[jira] [Assigned] (HDFS-12120) Use new block for pre-RollingUpgrade files` append requests

["Vinayakumar B (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-12120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinayakumar B reassigned HDFS-12120:
------------------------------------

    Assignee: Vinayakumar B

> Use new block for pre-RollingUpgrade files` append requests
> -----------------------------------------------------------
>
>                 Key: HDFS-12120
>                 URL: https://issues.apache.org/jira/browse/HDFS-12120
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>
> After the RollingUpgrade prepare, append on pre-RU files will re-open the same last block and makes changes to it (appending extra data, changing genstamp etc).
> These changes to the block will not be tracked in Datanodes (either in trash or via hardlinks)
> This creates problem if RollingUpgrade.Rollback is called.
> Since block state and size both changed, after rollback block will be marked corrupted.
> To avoid this, first time append on pre-RU files can be forced to write to new block itself.



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