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Francis Liu commented on HBASE-6721: ------------------------------------ [~yuzhih...@gmail.com] {quote} What does the value in serversInTransition map represent? {quote} It represents servers that are being moved from one group to another. {quote} Can you tell me what the body is supposed to achieve ? Back to GroupAdminEndpoint: {quote} Retrieveing the balancer during start() returns null. Thus I have to retrieve it lazily as needed. {quote} Does GroupInfoManager belong to balancer ? The above is probably the longest indirection I have ever seen {quote} We had to do this since we didn't want to touch AssignmentManager as much as possible :) > 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.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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira