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https://issues.apache.org/jira/browse/HBASE-12439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14303025#comment-14303025
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Matteo Bertozzi commented on HBASE-12439:
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{quote}What is the diagram that talks about "branch coordinators"? Does not
seem mentioned in the text.{quote}
yeah, in the text there is a passage line but nothing more: "Assuming no other
coordinator between the Master and the Region Server, the operation is sent
down to the executor (Region Server) and the Master will be responsible to
retry/resend the operation".
I was thinking at a multi-master case where each master (in the pic branch
coordinator) is responsible for a set of RSs and the root-master (in the pic
root coordinator) is doing coordination between the masters. but that's not
important, it is just an implementation detail on how the "first level" of the
procedure is implemented.
> Procedure V2
> ------------
>
> Key: HBASE-12439
> URL: https://issues.apache.org/jira/browse/HBASE-12439
> Project: HBase
> Issue Type: New Feature
> Components: master
> Affects Versions: 2.0.0
> Reporter: Matteo Bertozzi
> Assignee: Matteo Bertozzi
> Priority: Minor
> Attachments: ProcedureV2.pdf, Procedurev2Notification-Bus.pdf
>
>
> Procedure v2 (aka Notification Bus) aims to provide a unified way to build:
> * multi-steps procedure with a rollback/rollforward ability in case of
> failure (e.g. create/delete table)
> ** HBASE-12070
> * notifications across multiple machines (e.g. ACLs/Labels/Quotas cache
> updates)
> ** Make sure that every machine has the grant/revoke/label
> ** Enforce "space limit" quota across the namespace
> ** HBASE-10295 eliminate permanent replication zk node
> * procedures across multiple machines (e.g. Snapshots)
> * coordinated long-running procedures (e.g. compactions, splits, ...)
> * Synchronous calls, with the ability to see the state/result in case of
> failure.
> ** HBASE-11608 sync split
> still work in progress/initial prototype: https://reviews.apache.org/r/27703/
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