首先看server端：class NettyRemotingServer extends NettyRemotingAbstract implements RemotingServer
下面这个实现了com.alibaba.rocketmq.remoting.RemotingService中的start方法。启动通信服务端
@Override public void start() { this.defaultEventExecutorGroup = new DefaultEventExecutorGroup(// nettyServerConfig.getServerWorkerThreads(), // new ThreadFactory() { private AtomicInteger threadIndex = new AtomicInteger(0); @Override public Thread newThread(Runnable r) { return new Thread(r, "NettyServerCodecThread_" + this.threadIndex.incrementAndGet()); } }); ServerBootstrap childHandler = // this.serverBootstrap.group(this.eventLoopGroupBoss, this.eventLoopGroupSelector).channel(NioServerSocketChannel.class) // .option(ChannelOption.SO_BACKLOG, 1024) // .option(ChannelOption.SO_REUSEADDR, true) // .option(ChannelOption.SO_KEEPALIVE, false) // .childOption(ChannelOption.TCP_NODELAY, true) // .option(ChannelOption.SO_SNDBUF, nettyServerConfig.getServerSocketSndBufSize()) // .option(ChannelOption.SO_RCVBUF, nettyServerConfig.getServerSocketRcvBufSize()) // .localAddress(new InetSocketAddress(this.nettyServerConfig.getListenPort())) .childHandler(new ChannelInitializer<SocketChannel>() { @Override public void initChannel(SocketChannel ch) throws Exception { ch.pipeline().addLast( // defaultEventExecutorGroup, // new NettyEncoder(), // new NettyDecoder(), // new IdleStateHandler(0, 0, nettyServerConfig.getServerChannelMaxIdleTimeSeconds()), // new NettyConnetManageHandler(), // new NettyServerHandler()); } }); if (nettyServerConfig.isServerPooledByteBufAllocatorEnable()) { childHandler.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT); } try { ChannelFuture sync = this.serverBootstrap.bind().sync(); InetSocketAddress addr = (InetSocketAddress) sync.channel().localAddress(); this.port = addr.getPort(); } catch (InterruptedException e1) { throw new RuntimeException("this.serverBootstrap.bind().sync() InterruptedException", e1); } if (this.channelEventListener != null) { this.nettyEventExecuter.start(); } this.timer.scheduleAtFixedRate(new TimerTask() { @Override public void run() { try { NettyRemotingServer.this.scanResponseTable(); } catch (Exception e) { log.error("scanResponseTable exception", e); } } }, 1000 * 3, 1000); }
这里重点就是那两个hander了。第一个NettyConnetManageHandler就不必讲了，是关于连接方面的功能。
class NettyConnetManageHandler extends ChannelDuplexHandler { @Override public void channelRegistered(ChannelHandlerContext ctx) throws Exception { final String remoteAddress = RemotingHelper.parseChannelRemoteAddr(ctx.channel()); log.info("NETTY SERVER PIPELINE: channelRegistered {}", remoteAddress); super.channelRegistered(ctx); } @Override public void channelUnregistered(ChannelHandlerContext ctx) throws Exception { final String remoteAddress = RemotingHelper.parseChannelRemoteAddr(ctx.channel()); log.info("NETTY SERVER PIPELINE: channelUnregistered, the channel[{}]", remoteAddress); super.channelUnregistered(ctx); } @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { final String remoteAddress = RemotingHelper.parseChannelRemoteAddr(ctx.channel()); log.info("NETTY SERVER PIPELINE: channelActive, the channel[{}]", remoteAddress); super.channelActive(ctx); if (NettyRemotingServer.this.channelEventListener != null) { NettyRemotingServer.this.putNettyEvent(new NettyEvent(NettyEventType.CONNECT, remoteAddress.toString(), ctx.channel())); } } @Override public void channelInactive(ChannelHandlerContext ctx) throws Exception { final String remoteAddress = RemotingHelper.parseChannelRemoteAddr(ctx.channel()); log.info("NETTY SERVER PIPELINE: channelInactive, the channel[{}]", remoteAddress); super.channelInactive(ctx); if (NettyRemotingServer.this.channelEventListener != null) { NettyRemotingServer.this.putNettyEvent(new NettyEvent(NettyEventType.CLOSE, remoteAddress.toString(), ctx.channel())); } } @Override