Philip Zeyliger created HBASE-6402:
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Summary: Ability to explicitly include and exclude hosts from
cluster
Key: HBASE-6402
URL: https://issues.apache.org/jira/browse/HBASE-6402
Project: HBase
Issue Type: New Feature
Components: master
Affects Versions: 0.94.0
Reporter: Philip Zeyliger
Both MR and HDFS (see
http://hadoop.apache.org/common/docs/r0.20.0/cluster_setup.html; look for
"dfs.hosts", "dfs.hosts.exclude", "mapred.hosts", "mapred.hosts.exclude")
provide the user a way to deny certain slave daemons from joining the cluster.
The use for this is two-fold: it prevents developers with a client
configuration from joining the cluster from their laptop on accident, and it
provides a mechanism to explicitly decommission a node while it's in repair or
what-not.
A similar explicit cluster membership would be useful for HBase, for the same
reasons. Just yesterday a user found out that his organization was running
regionservers on machines that weren't supposed to be running regionservers.
It wasn't a huge deal, but this feature would make it easier for this user to
prevent the co-admins from making this mistake.
I'd note that HDFS and MR are inconsistent at the moment as to whether their
exclude files should have IPs, hostnames, or both. Clearly defining and
documenting that is useful.
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