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From "Matthew Welty (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2991) Add support for refreshNodes in master
Date Wed, 15 Sep 2010 23:53:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909949#action_12909949
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Matthew Welty commented on HBASE-2991:
--------------------------------------

@stack: Ideal outcome of a -refreshNodes op would be to compare the contents of an excludes
configuration with the current in-memory state, and if there is a conflict it should "decommission"
a regionserver and no longer allow it to participate in the cluster. In HDFS a datanode decommissioning
amounts to a period of block replication. For an HBase regionserver this may just amount to
closing itself down cleanly.

I don't think having an 'includes' list is necessary (it also breaks with the convention of
Hadoop Common), unless someone has a very odd transience issue with rogue regionservers.

> Add support for refreshNodes in master
> --------------------------------------
>
>                 Key: HBASE-2991
>                 URL: https://issues.apache.org/jira/browse/HBASE-2991
>             Project: HBase
>          Issue Type: Wish
>          Components: master
>            Reporter: Matthew Welty
>            Priority: Minor
>
> -refreshNodes capabilities should be added to bin/hbase (or to a new script called `hbaseadmin`,
if we want to maintain command name consistency) with cluster exclusion functionality similar
to the capabilities of dfsadmin and mradmin. For ease of administration, the behavior of this
option should be procedurally identical to the functions of the Hadoop Common components,
including modifying the exclusion list via a local 'excludes' configuration file and display
of excluded nodes via the web UI.
> A command overview for the behavior of -refreshNodes in dfsadmin is here:
> http://hadoop.apache.org/common/docs/current/commands_manual.html#dfsadmin
> The command overview for -refreshNodes in mradmin is here:
> http://hadoop.apache.org/common/docs/current/commands_manual.html#mradmin

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