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From "Jerry He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8760) possible loss of data in snapshot taken after region split
Date Tue, 18 Jun 2013 22:41:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13687315#comment-13687315
] 

Jerry He commented on HBASE-8760:
---------------------------------

I agree.  A couple of options for thoughts.

Option 1:

1) Keep the parent hfle from the hfile cleaner. (the current patch).  
   The hfile will be there with the snapshot. But will be gone after delete-snapshot.
2) In RestoreSnapshotHelper.restoreReferenceFile(), change the code to either hold onto the
parent hfile, or copy the half files?
3) Take care of ExportSnapshot too.

Option 2:

1) Include the parent hfiles in the snapshot. Disregard the daughters?

Other approaches?

                
> possible loss of data in snapshot taken after region split
> ----------------------------------------------------------
>
>                 Key: HBASE-8760
>                 URL: https://issues.apache.org/jira/browse/HBASE-8760
>             Project: HBase
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 0.94.8
>            Reporter: Jerry He
>            Assignee: Jerry He
>             Fix For: 0.94.8
>
>         Attachments: HBase-8760-0.94.8.patch, HBase-8760-0.94.8-v1.patch
>
>
> Right after a region split but before the daughter regions are compacted, we have two
daughter regions containing Reference files to the parent hfiles.
> If we take snapshot right at the moment, the snapshot will succeed, but it will only
contain the daughter Reference files. Since there is no hold on the parent hfiles, they will
be deleted by the HFile Cleaner after they are no longer needed by the daughter regions soon
after.
> A minimum we need to do is the keep these parent hfiles from being deleted. 

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