public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception { if (evt instanceof IdleStateEvent) { IdleStateEvent evnet = (IdleStateEvent) evt; if (evnet.state().equals(IdleState.ALL_IDLE)) { final String remoteAddress = RemotingHelper.parseChannelRemoteAddr(ctx.channel()); log.warn("NETTY SERVER PIPELINE: IDLE exception [{}]", remoteAddress); RemotingUtil.closeChannel(ctx.channel()); if (NettyRemotingServer.this.channelEventListener != null) { NettyRemotingServer.this .putNettyEvent(new NettyEvent(NettyEventType.IDLE, remoteAddress.toString(), ctx.channel())); } } } ctx.fireUserEventTriggered(evt); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { final String remoteAddress = RemotingHelper.parseChannelRemoteAddr(ctx.channel()); log.warn("NETTY SERVER PIPELINE: exceptionCaught {}", remoteAddress); log.warn("NETTY SERVER PIPELINE: exceptionCaught exception.", cause); if (NettyRemotingServer.this.channelEventListener != null) { NettyRemotingServer.this.putNettyEvent(new NettyEvent(NettyEventType.EXCEPTION, remoteAddress.toString(), ctx.channel())); } RemotingUtil.closeChannel(ctx.channel()); }
重点看第二个handler：这个是实现处理消息的业务：NettyServerHandler
class NettyServerHandler extends SimpleChannelInboundHandler<RemotingCommand> { @Override protected void channelRead0(ChannelHandlerContext ctx, RemotingCommand msg) throws Exception { processMessageReceived(ctx, msg); } }
processMessageReceived(ctx, msg)这个方法是RemotingService继承自NettyRemotingAbstract中的方法。
我们再来看下NettyRemotingAbstract中的这个方法：
public void processMessageReceived(ChannelHandlerContext ctx, RemotingCommand msg) throws Exception { final RemotingCommand cmd = msg; if (cmd != null) { switch (cmd.getType()) { case REQUEST_COMMAND: processRequestCommand(ctx, cmd); break; case RESPONSE_COMMAND: processResponseCommand(ctx, cmd); break; default: break; } } }
public void processRequestCommand(final ChannelHandlerContext ctx, final RemotingCommand cmd) { final Pair<NettyRequestProcessor, ExecutorService> matched = this.processorTable.get(cmd.getCode()); final Pair<NettyRequestProcessor, ExecutorService> pair = null == matched ? this.defaultRequestProcessor : matched; final int opaque = cmd.getOpaque(); if (pair != null) { Runnable run = new Runnable() { @Override public void run() { try { RPCHook rpcHook = NettyRemotingAbstract.this.getRPCHook(); if (rpcHook != null) { rpcHook.doBeforeRequest(RemotingHelper.parseChannelRemoteAddr(ctx.channel()), cmd); } final RemotingCommand response = pair.getObject1().processRequest(ctx, cmd); if (rpcHook != null) { rpcHook.doAfterResponse(RemotingHelper.parseChannelRemoteAddr(ctx.channel()), cmd, response); } if (!cmd.isOnewayRPC()) { if (response != null) { response.setOpaque(opaque); response.markResponseType(); try { ctx.writeAndFlush(response); } catch (Throwable e) { plog.error("process request over, but response failed", e); plog.error(cmd.toString()); plog.error(response.toString()); } } else { } } } catch (Throwable e) { if (!"com.aliyun.openservices.ons.api.impl.authority.exception.AuthenticationException" .equals(e.getClass().getCanonicalName())) { plog.error("process request exception", e); plog.error(cmd.toString()); } if (!cmd.isOnewayRPC()) { final RemotingCommand response = RemotingCommand.createResponseCommand(RemotingSysResponseCode.SYSTEM_ERROR, // RemotingHelper.exceptionSimpleDesc(e)); response.setOpaque(opaque); ctx.writeAndFlush(response); } } } }; if (pair.getObject1().rejectRequest()) { final RemotingCommand response = RemotingCommand.createResponseCommand(RemotingSysResponseCode.SYSTEM_BUSY, "[REJECTREQUEST]system busy, start flow control for a while"); response.setOpaque(opaque); ctx.writeAndFlush(response); return; } try { final RequestTask requestTask = new RequestTask(run, ctx.channel(), cmd); pair.getObject2().submit(requestTask); } catch (RejectedExecutionException e) { if ((System.currentTimeMillis() % 10000) == 0) { plog.warn(RemotingHelper.parseChannelRemoteAddr(ctx.channel()) // + ", too many requests and system thread pool busy, RejectedExecutionException " // + pair.getObject2().toString() // + " request code: " + cmd.getCode()); } if (!cmd.isOnewayRPC()) { final RemotingCommand response = RemotingCommand.createResponseCommand(RemotingSysResponseCode.SYSTEM_BUSY, "[OVERLOAD]system busy, start flow control for a while"); response.setOpaque(opaque); ctx.writeAndFlush(response); } } } else { String error = " request type " + cmd.getCode() + " not supported"; final RemotingCommand response = RemotingCommand.createResponseCommand(RemotingSysResponseCode.REQUEST_CODE_NOT_SUPPORTED, error); response.setOpaque(opaque); ctx.writeAndFlush(response); plog.error(RemotingHelper.parseChannelRemoteAddr(ctx.channel()) + error); } }
这里就通过final Pair<NettyRequestProcessor, ExecutorService> matched = this.processorTable.get(cmd.getCode())来选择一processor来调用他的
processRequest(ctx, cmd)方法。
我们来看一个拉去消息的processor:PullMessageProcessor implements NettyRequestProcessor
@Override public RemotingCommand processRequest(final ChannelHandlerContext ctx, RemotingCommand request) throws RemotingCommandException { return this.processRequest(ctx.channel(), request, true); } private RemotingCommand processRequest(final Channel channel, RemotingCommand request, boolean brokerAllowSuspend) throws RemotingCommandException { RemotingCommand response = RemotingCommand.createResponseCommand(PullMessageResponseHeader.class); final PullMessageResponseHeader responseHeader = (PullMessageResponseHeader) response.readCustomHeader(); final PullMessageRequestHeader requestHeader = (PullMessageRequestHeader) request.decodeCommandCustomHeader(PullMessageRequestHeader.class); // 由于有直接返回的逻辑，所以必须要设置 response.setOpaque(request.getOpaque()); if (log.isDebugEnabled()) { log.debug("receive PullMessage request command, " + request); } if (!PermName.isReadable(this.brokerController.getBrokerConfig().getBrokerPermission())) { response.setCode(ResponseCode.NO_PERMISSION); response.setRemark("the broker[" + this.brokerController.getBrokerConfig().getBrokerIP1() + "] pulling message is forbidden"); return response; } SubscriptionGroupConfig subscriptionGroupConfig = this.brokerController.getSubscriptionGroupManager().findSubscriptionGroupConfig(requestHeader.getConsumerGroup()); if (null == subscriptionGroupConfig) { response.setCode(ResponseCode.SUBSCRIPTION_GROUP_NOT_EXIST); response.setRemark("subscription group not exist, " + requestHeader.getConsumerGroup() + " " + FAQUrl.suggestTodo(FAQUrl.SUBSCRIPTION_GROUP_NOT_EXIST)); return response; } if (!subscriptionGroupConfig.isConsumeEnable()) { response.setCode(ResponseCode.NO_PERMISSION); response.setRemark("subscription group no permission, " + requestHeader.getConsumerGroup()); return response; } final boolean hasSuspendFlag = PullSysFlag.hasSuspendFlag(requestHeader.getSysFlag()); final boolean hasCommitOffsetFlag = PullSysFlag.hasCommitOffsetFlag(requestHeader.getSysFlag()); final boolean hasSubscriptionFlag = PullSysFlag.hasSubscriptionFlag(requestHeader.getSysFlag()); final long suspendTimeoutMillisLong = hasSuspendFlag ? requestHeader.getSuspendTimeoutMillis() : 0; TopicConfig topicConfig = this.brokerController.getTopicConfigManager().selectTopicConfig(requestHeader.getTopic()); if (null == topicConfig) { log.error("the topic " + requestHeader.getTopic() + " not exist, consumer: " + RemotingHelper.parseChannelRemoteAddr(channel)); response.setCode(ResponseCode.TOPIC_NOT_EXIST); response.setRemark( "topic[" + requestHeader.getTopic() + "] not exist, apply first please!" + FAQUrl.suggestTodo(FAQUrl.APPLY_TOPIC_URL)); return