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Date: Mon, 25 Jun 2012 22:10:45 +0000 (UTC)
From: "Zhihong Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-6205) Support an option to keep data of
 dropped table for some time
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    [ https://issues.apache.org/jira/browse/HBASE-6205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400958#comment-13400958 ] 

Zhihong Ted Yu commented on HBASE-6205:
---------------------------------------

Over in HBASE-2315, Flavio proposed basing WAL on Bookkeeper.
Before WAL can have separate file system other than that used by HFiles, we should accommodate more file system choices beyond hdfs.
                
> Support an option to keep data of dropped table for some time
> -------------------------------------------------------------
>
>                 Key: HBASE-6205
>                 URL: https://issues.apache.org/jira/browse/HBASE-6205
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.94.0, 0.96.0
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>             Fix For: 0.96.0
>
>         Attachments: HBASE-6205.patch, HBASE-6205v2.patch, HBASE-6205v3.patch, HBASE-6205v4.patch, HBASE-6205v5.patch
>
>
> User may drop table accidentally because of error code or other uncertain reasons.
> Unfortunately, it happens in our environment because one user make a mistake between production cluster and testing cluster.
> So, I just give a suggestion, do we need to support an option to keep data of dropped table for some time, e.g. 1 day
> In the patch:
> We make a new dir named .trashtables in the rood dir.
> In the DeleteTableHandler, we move files in dropped table's dir to trash table dir instead of deleting them directly.
> And Create new class TrashCleaner which will clean dropped tables if it is time out with a period check.
> Default keep time for dropped tables is 1 day, and check period is 1 hour.

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