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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5547) Don't delete HFiles when in "backup mode"
Date Sun, 22 Jul 2012 19:04:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420271#comment-13420271
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Lars Hofhansl commented on HBASE-5547:
--------------------------------------

Addendum v1 looks good to me. I also agree that we should remove the TTL cleaner when the
ZK cleaner is tested.
Might be prudent to add an "integration test" that uses both in some manner.

One question looking at the addendum: When would the passed configuration to archiveRegion
be different from fs.getConfiguration()? It seems that should not happen; if it did other
confusion might arise.

                
> 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.addendum, java_HBASE-5547.addendum-v1, 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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