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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, 20 Aug 2013 22:41:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13745565#comment-13745565
] 

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

Thanks Matteo and everyone!
                
> 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, 0.95.1
>            Reporter: Jerry He
>            Assignee: Matteo Bertozzi
>             Fix For: 0.98.0, 0.94.12, 0.96.0
>
>         Attachments: HBase-8760-0.94.8.patch, HBase-8760-0.94.8-v1.patch, HBASE-8760-0.94-v10.patch,
HBASE-8760-0.94-v4.patch, HBASE-8760-0.94-v5.patch, HBASE-8760-0.94-v6.patch, HBASE-8760-0.94-v7.patch,
HBASE-8760-0.94-v8-addendum.patch, HBASE-8760-0.94-v8.patch, HBASE-8760-0.94-v9.patch, HBASE-8760-thz-v0.patch,
HBASE-8760-trunk-v10.patch, HBASE-8760-trunk-v8.patch, HBASE-8760-trunk-v9.patch, HBASE-8760-v4.patch,
v4-patch-testing-0.94.zip, v4-patch-testing-0.95.2.zip
>
>
> 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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