[jira] Updated: (HBASE-3580) Remove RS from DeadServer when new instance checks in

["Ian Knome (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-3580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ian Knome updated HBASE-3580:
-----------------------------

    Attachment: HBASE-3580-Remove-RS-from-DeadServer-when-new-instance-checks-in.patch

As per conversation with jdcryans:
1. Removed the deadServerList
2. Check whether the server reporting for duty is a dead one coming back alive, and if so, update the deadserverList and remove this server. 

> 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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