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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 14:08:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728112#action_12728112
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Jean-Daniel Cryans commented on HBASE-698:
------------------------------------------

In HBASE-1143 we set a very low flush size on .META. to make it flush after every ~10 updates
which lessens the impact of a lost hlog. So the original situation can still happen in the
way it is described or if a table split was done and that the region server holding META died
pretty much right after that (because either a flush will happen or after 1 hour we will roll
the commit log ). The hole is there but it's very small. The only thing missing is appends
now. We could punt this to 0.21.0, unless someone votes for a hlog ZK orchestration for 0.20.0.


> 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
>
>
> 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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