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https://issues.apache.org/jira/browse/HBASE-10569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13998559#comment-13998559
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Francis Liu commented on HBASE-10569:
-------------------------------------
{quote}
I think the main motivation is the colocation of all the components that are
usually involved in a single "transaction". The
main example of this is the Assignment, which involve: Master, META, ZooKeeper.
{quote}
I see but the notion of consolidation is counter-intuitive if we want hbase to
be horizontally scalable. See the-node-that-must-not-be-named as an example.
{quote}
#1 and #2 are part of a generic notification system, which will be used to
propagate ACLs, Visibility, Quotas. (In theory the base of this system is also
the one behind the ZK-less Assignment)
{quote}
We should be able to implement a notification system without #1 and #2? Would
be good to have a doc describing and motivatiing why we need the dependency.
And why it is better than a generic version of the current approach.
{quote}
For the Horizontal scalability, I think that we are going to have Multiple
Master each one operating on its subsection of "meta" (and the notification
system). This means that you will have concurrent assignments on different
masters.
The best case is where you can fit a full table (regions metadata) on a single
master, the other case is where your table is split on multiple master which
means that operation that requires to work on the full set of regions e.g.
delete, disable, enable need some sort of coordination to provide the full
consistency that you'll get with a full table that fits on a single master.
{quote}
Yep, instead avoiding distributed coordination tasks we should make distributed
operations a first class operation.
> 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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