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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-7245) Recovery on failed snapshot restore
Date Mon, 03 Dec 2012 17:22:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508872#comment-13508872
] 

Ted Yu edited comment on HBASE-7245 at 12/3/12 5:20 PM:
--------------------------------------------------------

The subject of this JIRA is w.r.t. snapshot restore. So the first two scenarios above can
be handled in separate JIRA.

The operation directive can be created in zookeeper.
                
      was (Author: yuzhihong@gmail.com):
    The subject of this JIRA is w.r.t. snapshot restore. So the first two scenarios above
can be handled in separate JIRA.

The operation directive file can be created in zookeeper.
                  
> Recovery on failed snapshot restore
> -----------------------------------
>
>                 Key: HBASE-7245
>                 URL: https://issues.apache.org/jira/browse/HBASE-7245
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client, master, regionserver, snapshots, Zookeeper
>            Reporter: Jonathan Hsieh
>            Assignee: Matteo Bertozzi
>             Fix For: hbase-6055, 0.96.0
>
>
> Restore will do updates to the file system and to meta.  it seems that an inopportune
failure before meta is completely updated could result in an inconsistent state that would
require hbck to fix.
> We should define what the semantics are for recovering from this.  Some suggestions:
> 1) Fail Forward (see some log saying restore's meta edits not completed, then gather
information necessary to build it all from fs, and complete meta edits.).
> 2) Fail backwards (see some log saying restore's meta edits not completed, delete incomplete
snapshot region entries from meta.)  
> I think I prefer 1 -- if two processes end somehow updating  (somehow the original master
didn't die, and a new one started up) they would be idempotent.  If we used 2, we could still
have a race and still be in a bad place.

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