[jira] [Commented] (HBASE-11699) Region servers exclusion list to HMaster.

["Sean Busbey (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-11699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14089992#comment-14089992 ] 

Sean Busbey commented on HBASE-11699:
-------------------------------------

Keep in mind the impact of our [invariant on zookeeper state|http://hbase.apache.org/book.html#design.invariants.zk.data] being transient.

Presuming we'd want to persist this information across zookeeper wipes, where could we persist this? Is the dataset small enough that a special file in HDFS works? Should this be stored in a special table? Can we add it to META?

> Region servers exclusion list to HMaster.
> -----------------------------------------
>
>                 Key: HBASE-11699
>                 URL: https://issues.apache.org/jira/browse/HBASE-11699
>             Project: HBase
>          Issue Type: New Feature
>          Components: Admin, Client, regionserver, Zookeeper
>    Affects Versions: 0.98.3
>            Reporter: Gomathivinayagam Muthuvinayagam
>            Priority: Minor
>             Fix For: 0.98.3
>
>   Original Estimate: 96h
>  Remaining Estimate: 96h
>
> Currently HBase does not support adding set of region servers to be in the exclusion list. So that administrators can prevent accidental startups of some region servers to join the cluster. There was initially some work done, and it is available in https://issues.apache.org/jira/browse/HBASE-3833. It was not done after that. 
> I am planning to contribute it as a patch, and I would like to do some improvements as well. Instead of storing the exclusion entries on a file, I am planning to store it on zookeeper. Can anyone suggest thoughts on this? 



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