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From "Matt Warhaftig (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16010) Put draining function through Admin API
Date Mon, 13 Jun 2016 21:11:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15328275#comment-15328275
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Matt Warhaftig commented on HBASE-16010:
----------------------------------------

{quote}
"or was the method supposed to be a List<ServerName> getDrainingRegionServers()? which
is what the ServerManager.getDrainingServersList()?"
{quote}

Yes, you are on top of things Matteo - the method signature was changed from that preliminary
draft to return a List<ServerName> of the draining region servers.

As of 6/13 the RPC and API methods are written and closely follow the ruby script's logic.
 Am hoping to wrap up the development in the next 48 hours.

> 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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