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From "Jerry He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16010) Put draining function through Admin API
Date Mon, 13 Jun 2016 17:44:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15327817#comment-15327817
] 

Jerry He commented on HBASE-16010:
----------------------------------

Concur with Matteo. We can probably use similar API names as in the ServerManager.
We still need to write to ZK node from master, in case one master fails. Then the direct client
ZK call is still possible.

> 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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