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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 Wed, 14 Aug 2013 18:06:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739972#comment-13739972
] 

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

Hi, Matteo

>From the master and region server logs, the offline regions from snapshot were clearly
tried being brought online.
I didn't make the connection between the failures/exceptions and that.
I am very hopeful this latest patch will solve it. I will do some quick testing.
Thanks.
                
> 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
>             Fix For: 0.98.0, 0.95.2, 0.94.12
>
>         Attachments: HBase-8760-0.94.8.patch, HBase-8760-0.94.8-v1.patch, HBASE-8760-0.94-v4.patch,
HBASE-8760-0.94-v5.patch, HBASE-8760-0.94-v6.patch, HBASE-8760-thz-v0.patch, HBASE-8760-thz-v1.patch,
HBASE-8760-thz-v2.patch, HBASE-8760-thz-v3.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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