/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.nifi.controller.cluster;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import org.apache.nifi.cluster.coordination.ClusterCoordinator;
import org.apache.nifi.cluster.coordination.node.ClusterRoles;
import org.apache.nifi.cluster.coordination.node.NodeConnectionStatus;
import org.apache.nifi.cluster.protocol.HeartbeatPayload;
import org.apache.nifi.cluster.protocol.NodeIdentifier;
import org.apache.nifi.cluster.protocol.NodeProtocolSender;
import org.apache.nifi.cluster.protocol.ProtocolException;
import org.apache.nifi.cluster.protocol.message.HeartbeatMessage;
import org.apache.nifi.cluster.protocol.message.HeartbeatResponseMessage;
import org.apache.nifi.controller.leader.election.LeaderElectionManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Uses Leader Election Manager in order to determine which node is the elected
* Cluster Coordinator and to indicate that this node is part of the cluster.
* Once the Cluster Coordinator is known, heartbeats are sent directly to the
* Cluster Coordinator.
*/
public class ClusterProtocolHeartbeater implements Heartbeater {
private static final Logger logger = LoggerFactory.getLogger(ClusterProtocolHeartbeater.class);
private final NodeProtocolSender protocolSender;
private final LeaderElectionManager electionManager;
private final ClusterCoordinator clusterCoordinator;
public ClusterProtocolHeartbeater(final NodeProtocolSender protocolSender, final ClusterCoordinator clusterCoordinator, final LeaderElectionManager electionManager) {
this.protocolSender = protocolSender;
this.clusterCoordinator = clusterCoordinator;
this.electionManager = electionManager;
}
@Override
public String getHeartbeatAddress() {
final String heartbeatAddress = electionManager.getLeader(ClusterRoles.CLUSTER_COORDINATOR);
if (heartbeatAddress == null) {
throw new ProtocolException("Cannot send heartbeat because there is no Cluster Coordinator currently elected");
}
return heartbeatAddress;
}
@Override
public synchronized void send(final HeartbeatMessage heartbeatMessage) throws IOException {
final long sendStart = System.nanoTime();
final String heartbeatAddress = getHeartbeatAddress();
final HeartbeatResponseMessage responseMessage = protocolSender.heartbeat(heartbeatMessage, heartbeatAddress);
final byte[] payloadBytes = heartbeatMessage.getHeartbeat().getPayload();
final HeartbeatPayload payload = HeartbeatPayload.unmarshal(payloadBytes);
final List<NodeConnectionStatus> nodeStatusList = payload.getClusterStatus();
final Map<NodeIdentifier, Long> updateIdMap = nodeStatusList.stream().collect(
Collectors.toMap(status -> status.getNodeIdentifier(), status -> status.getUpdateIdentifier()));
final List<NodeConnectionStatus> updatedStatuses = responseMessage.getUpdatedNodeStatuses();
if (updatedStatuses != null) {
for (final NodeConnectionStatus updatedStatus : updatedStatuses) {
final NodeIdentifier nodeId = updatedStatus.getNodeIdentifier();
final Long updateId = updateIdMap.get(nodeId);
final boolean updated = clusterCoordinator.resetNodeStatus(updatedStatus, updateId == null ? -1L : updateId);
if (updated) {
logger.info("After receiving heartbeat response, updated status of {} to {}", updatedStatus.getNodeIdentifier(), updatedStatus);
} else {
logger.debug("After receiving heartbeat response, did not update status of {} to {} because the update is out-of-date", updatedStatus.getNodeIdentifier(), updatedStatus);
}
}
}
final long sendNanos = System.nanoTime() - sendStart;
final long sendMillis = TimeUnit.NANOSECONDS.toMillis(sendNanos);
final DateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss,SSS", Locale.US);
final String flowElectionMessage = responseMessage.getFlowElectionMessage();
final String formattedElectionMessage = flowElectionMessage == null ? "" : "; " + flowElectionMessage;
logger.info("Heartbeat created at {} and sent to {} at {}; send took {} millis{}",
dateFormatter.format(new Date(heartbeatMessage.getHeartbeat().getCreatedTimestamp())),
heartbeatAddress,
dateFormatter.format(new Date()),
sendMillis,
formattedElectionMessage);
}
@Override
public void close() throws IOException {
}
}