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https://issues.apache.org/jira/browse/HBASE-10569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997248#comment-13997248
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stack commented on HBASE-10569:
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bq. ...what is the benefit of having this complexity.
Complex because we need to be able to support both topologies? (The patch is
taking us toward a simpler deploy and a master state that is easier to reason
about; these is also some nice refactoring of the megalithic master and
regionserver classes).
I could buy the argument that for 1.0 we should just go w/ the old topology and
do clean switch to new layout in 2.0. I would like it to be on sooner than
this but we are short on testing as it is so one less option, is likely the way
to go.
bq. We should not do this for saving on RPC's, but actually getting rid of
master in-memory state.
This is not about saving RPCs. It is not about getting rid of master-in-memory
state either. If anything, it is about more of the cluster state being owned
by master.
bq. If we have the state in meta and only in meta, then we won't need
colocation requirements or meta-as-a-single-region.
Not sure how this would work. meta is dumb. You need an agent of some kind.
I'd like to hear more E.
This issue has gotten a bit messy ([~toffer] called it first in attached doc
saying we seem to be talking about what this issue is not about). It is
raising loads of good stuff that we need to break out and make sure it all gets
covered (I opened HBASE-11165 at Francis prompting). I could give this a pass
and add links to our 1.0 issue.
> Co-locate meta and master
> -------------------------
>
> Key: HBASE-10569
> URL: https://issues.apache.org/jira/browse/HBASE-10569
> Project: HBase
> Issue Type: Improvement
> Components: master, Region Assignment
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Fix For: 0.99.0
>
> Attachments: Co-locateMetaAndMasterHBASE-10569.pdf,
> hbase-10569_v1.patch, hbase-10569_v2.patch, hbase-10569_v3.1.patch,
> hbase-10569_v3.patch, master_rs.pdf
>
>
> I was thinking simplifying/improving the region assignments. The first step
> is to co-locate the meta and the master as many people agreed on HBASE-5487.
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