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https://issues.apache.org/jira/browse/HBASE-16010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796779#comment-15796779
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Jerry He commented on HBASE-16010:
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bq. Would be great to use Enis's above suggestion. Instead of
drainRegionServers*/removeDrainFromRegionServers* in functions and PBs,
decommissionRegionServers*/recommissionRegionServers* would have been better.
There is currently a slight difference between 'drain mode' and 'decommission'
from what I understand. 'decommission' uses the region mover to offload the
regions in addition to putting the server on 'drain mode', where the drain API
only does the latter.
I think we should just provide the drain API as they are in the patch. The
java doc of the API clearly stated their purpose.
Then we can have a single shell command or script that provides the convenient
'decommission' feature. A subtask was created to do that.
How does it sound? [~enis] and [~appy]
> 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: Matt Warhaftig
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: HBASE-16010-v3.patch, hbase-16010-v1.patch,
> hbase-16010-v2.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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