Chris Trezzo created HBASE-7564:
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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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