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From "Jesse Yates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5547) Don't delete HFiles when in "backup mode"
Date Fri, 29 Jun 2012 23:22:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404309#comment-13404309
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Jesse Yates commented on HBASE-5547:
------------------------------------

@Ted: you would still need to check the directory quite frequently or everytime you archive,
you do some extra work adding the size of the files, both of which are unpalatable. You can
get around this though by just cranking down the time between checks and then use a HFileArchiveSizeCleaner
(or something like that). I can see that being useful - file an issue?
                
> 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
>         Attachments: hbase-5447-v8.patch, hbase-5447-v8.patch, hbase-5547-v9.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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