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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Wed, 24 Oct 2012 16:54:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483385#comment-13483385

Ted Yu commented on HBASE-6721:

In GroupAdminEndpoint:
+     throw new IOException(
+         "The region server or the target to move found to be null.");
It would be nice to point out which parameter is null.
+        throw new DoNotRetryIOException("Group must have no associated tables.");
Include group name in the exception message.
+  public Map<String, String> listServersInTransition() throws IOException {
Return type of Map includes additional information which is not used by callers. Suggest returning
Down in GroupAdminClient:
+      for(String server: proxy.listServersInTransition().keySet()) {
+        found = found || servers.contains(server);
+      }
Can you tell me what the body is supposed to achieve ?
Back to GroupAdminEndpoint:
+  private GroupInfoManager getGroupInfoManager() {
+    return ((GroupBasedLoadBalancer)menv.getMasterServices().getAssignmentManager().getBalancer()).getGroupInfoManager();
Does GroupInfoManager belong to balancer ? The above is probably the longest indirection I
have ever seen :-)
+  private List<HRegionInfo> getOnlineRegions(String hostPort) throws IOException {
The above method is only called by listOnlineRegionsOfGroup() in a loop over online servers,
resulting in nested loop.
Please consider collapsing the nested loop into one loop.
+      LOG.error("Failed to complete GroupMoveServer with of "+h.getPlan().getServers().size()+
nit: remove ' of ' in above sentence.
> 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

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