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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5075) regionserver crashed and failover
Date Fri, 24 Feb 2012 07:22:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215458#comment-13215458
] 

Lars Hofhansl commented on HBASE-5075:
--------------------------------------

@zhiyuan.dai:
Would you mind if I uploaded your patch to "review board", it's easier to review there.
You put a lot of work into this, thanks for documentation.

I am a bit worried about maintaining an additional process on every machine (if I understand
that correctly).
                
> regionserver crashed and failover
> ---------------------------------
>
>                 Key: HBASE-5075
>                 URL: https://issues.apache.org/jira/browse/HBASE-5075
>             Project: HBase
>          Issue Type: Improvement
>          Components: monitoring, regionserver, replication, zookeeper
>    Affects Versions: 0.92.1
>            Reporter: zhiyuan.dai
>             Fix For: 0.90.5
>
>         Attachments: Degion of Failure Detection.pdf, HBase-5075-shell.patch, HBase-5075-src.patch
>
>
> regionserver crashed,it is too long time to notify hmaster.when hmaster know regionserver's
shutdown,it is long time to fetch the hlog's lease.
> hbase is a online db, availability is very important.
> i have a idea to improve availability, monitor node to check regionserver's pid.if this
pid not exsits,i think the rs down,i will delete the znode,and force close the hlog file.
> so the period maybe 100ms.

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