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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10535) Table trash to recover table deleted by mistake
Date Fri, 14 Feb 2014 19:20:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13901815#comment-13901815

Enis Soztutar commented on HBASE-10535:

I think we should not have yet another directory for trash. Current .archive directory is
for deleted files, and we already have the TTL mechanism, so we should build trash on top
of this. A simple thing would be to move the table's HTD to the archive directory as well,
and delete that based on the same TTL. We can have the "untrash" command to retrieve from
this dir. 
Trash'ed table SHOULD NOT prevent creating tables of the same name. 

> Table trash to recover table deleted by mistake
> -----------------------------------------------
>                 Key: HBASE-10535
>                 URL: https://issues.apache.org/jira/browse/HBASE-10535
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Liu Shaohui
>            Priority: Minor
> When table is deleted, only Hfiles are moved to archives dir, table and region infos
are deleted immediately. So it's very difficult to recover tables which are deleted by mistakes.
> I think if we can introduce an table trash dir in HDFS. When the table is deleted, the
entire table dir is moved to trash dir. And after an configurable ttl,  the dir is deleted
actually. This can be done by HMaster.
> If we want to recover the deleted table, we can use a tool which moves table dir out
of trash and recovery the meta data of the table. There are many problems the recover tool
will encountered eg, parent  and daughter regions are all in the table dir. But I think this
feature is useful to handle some special cases.
> Discussions are welcomed.

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