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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HBASE-7245) Recovery on failed restore.
Date Sat, 01 Dec 2012 09:30:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Matteo Bertozzi reassigned HBASE-7245:

    Assignee: Matteo Bertozzi
> Recovery on failed 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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