response; } if (!PermName.isReadable(topicConfig.getPerm())) { response.setCode(ResponseCode.NO_PERMISSION); response.setRemark("the topic[" + requestHeader.getTopic() + "] pulling message is forbidden"); return response; } if (requestHeader.getQueueId() < 0 || requestHeader.getQueueId() >= topicConfig.getReadQueueNums()) { String errorInfo = "queueId[" + requestHeader.getQueueId() + "] is illagal,Topic :" + requestHeader.getTopic() + " topicConfig.readQueueNums: " + topicConfig.getReadQueueNums() + " consumer: " + channel.remoteAddress(); log.warn(errorInfo); response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark(errorInfo); return response; } SubscriptionData subscriptionData = null; if (hasSubscriptionFlag) { try { subscriptionData = FilterAPI.buildSubscriptionData(requestHeader.getConsumerGroup(), requestHeader.getTopic(), requestHeader.getSubscription()); } catch (Exception e) { log.warn("parse the consumer's subscription[{}] failed, group: {}", requestHeader.getSubscription(), // requestHeader.getConsumerGroup()); response.setCode(ResponseCode.SUBSCRIPTION_PARSE_FAILED); response.setRemark("parse the consumer's subscription failed"); return response; } } else { ConsumerGroupInfo consumerGroupInfo = this.brokerController.getConsumerManager().getConsumerGroupInfo(requestHeader.getConsumerGroup()); if (null == consumerGroupInfo) { log.warn("the consumer's group info not exist, group: {}", requestHeader.getConsumerGroup()); response.setCode(ResponseCode.SUBSCRIPTION_NOT_EXIST); response.setRemark("the consumer's group info not exist" + FAQUrl.suggestTodo(FAQUrl.SAME_GROUP_DIFFERENT_TOPIC)); return response; } if (!subscriptionGroupConfig.isConsumeBroadcastEnable() // && consumerGroupInfo.getMessageModel() == MessageModel.BROADCASTING) { response.setCode(ResponseCode.NO_PERMISSION); response.setRemark("the consumer group[" + requestHeader.getConsumerGroup() + "] can not consume by broadcast way"); return response; } subscriptionData = consumerGroupInfo.findSubscriptionData(requestHeader.getTopic()); if (null == subscriptionData) { log.warn("the consumer's subscription not exist, group: {}", requestHeader.getConsumerGroup()); response.setCode(ResponseCode.SUBSCRIPTION_NOT_EXIST); response.setRemark("the consumer's subscription not exist" + FAQUrl.suggestTodo(FAQUrl.SAME_GROUP_DIFFERENT_TOPIC)); return response; } if (subscriptionData.getSubVersion() < requestHeader.getSubVersion()) { log.warn("the broker's subscription is not latest, group: {} {}", requestHeader.getConsumerGroup(), subscriptionData.getSubString()); response.setCode(ResponseCode.SUBSCRIPTION_NOT_LATEST); response.setRemark("the consumer's subscription not latest"); return response; } } final GetMessageResult getMessageResult = this.brokerController.getMessageStore().getMessage(requestHeader.getConsumerGroup(), requestHeader.getTopic(), requestHeader.getQueueId(), requestHeader.getQueueOffset(), requestHeader.getMaxMsgNums(), subscriptionData); if (getMessageResult != null) { response.setRemark(getMessageResult.getStatus().name()); responseHeader.setNextBeginOffset(getMessageResult.getNextBeginOffset()); responseHeader.setMinOffset(getMessageResult.getMinOffset()); responseHeader.setMaxOffset(getMessageResult.getMaxOffset()); if (getMessageResult.isSuggestPullingFromSlave()) { responseHeader.setSuggestWhichBrokerId(subscriptionGroupConfig.getWhichBrokerWhenConsumeSlowly()); } else { responseHeader.setSuggestWhichBrokerId(MixAll.MASTER_ID); } switch (this.brokerController.getMessageStoreConfig().getBrokerRole()) { case ASYNC_MASTER: case SYNC_MASTER: break; case SLAVE: if (!this.brokerController.getBrokerConfig().isSlaveReadEnable()) { response.setCode(ResponseCode.PULL_RETRY_IMMEDIATELY); responseHeader.setSuggestWhichBrokerId(MixAll.MASTER_ID); } break; } if (this.brokerController.getBrokerConfig().isSlaveReadEnable()) { // consume too slow ,redirect to another machine if (getMessageResult.isSuggestPullingFromSlave()) { responseHeader.setSuggestWhichBrokerId(subscriptionGroupConfig.getWhichBrokerWhenConsumeSlowly()); } // consume ok else { responseHeader.setSuggestWhichBrokerId(subscriptionGroupConfig.getBrokerId()); } } else { responseHeader.setSuggestWhichBrokerId(MixAll.MASTER_ID); } switch (getMessageResult.getStatus()) { case FOUND: response.setCode(ResponseCode.SUCCESS); break; case MESSAGE_WAS_REMOVING: response.setCode(ResponseCode.PULL_RETRY_IMMEDIATELY); break; case NO_MATCHED_LOGIC_QUEUE: case NO_MESSAGE_IN_QUEUE: if (0 != requestHeader.getQueueOffset()) { response.setCode(ResponseCode.PULL_OFFSET_MOVED); // XXX: warn and notify me log.info("the broker store no queue data, fix the request offset {} to {}, Topic: {} QueueId: {} Consumer Group: {}", // requestHeader.getQueueOffset(), // getMessageResult.getNextBeginOffset(), // requestHeader.getTopic(), // requestHeader.getQueueId(), // requestHeader.getConsumerGroup()// ); } else { response.setCode(ResponseCode.PULL_NOT_FOUND); } break; case NO_MATCHED_MESSAGE: response.setCode(ResponseCode.PULL_RETRY_IMMEDIATELY); break; case OFFSET_FOUND_NULL: response.setCode(ResponseCode.PULL_NOT_FOUND); break; case OFFSET_OVERFLOW_BADLY: response.setCode(ResponseCode.PULL_OFFSET_MOVED); // XXX: warn and notify me log.info("the request offset: " + requestHeader.getQueueOffset() + " over flow badly, broker max offset: " + getMessageResult.getMaxOffset() + ", consumer: " + channel.remoteAddress()); break; case OFFSET_OVERFLOW_ONE: response.setCode(ResponseCode.PULL_NOT_FOUND); break; case OFFSET_TOO_SMALL: response.setCode(ResponseCode.PULL_OFFSET_MOVED); log.info("the request offset too small. group={}, topic={}, requestOffset={}, brokerMinOffset={}, clientIp={}", requestHeader.getConsumerGroup(), requestHeader.getTopic(), requestHeader.getQueueOffset(), getMessageResult.getMinOffset(), channel.remoteAddress()); break; default: assert false; break; } if (this.hasConsumeMessageHook()) { ConsumeMessageContext context = new ConsumeMessageContext(); context.setConsumerGroup(requestHeader.getConsumerGroup()); context.setTopic(requestHeader.getTopic()); context.setQueueId(requestHeader.getQueueId()); String owner = request.getExtFields().get(BrokerStatsManager.COMMERCIAL_OWNER); switch (response.getCode()) { case ResponseCode.SUCCESS: context.setCommercialRcvStats(BrokerStatsManager.StatsType.RCV_SUCCESS); context.setCommercialRcvTimes(getMessageResult.getMsgCount4Commercial()); context.setCommercialRcvSize(getMessageResult.getBufferTotalSize()); context.setCommercialOwner(owner); break; case ResponseCode.PULL_NOT_FOUND: if (!brokerAllowSuspend) { context.setCommercialRcvStats(BrokerStatsManager.StatsType.RCV_EPOLLS); context.setCommercialRcvTimes(1); context.setCommercialOwner(owner); } break; case ResponseCode.PULL_RETRY_IMMEDIATELY: case ResponseCode.PULL_OFFSET_MOVED: context.setCommercialRcvStats(BrokerStatsManager.StatsType.RCV_EPOLLS); context.setCommercialRcvTimes(1); context.setCommercialOwner(owner); break; default: assert false; break; } this.executeConsumeMessageHookBefore(context); } switch (response.getCode()) { case ResponseCode.SUCCESS: this.brokerController.getBrokerStatsManager().incGroupGetNums(requestHeader.getConsumerGroup(), requestHeader.getTopic(), getMessageResult.getMessageCount()); this.brokerController.getBrokerStatsManager().incGroupGetSize(requestHeader.getConsumerGroup(), requestHeader.getTopic(), getMessageResult.getBufferTotalSize()); this.brokerController.getBrokerStatsManager().incBrokerGetNums(getMessageResult.getMessageCount()); if (this.brokerController.getBrokerConfig().isTransferMsgByHeap()) { final long