rocketmq源碼解析之broker啓動
broker啓動apache
進入這個方法org.apache.rocketmq.broker.BrokerStartup#startapp
這一行socket
// broker控制器啓動 controller.start();
進入這個方法org.apache.rocketmq.broker.BrokerController#startide
public void start() throws Exception {
if (this.messageStore != null) {
// 消磁存儲服務啓動
this.messageStore.start();
}
if (this.remotingServer != null) {
this.remotingServer.start();
}
if (this.fastRemotingServer != null) {
this.fastRemotingServer.start();
}
if (this.fileWatchService != null) {
this.fileWatchService.start();
}
if (this.brokerOuterAPI != null) {
this.brokerOuterAPI.start();
}
if (this.pullRequestHoldService != null) {
this.pullRequestHoldService.start();
}
if (this.clientHousekeepingService != null) {
this.clientHousekeepingService.start();
}
if (this.filterServerManager != null) {
this.filterServerManager.start();
}
// 註冊broker
this.registerBrokerAll(true, false, true);
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
BrokerController.this.registerBrokerAll(true, false, brokerConfig.isForceRegister());
} catch (Throwable e) {
log.error("registerBrokerAll Exception", e);
}
}
}, 1000 * 10, Math.max(10000, Math.min(brokerConfig.getRegisterNameServerPeriod(), 60000)), TimeUnit.MILLISECONDS);
if (this.brokerStatsManager != null) {
this.brokerStatsManager.start();
}
if (this.brokerFastFailure != null) {
this.brokerFastFailure.start();
}
if (BrokerRole.SLAVE != messageStoreConfig.getBrokerRole()) {
if (this.transactionalMessageCheckService != null) {
log.info("Start transaction service!");
this.transactionalMessageCheckService.start();
}
}
}
進入這個方法org.apache.rocketmq.store.DefaultMessageStore.FlushConsumeQueueService#run函數
public void run() {
DefaultMessageStore.log.info(this.getServiceName() + " service started");
while (!this.isStopped()) {
try {
int interval = DefaultMessageStore.this.getMessageStoreConfig().getFlushIntervalConsumeQueue();
this.waitForRunning(interval);
this.doFlush(1);
} catch (Exception e) {
DefaultMessageStore.log.warn(this.getServiceName() + " service has exception. ", e);
}
}
this.doFlush(RETRY_TIMES_OVER);
DefaultMessageStore.log.info(this.getServiceName() + " service end");
}
進入這個方法org.apache.rocketmq.store.ConsumeQueue#flushoop
public boolean flush(final int flushLeastPages) {
// 隊列映射文件刷新
boolean result = this.mappedFileQueue.flush(flushLeastPages);
if (isExtReadEnable()) {
result = result & this.consumeQueueExt.flush(flushLeastPages);
}
return result;
}
這一行this
// 隊列映射文件刷新 boolean result = this.mappedFileQueue.flush(flushLeastPages);
進入這個方法spa
public boolean flush(final int flushLeastPages) {
boolean result = true;
// 根據offset找到映射文件
MappedFile mappedFile = this.findMappedFileByOffset(this.flushedWhere, this.flushedWhere == 0);
if (mappedFile != null) {
long tmpTimeStamp = mappedFile.getStoreTimestamp();
int offset = mappedFile.flush(flushLeastPages);
long where = mappedFile.getFileFromOffset() + offset;
result = where == this.flushedWhere;
this.flushedWhere = where;
if (0 == flushLeastPages) {
this.storeTimestamp = tmpTimeStamp;
}
}
return result;
}
進入這個方法org.apache.rocketmq.store.MappedFileQueue#flush.net
public boolean flush(final int flushLeastPages) {
boolean result = true;
// 根據offset找到映射文件
MappedFile mappedFile = this.findMappedFileByOffset(this.flushedWhere, this.flushedWhere == 0);
if (mappedFile != null) {
long tmpTimeStamp = mappedFile.getStoreTimestamp();
int offset = mappedFile.flush(flushLeastPages);
long where = mappedFile.getFileFromOffset() + offset;
result = where == this.flushedWhere;
this.flushedWhere = where;
if (0 == flushLeastPages) {
this.storeTimestamp = tmpTimeStamp;
}
}
return result;
}
返回到這個方法這一行線程
org.apache.rocketmq.store.DefaultMessageStore#start
// 提交日誌 this.commitLog.start();
進入這個方法org.apache.rocketmq.store.CommitLog.CommitRealTimeService#run
@Override
public void run() {
CommitLog.log.info(this.getServiceName() + " service started");
while (!this.isStopped()) {
// 從配置文件中獲取配置文件
int interval = CommitLog.this.defaultMessageStore.getMessageStoreConfig().getCommitIntervalCommitLog();
int commitDataLeastPages = CommitLog.this.defaultMessageStore.getMessageStoreConfig().getCommitCommitLogLeastPages();
int commitDataThoroughInterval =
CommitLog.this.defaultMessageStore.getMessageStoreConfig().getCommitCommitLogThoroughInterval();
long begin = System.currentTimeMillis();
if (begin >= (this.lastCommitTimestamp + commitDataThoroughInterval)) {
this.lastCommitTimestamp = begin;
commitDataLeastPages = 0;
}
try {
boolean result = CommitLog.this.mappedFileQueue.commit(commitDataLeastPages);
long end = System.currentTimeMillis();
if (!result) {
this.lastCommitTimestamp = end; // result = false means some data committed.
//now wake up flush thread.
flushCommitLogService.wakeup();
}
if (end - begin > 500) {
log.info("Commit data to file costs {} ms", end - begin);
}
this.waitForRunning(interval);
} catch (Throwable e) {
CommitLog.log.error(this.getServiceName() + " service has exception. ", e);
}
}
boolean result = false;
for (int i = 0; i < RETRY_TIMES_OVER && !result; i++) {
result = CommitLog.this.mappedFileQueue.commit(0);
CommitLog.log.info(this.getServiceName() + " service shutdown, retry " + (i + 1) + " times " + (result ? "OK" : "Not OK"));
}
CommitLog.log.info(this.getServiceName() + " service end");
}
}
返回到這個方法這一行
org.apache.rocketmq.store.DefaultMessageStore#start
// 存儲狀態服務啓動 this.storeStatsService.start();
進入這個方法org.apache.rocketmq.store.StoreStatsService#run
返回到這個方法org.apache.rocketmq.store.DefaultMessageStore#start
這一行
// 存儲消息服務啓動 this.reputMessageService.start();
進入這個方法org.apache.rocketmq.store.DefaultMessageStore.ReputMessageService#run
@Override
public void run() {
DefaultMessageStore.log.info(this.getServiceName() + " service started");
while (!this.isStopped()) {
try {
Thread.sleep(1);
this.doReput();
} catch (Exception e) {
DefaultMessageStore.log.warn(this.getServiceName() + " service has exception. ", e);
}
}
DefaultMessageStore.log.info(this.getServiceName() + " service end");
}
進入這個方法org.apache.rocketmq.store.DefaultMessageStore.ReputMessageService#doReput
private void doReput() {
for (boolean doNext = true; this.isCommitLogAvailable() && doNext; ) {
if (DefaultMessageStore.this.getMessageStoreConfig().isDuplicationEnable()
&& this.reputFromOffset >= DefaultMessageStore.this.getConfirmOffset()) {
break;
}
SelectMappedBufferResult result = DefaultMessageStore.this.commitLog.getData(reputFromOffset);
if (result != null) {
try {
this.reputFromOffset = result.getStartOffset();
for (int readSize = 0; readSize < result.getSize() && doNext; ) {
DispatchRequest dispatchRequest =
DefaultMessageStore.this.commitLog.checkMessageAndReturnSize(result.getByteBuffer(), false, false);
int size = dispatchRequest.getMsgSize();
if (dispatchRequest.isSuccess()) {
if (size > 0) {
// 存儲服務轉發請求
DefaultMessageStore.this.doDispatch(dispatchRequest);
if (BrokerRole.SLAVE != DefaultMessageStore.this.getMessageStoreConfig().getBrokerRole()
&& DefaultMessageStore.this.brokerConfig.isLongPollingEnable()) {
DefaultMessageStore.this.messageArrivingListener.arriving(dispatchRequest.getTopic(),
dispatchRequest.getQueueId(), dispatchRequest.getConsumeQueueOffset() + 1,
dispatchRequest.getTagsCode(), dispatchRequest.getStoreTimestamp(),
dispatchRequest.getBitMap(), dispatchRequest.getPropertiesMap());
}
this.reputFromOffset += size;
readSize += size;
if (DefaultMessageStore.this.getMessageStoreConfig().getBrokerRole() == BrokerRole.SLAVE) {
DefaultMessageStore.this.storeStatsService
.getSinglePutMessageTopicTimesTotal(dispatchRequest.getTopic()).incrementAndGet();
DefaultMessageStore.this.storeStatsService
.getSinglePutMessageTopicSizeTotal(dispatchRequest.getTopic())
.addAndGet(dispatchRequest.getMsgSize());
}
} else if (size == 0) {
this.reputFromOffset = DefaultMessageStore.this.commitLog.rollNextFile(this.reputFromOffset);
readSize = result.getSize();
}
} else if (!dispatchRequest.isSuccess()) {
if (size > 0) {
log.error("[BUG]read total count not equals msg total size. reputFromOffset={}", reputFromOffset);
this.reputFromOffset += size;
} else {
doNext = false;
if (DefaultMessageStore.this.brokerConfig.getBrokerId() == MixAll.MASTER_ID) {
