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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5547) Don't delete HFiles when in "backup mode"
Date Wed, 18 Apr 2012 19:46:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256887#comment-13256887
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Zhihong Yu commented on HBASE-5547:
-----------------------------------

Currently we have the following in enable():
{code}
    // then add the table to the list of znodes to archive
    String tableNode = getTableNode(zooKeeper, table);
    ZKUtil.createSetData(zooKeeper, tableNode, archive);
{code}
If we encode the backup mode in the data associated with the table node, the region servers
would be able to register watcher for the table nodes (under zooKeeper.archiveHFileZNode).
This way region servers would get notification from zk about whether backup mode is effective.
                
> 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
>
> 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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