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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5075) regionserver crashed and failover
Date Fri, 17 Feb 2012 17:19:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210386#comment-13210386
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Lars Hofhansl commented on HBASE-5075:
--------------------------------------

I would 2nd Stack's request to create a patch without the format changes, also there're some
author tags in the javadoc (which we don't do with Apache code).

Is this guarding against just the RegionServer process dying (but its machine still up), or
also against the machine dying? (I know I could take a closer look at the patch, but it's
easier if you just tell me) :)

                
> 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: 5075.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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