log.error("[BUG]the master dispatch message to consume queue error, COMMITLOG OFFSET: {}",
this.reputFromOffset);
this.reputFromOffset += result.getSize() - readSize;
}
}
}
}
} finally {
result.release();
}
} else {
doNext = false;
}
}
}
返回到這個方法org.apache.rocketmq.store.DefaultMessageStore#start這一行
// ha服務啓動 this.haService.start();
public void start() throws Exception {
lock = lockFile.getChannel().tryLock(0, 1, false);
if (lock == null || lock.isShared() || !lock.isValid()) {
throw new RuntimeException("Lock failed,MQ already started");
}
lockFile.getChannel().write(ByteBuffer.wrap("lock".getBytes()));
lockFile.getChannel().force(true);
// 刷新消費隊列啓動
this.flushConsumeQueueService.start();
// 提交日誌
this.commitLog.start();
// 存儲狀態服務啓動
this.storeStatsService.start();
if (this.scheduleMessageService != null && SLAVE != messageStoreConfig.getBrokerRole()) {
this.scheduleMessageService.start();
}
if (this.getMessageStoreConfig().isDuplicationEnable()) {
this.reputMessageService.setReputFromOffset(this.commitLog.getConfirmOffset());
} else {
this.reputMessageService.setReputFromOffset(this.commitLog.getMaxOffset());
}
// 存儲消息服務啓動
this.reputMessageService.start();
// ha服務啓動
this.haService.start();
this.createTempFile();
this.addScheduleTask();
this.shutdown = false;
}
進入這個方法org.apache.rocketmq.store.ha.HAService#start
進入這個方法org.apache.rocketmq.store.ha.HAService.AcceptSocketService#run
@Override
public void run() {
log.info(this.getServiceName() + " service started");
while (!this.isStopped()) {
try {
this.selector.select(1000);
Set<SelectionKey> selected = this.selector.selectedKeys();
if (selected != null) {
for (SelectionKey k : selected) {
if ((k.readyOps() & SelectionKey.OP_ACCEPT) != 0) {
SocketChannel sc = ((ServerSocketChannel) k.channel()).accept();
if (sc != null) {
HAService.log.info("HAService receive new connection, "
+ sc.socket().getRemoteSocketAddress());
try {
HAConnection conn = new HAConnection(HAService.this, sc);
// ha connection啓動
conn.start();
HAService.this.addConnection(conn);
} catch (Exception e) {
log.error("new HAConnection exception", e);
sc.close();
}
}
} else {
log.warn("Unexpected ops in select " + k.readyOps());
}
}
selected.clear();
}
} catch (Exception e) {
log.error(this.getServiceName() + " service has exception.", e);
}
}
log.info(this.getServiceName() + " service end");
}
ha connection啓動 conn.start();
public void start() {
this.readSocketService.start();
this.writeSocketService.start();
}
進入這個方法org.apache.rocketmq.store.ha.HAConnection.ReadSocketService#run
@Override
public void run() {
HAConnection.log.info(this.getServiceName() + " service started");
while (!this.isStopped()) {
try {
this.selector.select(1000);
// 處理讀事件
boolean ok = this.processReadEvent();
if (!ok) {
HAConnection.log.error("processReadEvent error");
break;
}
long interval = HAConnection.this.haService.getDefaultMessageStore().getSystemClock().now() - this.lastReadTimestamp;
if (interval > HAConnection.this.haService.getDefaultMessageStore().getMessageStoreConfig().getHaHousekeepingInterval()) {
log.warn("ha housekeeping, found this connection[" + HAConnection.this.clientAddr + "] expired, " + interval);
break;
}
} catch (Exception e) {
HAConnection.log.error(this.getServiceName() + " service has exception.", e);
break;
}
}
this.makeStop();
writeSocketService.makeStop();
haService.removeConnection(HAConnection.this);
HAConnection.this.haService.getConnectionCount().decrementAndGet();
