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https://issues.apache.org/jira/browse/HBASE-16010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15905501#comment-15905501
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Jerry He commented on HBASE-16010:
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I was trying to give myself more time to think, but forgot to get back to it.
Sorry about it.
The current patch provides API via master to put region servers in 'drain' mode
indicating no regions should be assigned here.
The argument is whether this JIRA should include additional work to actually
move the regions out from the affected server, again carried out on master,
thus providing a true 'decommission' feature, which is not available anywhere
yet. A rb script currently does part of the work.
I like the idea. If the contributor will extend the work, I will be glad to
help.
There was concern doing the bulk move of the regions on the master at the
moment given the ongoing work in the AM proc.
> Put draining function through Admin API
> ---------------------------------------
>
> Key: HBASE-16010
> URL: https://issues.apache.org/jira/browse/HBASE-16010
> Project: HBase
> Issue Type: Improvement
> Reporter: Jerry He
> Assignee: Jerry He
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: hbase-16010-v1.patch, hbase-16010-v2.patch,
> HBASE-16010-v3.patch
>
>
> Currently, there is no Amdin API for draining function. Client has to
> interact directly with Zookeeper draining node to add and remove draining
> servers.
> For example, in draining_servers.rb:
> {code}
> zkw = org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.new(config,
> "draining_servers", nil)
> parentZnode = zkw.drainingZNode
> begin
> for server in servers
> node = ZKUtil.joinZNode(parentZnode, server)
> ZKUtil.createAndFailSilent(zkw, node)
> end
> ensure
> zkw.close()
> end
> {code}
> This is not good in cases like secure clusters with protected Zookeeper nodes.
> Let's put draining function through Admin API.
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