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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Sat, 27 Apr 2013 02:18:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643472#comment-13643472
] 

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

Looks like MetaScanner.allTableRegions() returned a map where some entry has null ServerName.
There is no null check:
{code}
        ServerName serverName = HRegionInfo.getServerName(rowResult);
        regions.put(new UnmodifyableHRegionInfo(info), serverName);
{code}
After adding null check in GroupAdminEndpoint#moveTables :
{code}
      for (Map.Entry<HRegionInfo, ServerName> entry: regionMap.entrySet()) {
        if (entry.getValue() == null) continue;
{code}
TestRegionServerGroups#testTableMoveAndDrop passed reliably.
                
> 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: 0.95.1
>
>         Attachments: 6721-master-webUI.patch, HBASE-6721_8.patch, HBASE-6721_94_2.patch,
HBASE-6721_94_3.patch, HBASE-6721_94_3.patch, HBASE-6721_94_4.patch, HBASE-6721_94_5.patch,
HBASE-6721_94_6.patch, HBASE-6721_94_7.patch, HBASE-6721_94.patch, HBASE-6721_94.patch, HBASE-6721_9.patch,
HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf,
HBASE-6721_trunk.patch, HBASE-6721_trunk.patch, HBASE-6721_trunk.patch
>
>
> 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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