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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10535) Table trash to recover table deleted by mistake
Date Fri, 14 Feb 2014 13:33:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13901440#comment-13901440
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Jean-Marc Spaggiari commented on HBASE-10535:
---------------------------------------------

We can also use a specific system reserved namespace like "trash:". If we do so we might not
even have to use tags. We just move the META cells into this specific namespace, then you
can create the table again in the user namespace. To restore, we "simply" move back the rows
from the "trash:" namespace to the namespace their was in initially.

2 options. For table "myspace:mytable" we can:
1) Move it under "trash:myspace:mytable"
2) Move it under "trash:mytable" and keep the namespace in a tag.

I think option 1 is better.

> 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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