@Override
public boolean isConnected() {
if (_zkclient == null) {
return false;
}
ZkConnection zkconnection = (ZkConnection) _zkclient.getConnection();
if (zkconnection != null) {
States state = zkconnection.getZookeeperState();
return state == States.CONNECTED;
}
return false;
}
/**
* wait until we get a non-zero session-id. note that we might lose zkconnection right after we
* read session-id. but it's ok to get stale session-id and we will have another
* handle-new-session callback to correct this.
*/
void waitUntilConnected() {
boolean isConnected;
do {
isConnected =
_zkclient.waitUntilConnected(ZkClient.DEFAULT_CONNECTION_TIMEOUT, TimeUnit.MILLISECONDS);
if (!isConnected) {
LOG.error(
"fail to connect zkserver: "
+ _zkAddress
+ " in "
+ ZkClient.DEFAULT_CONNECTION_TIMEOUT
+ "ms. expiredSessionId: "
+ _sessionId
+ ", clusterName: "
+ _clusterName);
continue;
}
ZkConnection zkConnection = ((ZkConnection) _zkclient.getConnection());
_sessionId = Long.toHexString(zkConnection.getZookeeper().getSessionId());
/**
* at the time we read session-id, zkconnection might be lost again wait until we get a
* non-zero session-id
*/
} while ("0".equals(_sessionId));
LOG.info(
"Handling new session, session id: "
+ _sessionId
+ ", instance: "
+ _instanceName
+ ", instanceTye: "
+ _instanceType
+ ", cluster: "
+ _clusterName
+ ", zkconnection: "
+ ((ZkConnection) _zkclient.getConnection()).getZookeeper());
}
@Override
public void handleStateChanged(KeeperState state) throws Exception {
switch (state) {
case SyncConnected:
ZkConnection zkConnection = (ZkConnection) _zkclient.getConnection();
LOG.info("KeeperState: " + state + ", zookeeper:" + zkConnection.getZookeeper());
break;
case Disconnected:
LOG.info(
"KeeperState:"
+ state
+ ", disconnectedSessionId: "
+ _sessionId
+ ", instance: "
+ _instanceName
+ ", type: "
+ _instanceType);
/**
* Track the time stamp that the disconnected happens, then check history and see if we
* should disconnect the helix-manager
*/
_disconnectTimeHistory.add(System.currentTimeMillis());
if (isFlapping()) {
LOG.error(
"instanceName: "
+ _instanceName
+ " is flapping. diconnect it. "
+ " maxDisconnectThreshold: "
+ _maxDisconnectThreshold
+ " disconnects in "
+ _flappingTimeWindowMs
+ "ms.");
disconnect();
}
break;
case Expired:
LOG.info(
"KeeperState:"
+ state
+ ", expiredSessionId: "
+ _sessionId
+ ", instance: "
+ _instanceName
+ ", type: "
+ _instanceType);
break;
default:
break;
}
}
