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From "ronghai.ma (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5075) regionserver crashed and failover
Date Tue, 28 Feb 2012 00:49:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217755#comment-13217755
] 

ronghai.ma commented on HBASE-5075:
-----------------------------------

If we wanna HA, it is a long time for 1s.
The scenario is in individual machine, check the HRegionServer in less than 1000ms.
It is not enough for only shell script, My solution is : a tiny c/as program monitor the HRegionServer
in less than 1000ms, and a shell script (using loop/in crontab) to monitor c/as program.
Also if we wanna more, we can use MC Serviceguard like etc.
                
> 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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