[jira] [Resolved] (HDFS-4648) For snapshot deletion, when merging the diff from to-delete snapshot to the prior snapshot, make sure files/directories created after the prior snapshot get deleted

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-4648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE resolved HDFS-4648.
------------------------------------------

       Resolution: Fixed
    Fix Version/s: Snapshot (HDFS-2802)

I have committed this.  Thanks Jing!
                
> For snapshot deletion, when merging the diff from to-delete snapshot to the prior snapshot, make sure files/directories created after the prior snapshot get deleted
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4648
>                 URL: https://issues.apache.org/jira/browse/HDFS-4648
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>             Fix For: Snapshot (HDFS-2802)
>
>         Attachments: HDFS-4648.001.patch
>
>
> When the following steps happen:
> 1. Take snapshot s1 on dir.
> 2. Create new dir and files under subDir, which is descendant of dir.
> 3. Take snapshot s2 on dir.
> 4. Delete subDir.
> 5. Delete snapshot s2.
> When we merge the diff from s2 to s1 (since we deleted s2), we need to make
> sure all the files/dirs created after s1 should be destroyed. Otherwise
> if these files/dirs are saved to the fsimage, we will have FileNotFound Exception while loading fsimage.

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