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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8760) possible loss of data in snapshot taken after region split
Date Thu, 15 Aug 2013 17:40:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741247#comment-13741247
] 

Lars Hofhansl commented on HBASE-8760:
--------------------------------------

QQ: Why wouldn't you continue to use to HBaseFileSystem.createNewFileOnFileSystem(...) rather
than fs.createNewFile(...)?
                
> 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-8760-0.94-v7.patch, HBASE-8760-thz-v0.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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