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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Wed, 07 Nov 2012 18:34:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492575#comment-13492575
] 

Ted Yu commented on HBASE-6721:
-------------------------------

In GroupInfoManager:
{code}
+  boolean moveServers(Set<String> hostPort, String srcGroup, String dstGroup) throws
IOException;
{code}
Please add javadoc for moveServers() method.
For GroupInfoManagerImpl , indentation should be 2 spaces.
For moveServers:
{code}
+    for(String el: hostPort) {
+      foundOne = foundOne || src.removeServer(el);
+      dst.addServer(el);
{code}
If foundOne is true in the middle of the loop, would the call to src.removeServer(el) be skipped
? That would lead to server being in both groups.
                
> RegionServer Group based Assignment
> -----------------------------------
>
>                 Key: HBASE-6721
>                 URL: https://issues.apache.org/jira/browse/HBASE-6721
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Francis Liu
>            Assignee: Vandana Ayyalasomayajula
>             Fix For: 0.96.0
>
>         Attachments: HBASE-6721_94_2.patch, HBASE-6721_94_3.patch, HBASE-6721_94.patch,
HBASE-6721_94.patch, HBASE-6721-DesigDoc.pdf
>
>
> In multi-tenant deployments of HBase, it is likely that a RegionServer will be serving
out regions from a number of different tables owned by various client applications. Being
able to group a subset of running RegionServers and assign specific tables to it, provides
a client application a level of isolation and resource allocation.
> The proposal essentially is to have an AssignmentManager which is aware of RegionServer
groups and assigns tables to region servers based on groupings. Load balancing will occur
on a per group basis as well. 
> This is essentially a simplification of the approach taken in HBASE-4120. See attached
document.

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