kafka Heartbeat 源码
kafka Heartbeat 代码
文件路径:/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Heartbeat.java
/*
* 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.kafka.clients.consumer.internals;
import org.apache.kafka.clients.GroupRebalanceConfig;
import org.apache.kafka.common.utils.LogContext;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.common.utils.Timer;
import org.slf4j.Logger;
/**
* A helper class for managing the heartbeat to the coordinator
*/
public final class Heartbeat {
private final int maxPollIntervalMs;
private final GroupRebalanceConfig rebalanceConfig;
private final Time time;
private final Timer heartbeatTimer;
private final Timer sessionTimer;
private final Timer pollTimer;
private final Logger log;
private volatile long lastHeartbeatSend = 0L;
private volatile boolean heartbeatInFlight = false;
public Heartbeat(GroupRebalanceConfig config,
Time time) {
if (config.heartbeatIntervalMs >= config.sessionTimeoutMs)
throw new IllegalArgumentException("Heartbeat must be set lower than the session timeout");
this.rebalanceConfig = config;
this.time = time;
this.heartbeatTimer = time.timer(config.heartbeatIntervalMs);
this.sessionTimer = time.timer(config.sessionTimeoutMs);
this.maxPollIntervalMs = config.rebalanceTimeoutMs;
this.pollTimer = time.timer(maxPollIntervalMs);
final LogContext logContext = new LogContext("[Heartbeat groupID=" + config.groupId + "] ");
this.log = logContext.logger(getClass());
}
private void update(long now) {
heartbeatTimer.update(now);
sessionTimer.update(now);
pollTimer.update(now);
}
public void poll(long now) {
update(now);
pollTimer.reset(maxPollIntervalMs);
}
boolean hasInflight() {
return heartbeatInFlight;
}
void sentHeartbeat(long now) {
lastHeartbeatSend = now;
heartbeatInFlight = true;
update(now);
heartbeatTimer.reset(rebalanceConfig.heartbeatIntervalMs);
if (log.isTraceEnabled()) {
log.trace("Sending heartbeat request with {}ms remaining on timer", heartbeatTimer.remainingMs());
}
}
void failHeartbeat() {
update(time.milliseconds());
heartbeatInFlight = false;
heartbeatTimer.reset(rebalanceConfig.retryBackoffMs);
log.trace("Heartbeat failed, reset the timer to {}ms remaining", heartbeatTimer.remainingMs());
}
void receiveHeartbeat() {
update(time.milliseconds());
heartbeatInFlight = false;
sessionTimer.reset(rebalanceConfig.sessionTimeoutMs);
}
boolean shouldHeartbeat(long now) {
update(now);
return heartbeatTimer.isExpired();
}
long lastHeartbeatSend() {
return this.lastHeartbeatSend;
}
long timeToNextHeartbeat(long now) {
update(now);
return heartbeatTimer.remainingMs();
}
boolean sessionTimeoutExpired(long now) {
update(now);
return sessionTimer.isExpired();
}
void resetTimeouts() {
update(time.milliseconds());
sessionTimer.reset(rebalanceConfig.sessionTimeoutMs);
pollTimer.reset(maxPollIntervalMs);
heartbeatTimer.reset(rebalanceConfig.heartbeatIntervalMs);
}
void resetSessionTimeout() {
update(time.milliseconds());
sessionTimer.reset(rebalanceConfig.sessionTimeoutMs);
}
boolean pollTimeoutExpired(long now) {
update(now);
return pollTimer.isExpired();
}
long lastPollTime() {
return pollTimer.currentTimeMs();
}
}
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