beginTimeMills = this.brokerController.getMessageStore().now(); final byte[] r = this.readGetMessageResult(getMessageResult, requestHeader.getConsumerGroup(), requestHeader.getTopic(), requestHeader.getQueueId()); this.brokerController.getBrokerStatsManager().incGroupGetLatency(requestHeader.getConsumerGroup(), // requestHeader.getTopic(), requestHeader.getQueueId(),// (int) (this.brokerController.getMessageStore().now() - beginTimeMills)); response.setBody(r); } else { try { FileRegion fileRegion = new ManyMessageTransfer(response.encodeHeader(getMessageResult.getBufferTotalSize()), getMessageResult); channel.writeAndFlush(fileRegion).addListener(new ChannelFutureListener() { @Override public void operationComplete(ChannelFuture future) throws Exception { getMessageResult.release(); if (!future.isSuccess()) { log.error("transfer many message by pagecache failed, " + channel.remoteAddress(), future.cause()); } } }); } catch (Throwable e) { log.error("transfer many message by pagecache exception", e); getMessageResult.release(); } response = null; } break; case ResponseCode.PULL_NOT_FOUND: if (brokerAllowSuspend && hasSuspendFlag) { long pollingTimeMills = suspendTimeoutMillisLong; if (!this.brokerController.getBrokerConfig().isLongPollingEnable()) { pollingTimeMills = this.brokerController.getBrokerConfig().getShortPollingTimeMills(); } String topic = requestHeader.getTopic(); long offset = requestHeader.getQueueOffset(); int queueId = requestHeader.getQueueId(); PullRequest pullRequest = new PullRequest(request, channel, pollingTimeMills, this.brokerController.getMessageStore().now(), offset, subscriptionData); this.brokerController.getPullRequestHoldService().suspendPullRequest(topic, queueId, pullRequest); response = null; break; } case ResponseCode.PULL_RETRY_IMMEDIATELY: break; case ResponseCode.PULL_OFFSET_MOVED: if (this.brokerController.getMessageStoreConfig().getBrokerRole() != BrokerRole.SLAVE || this.brokerController.getMessageStoreConfig().isOffsetCheckInSlave()) { MessageQueue mq = new MessageQueue(); mq.setTopic(requestHeader.getTopic()); mq.setQueueId(requestHeader.getQueueId()); mq.setBrokerName(this.brokerController.getBrokerConfig().getBrokerName()); OffsetMovedEvent event = new OffsetMovedEvent(); event.setConsumerGroup(requestHeader.getConsumerGroup()); event.setMessageQueue(mq); event.setOffsetRequest(requestHeader.getQueueOffset()); event.setOffsetNew(getMessageResult.getNextBeginOffset()); this.generateOffsetMovedEvent(event); log.warn( "PULL_OFFSET_MOVED:correction offset. topic={}, groupId={}, requestOffset={}, newOffset={}, suggestBrokerId={}", requestHeader.getTopic(), requestHeader.getConsumerGroup(), event.getOffsetRequest(), event.getOffsetNew(), responseHeader.getSuggestWhichBrokerId()); } else { responseHeader.setSuggestWhichBrokerId(subscriptionGroupConfig.getBrokerId()); response.setCode(ResponseCode.PULL_RETRY_IMMEDIATELY); log.warn("PULL_OFFSET_MOVED:none correction. topic={}, groupId={}, requestOffset={}, suggestBrokerId={}", requestHeader.getTopic(), requestHeader.getConsumerGroup(), requestHeader.getQueueOffset(), responseHeader.getSuggestWhichBrokerId()); } break; default: assert false; } } else { response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark("store getMessage return null"); } boolean storeOffsetEnable = brokerAllowSuspend; storeOffsetEnable = storeOffsetEnable && hasCommitOffsetFlag; storeOffsetEnable = storeOffsetEnable && this.brokerController.getMessageStoreConfig().getBrokerRole() != BrokerRole.SLAVE; if (storeOffsetEnable) { this.brokerController.getConsumerOffsetManager().commitOffset(RemotingHelper.parseChannelRemoteAddr(channel), requestHeader.getConsumerGroup(), requestHeader.getTopic(), requestHeader.getQueueId(), requestHeader.getCommitOffset()); } return response; }