SelectionKey sk = this.socketChannel.keyFor(this.selector);
if (sk != null) {
sk.cancel();
}
try {
this.selector.close();
this.socketChannel.close();
} catch (IOException e) {
HAConnection.log.error("", e);
}
HAConnection.log.info(this.getServiceName() + " service end");
}
這一行
處理讀事件 boolean ok = this.processReadEvent();
進入這個方法
org.apache.rocketmq.store.ha.HAConnection.WriteSocketService#run
返回到這個方法org.apache.rocketmq.store.ha.HAService#start這一行
this.groupTransferService.start();
這一行
this.haClient.start();
進入這個方法org.apache.rocketmq.store.ha.HAService.HAClient#run
@Override
public void run() {
log.info(this.getServiceName() + " service started");
while (!this.isStopped()) {
try {
// 鏈接master
if (this.connectMaster()) {
if (this.isTimeToReportOffset()) {
boolean result = this.reportSlaveMaxOffset(this.currentReportedOffset);
if (!result) {
// 關閉master
this.closeMaster();
}
}
this.selector.select(1000);
// 處理讀事件
boolean ok = this.processReadEvent();
if (!ok) {
this.closeMaster();
}
if (!reportSlaveMaxOffsetPlus()) {
continue;
}
long interval =
HAService.this.getDefaultMessageStore().getSystemClock().now()
- this.lastWriteTimestamp;
if (interval > HAService.this.getDefaultMessageStore().getMessageStoreConfig()
.getHaHousekeepingInterval()) {
log.warn("HAClient, housekeeping, found this connection[" + this.masterAddress
+ "] expired, " + interval);
this.closeMaster();
log.warn("HAClient, master not response some time, so close connection");
}
} else {
this.waitForRunning(1000 * 5);
}
} catch (Exception e) {
log.warn(this.getServiceName() + " service has exception. ", e);
this.waitForRunning(1000 * 5);
}
}
log.info(this.getServiceName() + " service end");
}
返回到這個方法org.apache.rocketmq.broker.BrokerController#start
這一行
if (this.remotingServer != null) {
this.remotingServer.start();
}
進入這個方法org.apache.rocketmq.remoting.netty.NettyRemotingServer#start
@Override
public void start() {
this.defaultEventExecutorGroup = new DefaultEventExecutorGroup(
nettyServerConfig.getServerWorkerThreads(),
// 自定義線程池中的線程名字
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(useEpoll() ? EpollServerSocketChannel.class : NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 1024)
.option(ChannelOption.SO_REUSEADDR, true)
.option(ChannelOption.SO_KEEPALIVE, false)
.childOption(ChannelOption.TCP_NODELAY, true)
.childOption(ChannelOption.SO_SNDBUF, nettyServerConfig.getServerSocketSndBufSize())
.childOption(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, HANDSHAKE_HANDLER_NAME,
new HandshakeHandler(TlsSystemConfig.tlsMode))
.addLast(defaultEventExecutorGroup,
new NettyEncoder(),
new NettyDecoder(),
new IdleStateHandler(0, 0, nettyServerConfig.getServerChannelMaxIdleTimeSeconds()),
new NettyConnectManageHandler(),
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.nettyEventExecutor.start();
}
this.timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
try {
NettyRemotingServer.this.scanResponseTable();
} catch (Throwable e) {
log.error("scanResponseTable exception", e);
}
}
}, 1000 * 3, 1000);
}
org.apache.rocketmq.remoting.netty.NettyRemotingServer.NettyServerHandler netty server解析
class NettyServerHandler extends SimpleChannelInboundHandler<RemotingCommand> {
@Override
protected void channelRead0(ChannelHandlerContext ctx, RemotingCommand msg) throws Exception {
processMessageReceived(ctx, msg);
}
}
進入這個方法org.apache.rocketmq.remoting.netty.NettyRemotingAbstract#processMessageReceived
