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https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490741#comment-13490741
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Andrew Purtell commented on HBASE-6721:
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Looks like the HBASE-6721_94_2 patch contains the patch on HBASE-7042 too?
MasterExec and MasterExecResult are still in the HBASE-6721_94_2 patch, please
use Exec and ExecResult and remove MasterExec and MasterExecResult and the
change to HbaseObjectWritable.
bq. moved storage of group information from hdfs to zookeeper
Nice, this moves forward in the right direction IMHO. However, I don't see
where this information is persisted into a table. Did I miss it? Because HBase
state in ZooKeeper can be cleared by administrators in some recovery scenarios,
we can't consider it persistent storage. See how the security coprocessor
handles this.
{quote}
bq. This stuff should all be pulled out into a separate package that can be put
into a Maven module like done with security in 0.94.
Isn't that a bit too much overhead?
{quote}
The patch adds group-based assignment coprocessor specific classes to the main
Master package and the main Client package. I should clarify that I didn't say
your work must be put into a separate Maven module, but rather coprocessors are
mini-applications, and should be organized as such. It is important to keep
this set of changes, distinct optional functionality, grouped together apart
from unrelated core code. Why not {{org.apache.hadoop.hbase.client.group}} and
{{org.apache.hadoop.hbase.master.group}} etc.? I hope this feedback is clearer
now.
{quote}
bq. What changes to core code remain after that?
I've updated the patch, there should be minimal and no invasive changes.
{quote}
Thanks! Much better.
Still some possible whitepsace issues though, the patch may contain mixed tabs
and spaces? Some of the formatting looks off when I view it. If you are using
Eclipse, we have a HBase formatter in dev-support/ now that may be helpful.
> 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.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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