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From "Ian Knome (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3580) Remove RS from DeadServer when new instance checks in
Date Wed, 02 Mar 2011 00:56:36 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001217#comment-13001217
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Ian Knome commented on HBASE-3580:
----------------------------------

Submitted first draft of the patch. 

Will include/update necessary test cases based on review comments. 

> Remove RS from DeadServer when new instance checks in
> -----------------------------------------------------
>
>                 Key: HBASE-3580
>                 URL: https://issues.apache.org/jira/browse/HBASE-3580
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.0
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.90.2
>
>         Attachments: HBASE-3580-Remove-RS-from-DeadServer-when-new-instance-checks-in.patch
>
>
> Keeping the servers in DeadServer until it reaches some maximum isn't super friendly,
it confuses even the best of our users:
> {quote}
> 09:27 < gbowyer> Hi all, I have apparently three dead RS in my cluster, I cannot
find references to them in HDFS or in ZK, how do I still report dead RS
> 09:27 < gbowyer> also the same nodes are reported as live region servers
> {quote}
> The subtil startcode difference can be hard to catch, also this behavior differs from
0.20 (so old users get confused, like I did when debugging this problem) and it also differs
from Hadoop's handling of dead DataNodes. It was introduced in HBASE-3282.
> I think this should be improved by doing like Hadoop does, removing the RS from DeadServers
when a new instance with the same hostname+port checks in. Stack says we should do it in ServerManager.checkIsDead

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