同步发送消息的失败重试
同步模式下,最多发送 3 次,当前轮次发送失败,下次选择另外一个 broker(如果存在)发送
如果设置了 sendLatencyFaultEnable 参数,会把当前的 broker 隔离一段时间
发送失败的情形
1. 消息未发出
// 消息未发出,通过 ChannelFuture 的状态得知 channel.writeAndFlush(request).addListener(new ChannelFutureListener() { @Override public void operationComplete(ChannelFuture f) throws Exception { if (f.isSuccess()) { responseFuture.setSendRequestOK(true); return; } else { responseFuture.setSendRequestOK(false); } responseTable.remove(opaque); responseFuture.setCause(f.cause()); responseFuture.putResponse(null); log.warn("send a request command to channel <" + addr + "> failed."); } });
2. 消息发出,等待响应超时
RemotingCommand responseCommand = responseFuture.waitResponse(timeoutMillis);
3. 消息发出,响应错误
当消息发送成功,等待 broker 的响应时发生超时,客户端有理由认为是网络不好,数据没有到达 broker,因此重复发送消息,也就是这种情况会导致 broker 存在重复消息。当发生 RemotingException 或 MQClientException 时,会重复发送。
// org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl#sendDefaultImpl for (; times < timesTotal; times++) { String lastBrokerName = null == mq ? null : mq.getBrokerName(); MessageQueue mqSelected = this.selectOneMessageQueue(topicPublishInfo, lastBrokerName); if (mqSelected != null) { mq = mqSelected; brokersSent[times] = mq.getBrokerName(); try { beginTimestampPrev = System.currentTimeMillis(); if (times > 0) { //Reset topic with namespace during resend. msg.setTopic(this.defaultMQProducer.withNamespace(msg.getTopic())); } long costTime = beginTimestampPrev - beginTimestampFirst; if (timeout < costTime) { callTimeout = true; break; } sendResult = this.sendKernelImpl(msg, mq, communicationMode, sendCallback, topicPublishInfo, timeout - costTime); endTimestamp = System.currentTimeMillis(); this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, false); switch (communicationMode) { case ASYNC: return null; case ONEWAY: return null; case SYNC: if (sendResult.getSendStatus() != SendStatus.SEND_OK) { if (this.defaultMQProducer.isRetryAnotherBrokerWhenNotStoreOK()) { continue; } } return sendResult; default: break; } } catch (RemotingException e) { endTimestamp = System.currentTimeMillis(); this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, true); log.warn(String.format("sendKernelImpl exception, resend at once, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e); log.warn(msg.toString()); exception = e; continue; } catch (MQClientException e) { endTimestamp = System.currentTimeMillis(); this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, true); log.warn(String.format("sendKernelImpl exception, resend at once, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e); log.warn(msg.toString()); exception = e; continue; } catch (MQBrokerException e) { endTimestamp = System.currentTimeMillis(); this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, true); log.warn(String.format("sendKernelImpl exception, resend at once, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e); log.warn(msg.toString()); exception = e; switch (e.getResponseCode()) { case ResponseCode.TOPIC_NOT_EXIST: case ResponseCode.SERVICE_NOT_AVAILABLE: case ResponseCode.SYSTEM_ERROR: case ResponseCode.NO_PERMISSION: case ResponseCode.NO_BUYER_ID: case ResponseCode.NOT_IN_CURRENT_UNIT: continue; default: if (sendResult != null) { return sendResult; } throw e; } } catch (InterruptedException e) { endTimestamp = System.currentTimeMillis(); this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, false); log.warn(String.format("sendKernelImpl exception, throw exception, InvokeID: %s, RT: %sms, Broker: %s", invokeID, endTimestamp - beginTimestampPrev, mq), e); log.warn(msg.toString()); log.warn("sendKernelImpl exception", e); log.warn(msg.toString()); throw e; } } else { break; } }
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