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From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5547) Don't delete HFiles when in "backup mode"
Date Sun, 22 Jul 2012 19:43:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420293#comment-13420293
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Zhihong Ted Yu commented on HBASE-5547:
---------------------------------------

bq. Because the cleaner chain works, the TTL cleaner works (both of which are tested) and
the zk archiver cleaner works, we can then say that they work together.
If some user encounters the scenario shown in existing TestZooKeeperTableArchiveClient#testMultipleTables
and asked us on mailing list, can we go with the above answer ?
                
> 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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