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https://issues.apache.org/jira/browse/HBASE-19216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16283178#comment-16283178
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Duo Zhang commented on HBASE-19216:
-----------------------------------
I planned to implement a general framework and also a test procedure to show
that the framework is OK. But finally I found that we have different queues in
MasterProcedureScheduler, and both of ServerQueue and TableQueue can not
represent the operations like peer state change, and it is weird to add a
'test' queue type to it.
So I plan to convert HBASE-19397 to a top level issue, and change the title of
this issue to 'Master side change of peer state change procedure' and make it a
sub task, and create another sub task for [~openinx]'s RS side change.
Since the feature can only be implemented after both issues are resolved, I
plan to create a feature branch HBASE-19397, and merge it back after the two
sub-tasks are both resolved.
Thanks.
> Implement a general framework to execute remote procedure on RS
> ---------------------------------------------------------------
>
> Key: HBASE-19216
> URL: https://issues.apache.org/jira/browse/HBASE-19216
> Project: HBase
> Issue Type: Improvement
> Reporter: Duo Zhang
>
> When building the basic framework for HBASE-19064, I found that the
> enable/disable peer is built upon the watcher of zk.
> The problem of using watcher is that, you do not know the exact time when all
> RSes in the cluster have done the change, it is a 'eventually done'.
> And for synchronous replication, when changing the state of a replication
> peer, we need to know the exact time as we can only enable read/write after
> that time. So I think we'd better use procedure to do this. Change the flag
> on zk, and then execute a procedure on all RSes to reload the flag from zk.
> Another benefit is that, after the change, zk will be mainly used as a
> storage, so it will be easy to implement another replication peer storage to
> replace zk so that we can reduce the dependency on zk.
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