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