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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 Mon, 05 Aug 2013 21:46:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13730002#comment-13730002
] 

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

I had seen the problem on a 0.94 live cluster. It happened when there was heavy write load
on the cluster 
while the snapshot was taken.
Later to re-create the problem, I had to suspend the compaction thread manually so that right
after region 
split the new regions would not be compacted right away.
I have not got a chance to do testing on this patch yet.

                
> 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-thz-v0.patch,
HBASE-8760-thz-v1.patch, HBASE-8760-thz-v2.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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