825_1001
from /127.0.0.1:19501, reportedBlock move is failed
> 	at org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:118)
> 	at org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.receiveResponse(Dispatcher.java:417)
> 	at org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.dispatch(Dispatcher.java:358)
> 	at org.apache.hadoop.hdfs.server.balancer.Dispatcher$PendingMove.access$5(Dispatcher.java:322)
> 	at org.apache.hadoop.hdfs.server.balancer.Dispatcher$1.run(Dispatcher.java:1075)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:745)
> {code}



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