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Date: Sun, 22 Jul 2012 04:13:35 +0000 (UTC)
From: "Jesse Yates (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5547) Don't delete HFiles when in "backup
 mode"
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    [ https://issues.apache.org/jira/browse/HBASE-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420103#comment-13420103 ] 

Jesse Yates commented on HBASE-5547:
------------------------------------

Hmmm, looks like there was a NPE generated during a compaction - probably what broke the test, but its pretty early on, so maybe not. Looking into it to see what is going on... 
                
> Don't delete HFiles when in "backup mode"
> -----------------------------------------
>
>                 Key: HBASE-5547
>                 URL: https://issues.apache.org/jira/browse/HBASE-5547
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Lars Hofhansl
>            Assignee: Jesse Yates
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: 5547-v12.txt, 5547-v16.txt, hbase-5447-v8.patch, hbase-5447-v8.patch, hbase-5547-v9.patch, java_HBASE-5547_v13.patch, java_HBASE-5547_v14.patch, java_HBASE-5547_v15.patch, java_HBASE-5547_v4.patch, java_HBASE-5547_v5.patch, java_HBASE-5547_v6.patch, java_HBASE-5547_v7.patch
>
>
> This came up in a discussion I had with Stack.
> It would be nice if HBase could be notified that a backup is in progress (via a znode for example) and in that case either:
> 1. rename HFiles to be delete to <file>.bck
> 2. rename the HFiles into a special directory
> 3. rename them to a general trash directory (which would not need to be tied to backup mode).
> That way it should be able to get a consistent backup based on HFiles (HDFS snapshots or hard links would be better options here, but we do not have those).
> #1 makes cleanup a bit harder.

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