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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5075) regionserver crashed and failover
Date Sun, 26 Feb 2012 00:25:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13216589#comment-13216589
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Lars Hofhansl commented on HBASE-5075:
--------------------------------------

On 2nd thought. The ephemeral node can only be deleted as long as the ZK connection is active,
which is by no means guaranteed for any shutdown hook, also not sure about causing network
IO from a shutdown hook.

Looking at the HRegion.run() it looks like we pretty much in all cases reach the point where
deleteMyEphemeralNode is called. Hmm...
                
> 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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