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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-19216) Use procedure to execute replication peer related operations
Date Wed, 08 Nov 2017 12:52:01 GMT
Duo Zhang created HBASE-19216:
---------------------------------

             Summary: 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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