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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11674) reserveSpaceForReplicas is not released if append request failed due to mirror down and replica recovered
Date Fri, 12 May 2017 03:04:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16007564#comment-16007564
] 

Vinayakumar B commented on HDFS-11674:
--------------------------------------

Thanks [~arpitagarwal] for confirmation.
Committed to trunk, branch-2, branch-2.8, branch-2.8.1.

Branch-2.7 have some conflicts, attaching patch for the same.

> reserveSpaceForReplicas is not released if append request failed due to mirror down and
replica recovered
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11674
>                 URL: https://issues.apache.org/jira/browse/HDFS-11674
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>            Priority: Critical
>              Labels: release-blocker
>         Attachments: HDFS-11674-01.patch, HDFS-11674-02.patch, HDFS-11674-03.patch, HDFS-11674-branch-2.7-03.patch
>
>
> Scenario:
> 1. 3 Node cluster with "dfs.client.block.write.replace-datanode-on-failure.policy"  as
DEFAULT
> Block is written with x data.
> 2. One of the Datanode, NOT the first DN, is down
> 3. Client tries to append data to block and fails since one DN is down.
> 4. calls recoverLease() on the file.
> 5. Successfull recovery happens.
> Issue:
> 1. DNs which were connected from client before encountering mirror down, will have the
reservedSpaceForReplicas incremented, BUT never decremented. 
> 2. So in long run DN's all space will be in reservedSpaceForReplicas resulting OutOfSpace
errors.



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