[jira] [Commented] (HBASE-16010) Put draining function through Admin API

["Matt Warhaftig (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-16010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15326049#comment-15326049 ] 

Matt Warhaftig commented on HBASE-16010:
----------------------------------------

Proposed Admin drain methods and signatures:

Drain RegionServer:
- void drainRegionServer(final ServerName sn);

List Draining Regions:
- List<HRegionInfo> getDrainingRegions(final ServerName sn);

Clear Drain From RegionServer:
- void removeDrainFromRegionServer(final ServerName sn);
- void removeDrainFromAllRegionServers();


> 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
>
> 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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