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https://issues.apache.org/jira/browse/HBASE-19216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16256394#comment-16256394
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Duo Zhang commented on HBASE-19216:
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Yes, we need something like a ReplicationPeers to keep all the peers at master
side, and also prevent concurrent modification on a give peer.
But I would like to make the reportProcedureDone more general. So procedure id
will always be presented, and also a serialized protobuf message. We can encode
the peer id in the protobuf message?
Anyway, it seems that we need to find the stored procedure event if we want to
wake up a procedure. Got it. Let me try to implement a create peer procedure.
Thanks sir, help a lot.
> Use procedure to execute replication peer related operations
> ------------------------------------------------------------
>
> 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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