public void processMessageReceived(ChannelHandlerContext ctx, RemotingCommand msg) throws Exception {
final RemotingCommand cmd = msg;
if (cmd != null) {
switch (cmd.getType()) {
case REQUEST_COMMAND:
// 請求消息處理
processRequestCommand(ctx, cmd);
break;
case RESPONSE_COMMAND:
// 響應消息處理
processResponseCommand(ctx, cmd);
break;
default:
break;
}
}
}
進入這個方法org.apache.rocketmq.remoting.netty.NettyRemotingAbstract#processRequestCommand
public void processRequestCommand(final ChannelHandlerContext ctx, final RemotingCommand cmd) {
// 公平的處理請求
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 {
// 客戶自定義的鉤子實現類
RPCHook rpcHook = NettyRemotingAbstract.this.getRPCHook();
if (rpcHook != null) {
// 這裏mq提供了一些鉤子方法能夠擴展的地方，請求前處理邏輯能夠在這裏擴展
rpcHook.doBeforeRequest(RemotingHelper.parseChannelRemoteAddr(ctx.channel()), cmd);
}
final RemotingCommand response = pair.getObject1().processRequest(ctx, cmd);
if (rpcHook != null) {
// 執行rocketmq請求的後置處理鉤子方法
rpcHook.doAfterResponse(RemotingHelper.parseChannelRemoteAddr(ctx.channel()), cmd, response);
}
// 若是不是單線請求
if (!cmd.isOnewayRPC()) {
if (response != null) {
response.setOpaque(opaque);
response.markResponseType();
try {
ctx.writeAndFlush(response);
} catch (Throwable e) {
log.error("process request over, but response failed", e);
log.error(cmd.toString());
log.error(response.toString());
}
} else {
}
}
} catch (Throwable e) {
log.error("process request exception", e);
log.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) {
log.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);
log.error(RemotingHelper.parseChannelRemoteAddr(ctx.channel()) + error);
}
}
進入這個方法org.apache.rocketmq.remoting.netty.NettyRemotingAbstract#processResponseCommand
public void processResponseCommand(ChannelHandlerContext ctx, RemotingCommand cmd) {
final int opaque = cmd.getOpaque();
// 從隊列中獲取responseFuture
final ResponseFuture responseFuture = responseTable.get(opaque);
if (responseFuture != null) {
responseFuture.setResponseCommand(cmd);
responseTable.remove(opaque);
if (responseFuture.getInvokeCallback() != null) {
// 若是響應對象有回調處理就處理回調函數
executeInvokeCallback(responseFuture);
} else {
responseFuture.putResponse(cmd);
responseFuture.release();
}
} else {
log.warn("receive response, but not matched any request, " + RemotingHelper.parseChannelRemoteAddr(ctx.channel()));
log.warn(cmd.toString());
}
}
返回到這個方法org.apache.rocketmq.remoting.netty.NettyRemotingServer#start
// nett處理器啓動 this.nettyEventExecutor.start();
進入這個方法org.apache.rocketmq.remoting.netty.NettyRemotingAbstract.NettyEventExecutor#run
@Override
public void run() {
log.info(this.getServiceName() + " service started");
final ChannelEventListener listener = NettyRemotingAbstract.this.getChannelEventListener();
while (!this.isStopped()) {
try {
// 事件保存在阻塞隊列中
NettyEvent event = this.eventQueue.poll(3000, TimeUnit.MILLISECONDS);
if (event != null && listener != null) {
switch (event.getType()) {
case IDLE:
listener.onChannelIdle(event.getRemoteAddr(), event.getChannel());
break;
case CLOSE:
listener.onChannelClose(event.getRemoteAddr(), event.getChannel());
break;
case CONNECT:
listener.onChannelConnect(event.getRemoteAddr(), event.getChannel());
break;
case EXCEPTION:
listener.onChannelException(event.getRemoteAddr(), event.getChannel());
break;
default:
break;
}
}
} catch (Exception e) {
log.warn(this.getServiceName() + " service has exception. ", e);
}
}
log.info(this.getServiceName() + " service end");
}
說到最後
本次解析表明我的觀點，僅供參考。
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