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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-698) HLog recovery is not performed after master failure
Date Tue, 07 Jul 2009 20:18:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728341#action_12728341
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Jean-Daniel Cryans commented on HBASE-698:
------------------------------------------

bq. I wonder why the code in BaseScanner was insufficient? 

It was reacting only when seeing stale data in META or ROOT so if you lost an edit in META,
you won't see it back in BaseScanner. I think BaseScanner never recovered anything ever because
we don't have appends. Now we will have the issue of recovering regions without a META entry
tho...

bq. So, j-d, why not mod BaseScanner to check zk rather than do the filesystem check? Filesystem
check is more comprehensive?

ZK won't tell you about dead region servers, only the live ones.

> HLog recovery is not performed after master failure
> ---------------------------------------------------
>
>                 Key: HBASE-698
>                 URL: https://issues.apache.org/jira/browse/HBASE-698
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: master, regionserver
>    Affects Versions: 0.1.2
>            Reporter: Clint Morgan
>            Assignee: Jean-Daniel Cryans
>            Priority: Blocker
>             Fix For: 0.20.0
>
>         Attachments: hbase-698.patch
>
>
> I have a local cluster running, and its logging to
> <hbase>/log_X.X.X.X_1213228101021_60020/
> Then I kill both master and regionserver, and restart. Looking through
> the logs I don't see anything about trying to recover from this hlog,
> it just creates a new hlog alongside the existing one (with a new
> startcode).  The older hlog seems to be ignored, and the tables
> created in the inital session are all gone.

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