[jira] [Resolved] (HBASE-7714) allow master to exclude nodes from running region servers

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-7714?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Kyle Purtell resolved HBASE-7714.
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    Resolution: Incomplete

> allow master to exclude nodes from running region servers
> ---------------------------------------------------------
>
>                 Key: HBASE-7714
>                 URL: https://issues.apache.org/jira/browse/HBASE-7714
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ming Ma
>            Priority: Major
>
> Want to bring up this requirement to get people's opinion. It can be done inside hbase or at higher hadoop management layer.
> To support our clusters, we want to make sure RS doesn't run on certain nodes by accident: a) either because it is a bad machine with slow NIC card, or b) we don't want HBase to take away resource from other services. HDFS and MR have exclude files to support this.
> Currently master doesn't specify the RS membership; any machine as long as it has connectivity and security credential can connect to the master.
> There are two ways to address this requirement.
> 1. Modify hbase to allow master have a say on the RS membership. If a machine is added to hbase exclude file, master will try to migrate the regions from that machine and ask RS to go away after it is done. 
> 2. Make no change to hbase. Have some external hadoop management layer handle that.
> We have been supporting our clusters using exclude files at HDFS and MR layer to handle machine decomission and recommission. So I prefer #1.
> Any comments on this?



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