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From "Jerry He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16010) Put draining function through Admin API
Date Wed, 21 Dec 2016 21:26:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15768204#comment-15768204

Jerry He commented on HBASE-16010:

Hi, [~enis]

bq. I think we should have the ACL changes in this patch as well. Otherwise, it will get forgotten
and leave a security hole
We surely need to get the ACL in.  But let's get this JIRA with the protobuf changes in first?
 Mixing the ACL observers and the protobuf changes will probably bloat the patch and confusing.
Let me open a subtask right away and make sure it will be in.

Currently, the decommission works this way (i played with it recently.)
1. Put the server in drain mode.
2  Move the regions off with the region mover.

You think we should combine the two steps into one?

bq. "decommissioning" a server should be integral to the new assignment manager in the sense
that the core assignment should be aware of decommissioning servers. 
I think currently if a server is in drain mode, serverManager/assignment/balancer will skip
it as candidate servers.  But not sure much about the details.

> 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
>         Attachments: 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",
>   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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