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From "Chris Trezzo (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7564) [replication] Create interfaces for manipulation of replication state
Date Tue, 15 Jan 2013 01:05:11 GMT
Chris Trezzo created HBASE-7564:

             Summary: [replication] Create interfaces for manipulation of replication state
                 Key: HBASE-7564
                 URL: https://issues.apache.org/jira/browse/HBASE-7564
             Project: HBase
          Issue Type: Improvement
          Components: Replication
            Reporter: Chris Trezzo
            Assignee: Chris Trezzo
             Fix For: 0.96.0

Currently ReplicationZookeeper maintains all the zookeeper state for replication. This makes
the class relatively large and slightly confusing. There are three major pieces of zookeeper
state maintained for replication:

1. The state of replication (i.e. whether replication is ENABLED or DISABLED on the cluster).
This is held in the state znode.

2. The set of slave (or peer) clusters that replication needs to ship edits to. This is held
in the peer znode.

3. The replication queues that keep track of which hlog files still need to be replicated.
There is one queue for each replication source/peer cluster pair.

Splitting each of these three pieces into their own interfaces will separate the implementation
from the operations needed to manipulate replication state. This will allow easier unit testing
of the replication logic and more flexibility for future implementations of how replication
state is stored.

The plan is to implement these changes as a series of patches (at least one for each of the
three interfaces). The state interface will be first, since it is the most separate from the
other three pieces.

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