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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7714) allow master to exclude nodes from running region servers
Date Wed, 30 Jan 2013 00:01:13 GMT
Ming Ma created HBASE-7714:

             Summary: 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

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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