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https://issues.apache.org/jira/browse/HDFS-15422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephen O'Donnell updated HDFS-15422:
-------------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

Committed from trunk down to 2.10. Thanks all for the reviews and reporting 
this issue.

> Reported IBR is partially replaced with stored info when queuing.
> -----------------------------------------------------------------
>
>                 Key: HDFS-15422
>                 URL: https://issues.apache.org/jira/browse/HDFS-15422
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Kihwal Lee
>            Assignee: Stephen O'Donnell
>            Priority: Critical
>             Fix For: 3.3.1, 3.4.0, 3.1.5, 2.10.2, 3.2.3
>
>         Attachments: HDFS-15422-branch-2.10.001.patch, 
> HDFS-15422-branch-2.10.002.patch, HDFS-15422.001.patch
>
>
> When queueing an IBR (incremental block report) on a standby namenode, some 
> of the reported information is being replaced with the existing stored 
> information.  This can lead to false block corruption.
> We had a namenode, after transitioning to active, started reporting missing 
> blocks with "SIZE_MISMATCH" as corrupt reason. These were blocks that were 
> appended and the sizes were actually correct on the datanodes. Upon further 
> investigation, it was determined that the namenode was queueing IBRs with 
> altered information.
> Although it sounds bad, I am not making it blocker 



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