hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11073) Hide ZooKeeperWatcher and dependent ZK Listeners inside of a consensus impl
Date Fri, 25 Apr 2014 00:53:14 GMT
Mikhail Antonov created HBASE-11073:
---------------------------------------

             Summary: Hide ZooKeeperWatcher and dependent ZK Listeners inside of a consensus
impl
                 Key: HBASE-11073
                 URL: https://issues.apache.org/jira/browse/HBASE-11073
             Project: HBase
          Issue Type: Sub-task
          Components: Consensus, Zookeeper
    Affects Versions: 0.99.0
            Reporter: Mikhail Antonov


(copied from the design doc):

Redesign ZooKeeperListeners to abstract them from ZooKeeper API. 

            Current design:
The ZooKeeperListener interface is implemented by a number of classes and has 4 low-level
API methods
nodeCreated(), nodeDeleted(), nodeDataChanged(), nodeChildrenChanged()
ZooKeeperWatcher maintains list of listeners and upon receiving ZK event calls all registered
listeners and passes them affected znode’s path.
            
            Proposed design:
Create new interface ConsensusHandler that contains a single method, handle(Agreement agreement).
Modify the classes currently implementing the ZooKeeperListener interface so they implement
the new ConsensusHandler interface. In their handle(...) method they will typecast the agreement
instance to specific type (like AssignmentAgreement), extract the information encoded in it,
and do their work
Create an interface called AgreementLearner which will maintain a list of all ConsensusHandlers
as a map of znode prefixes to handler instance. The ZK implementation, ZkAgreementLearner,
will be used to dispatch events to the appropriate namespaces in the ZooKeeperWatcher by parsing
the znodes-level event, constructing Agreement objects of proper type and dispatching them
to appropriate ConsensusHandlers.
Modify ZooKeeperWatcher:
remove the internal collection of ZooKeeperListeners
move znode prefixes to ZkAgreementLearner class
in the handle(...) method pass the event to ZkAgreementLearner for further dispatching and
execution.

The following is a list of listeners to take care of (some are described in the items above
already):

ZKLeaderManager
ZooKeeperNodeTracker
TableHFileArchiveTracker
ActiveMasterManager
AssignmentManager
SplitLogManager
ZKProcedureUtil
SplitLogWorker
ZKPermissionWatcher
ZKSecretWatcher
ZKNamespaceManager
DeletionListener
DrainingServerTracker
RecoveringRegionWatcher
RegionServerTracker
ReplicationPeer
MasterAddressTracker
MetaRegionTracker
ClusterStatusTracker
LoadBalancerTracker




--
This message was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message