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redisson bug分析
2022-07-06 11:45:00 【InfoQ】
1.背景
- jedis本身是基于阻塞I/O,且其方法调用都是同步的,程序流需要等到socket处理完I/O才能执行,不支持异步,jedis客户端实例不是线程安全的,需要通过连接池来使用jedis。
- redisson使用非阻塞的I/O和基于Netty框架的事件驱动的通信层,其方法调用是异步的。redisson的API是线程安全的,可以操作单个redisson连接来完成各种操作。


2. 问题分析
2.1 网络连接

net.ipv4.tcp_keepalive_time=30
net.ipv4.tcp_keepalive_probes
net.ipv4.tcp_keepalive_intvl
net.ipv4.tcp_keepalive_intvl=15
net.ipv4.tcp_keepalive_probes=5

# Close the connection after a client is idle for N seconds (0 to disable)
timeout 0
# TCP keepalive.
#
# If non-zero, use SO_KEEPALIVE to send TCP ACKs to clients in absence
# of communication. This is useful for two reasons:
#
# 1) Detect dead peers.
# 2) Take the connection alive from the point of view of network
# equipment in the middle.
#
# On Linux, the specified value (in seconds) is the period used to send ACKs.
# Note that to close the connection the double of the time is needed.
# On other kernels the period depends on the kernel configuration.
#
# A reasonable value for this option is 60 seconds.
tcp-keepalive 60
2.2 问题复现
2022-01-24 02:55:39.685 [http-nio-8080-exec-6] ERROR [o.a.c.c.C.[.[.[.[dispatcherServlet]:175] [TID:N/A] - Servlet.service() for servlet [dispatcherServlet] in context with path [/cmccplus] threw exception
org.springframework.dao.InvalidDataAccessApiUsageException: Unexpected exception while processing command; nested exception is org.redisson.client.RedisException: Unexpected exception while processing command
at org.redisson.spring.data.connection.RedissonExceptionConverter.convert(RedissonExceptionConverter.java:52)
at org.redisson.spring.data.connection.RedissonExceptionConverter.convert(RedissonExceptionConverter.java:35)
at org.springframework.data.redis.PassThroughExceptionTranslationStrategy.translate(PassThroughExceptionTranslationStrategy.java:44)
at org.redisson.spring.data.connection.RedissonConnection.transform(RedissonConnection.java:195)
at org.redisson.spring.data.connection.RedissonConnection.syncFuture(RedissonConnection.java:190)
at org.redisson.spring.data.connection.RedissonConnection.sync(RedissonConnection.java:356)
at org.redisson.spring.data.connection.RedissonConnection.write(RedissonConnection.java:722)
at org.redisson.spring.data.connection.RedissonConnection.setEx(RedissonConnection.java:530)
at org.springframework.data.redis.connection.DefaultStringRedisConnection.setEx(DefaultStringRedisConnection.java:1138)
at org.springframework.data.redis.core.DefaultValueOperations$8.potentiallyUsePsetEx(DefaultValueOperations.java:337)
at org.springframework.data.redis.core.DefaultValueOperations$8.doInRedis(DefaultValueOperations.java:330)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:223)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:190)
at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:97)
at org.springframework.data.redis.core.DefaultValueOperations.set(DefaultValueOperations.java:325)
at com.cmcc.hy.plus.biz.auth.JwtAuthenticationTokenFilter.doFilterInternal(JwtAuthenticationTokenFilter.java:150)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
at org.apache.catalina.core.StandardHostValve.invoke$original$j3CdN2QH(StandardHostValve.java:135)
at org.apache.catalina.core.StandardHostValve.invoke$original$j3CdN2QH$accessor$lXTjUmdl(StandardHostValve.java)
at org.apache.catalina.core.StandardHostValve$auxiliary$mFQ4Aq8A.call(Unknown Source)
at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:86)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1732)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.redisson.client.RedisException: Unexpected exception while processing command
at org.redisson.command.CommandAsyncService.convertException(CommandAsyncService.java:328)
at org.redisson.command.CommandAsyncService.get(CommandAsyncService.java:128)
at org.redisson.spring.data.connection.RedissonConnection.syncFuture(RedissonConnection.java:188)
... 50 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.redisson.client.handler.CommandEncoder.encode(CommandEncoder.java:130)
at org.redisson.client.handler.CommandEncoder.encode(CommandEncoder.java:99)
at org.redisson.client.handler.CommandEncoder.encode(CommandEncoder.java:55)
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107)
at org.redisson.client.handler.CommandEncoder.write(CommandEncoder.java:75)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:730)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:816)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:723)
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:120)
at org.redisson.client.handler.CommandBatchEncoder.write(CommandBatchEncoder.java:45)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738)
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:801)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794)
at org.redisson.client.handler.CommandsQueue.write(CommandsQueue.java:84)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:730)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:816)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:723)
at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:106)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:730)
at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:38)
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:1081)
at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1128)
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:1070)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:446)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
... 1 common frames omitted
[redisson-timer-4-1] ERROR [o.r.c.handler.PingConnectionHandler:77] [TID: N/A] - Unable to send PING command over channel: [id: 0x3564ed6a, L:/2.0.4.28:61450 - R:172.21.41.10/172.21.41.10:6379]
org.redisson.client.RedisTimeoutException: Command execution timeout for command: (PING), params: [], Redis client: [addr=redis://172.21.41.10:6379]
at org.redisson.client.RedisConnection.lambda$async$1(RedisConnection.java:251)
at io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:670)
at io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:745)
at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:473)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
private void sendPing(ChannelHandlerContext ctx) {
RedisConnection connection = RedisConnection.getFrom(ctx.channel());
RFuture<String> future;
if (connection.getUsage() == 0) {
future = connection.async(StringCodec.INSTANCE, RedisCommands.PING);
} else {
future = null;
}
config.getTimer().newTimeout(timeout -> {
if (connection.isClosed() || ctx.isRemoved()) {
return;
}
if (connection.getUsage() == 0
&& future != null
&& (future.cancel(false) || !future.isSuccess())) {
ctx.channel().close();
if (future.cause() != null && !future.isCancelled()) {
log.error("Unable to send PING command over channel: " + ctx.channel(), future.cause());
}
log.debug("channel: {} closed due to PING response timeout set in {} ms", ctx.channel(), config.getPingConnectionInterval());
} else {
sendPing(ctx);
}
}, config.getPingConnectionInterval(), TimeUnit.MILLISECONDS);
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
RedisConnection connection = RedisConnection.getFrom(ctx.channel());
if (connection != null) {
connection.fireDisconnected();
if (!connection.isClosed()) {
if (connection.isFastReconnect()) {
tryReconnect(connection, 1);
} else {
reconnect(connection, 1);
}
}
}
ctx.fireChannelInactive();
}


2.3 源码分析
<T> T write(byte[] key, Codec codec, RedisCommand<?> command, Object... params) {
RFuture<T> f = executorService.writeAsync(key, codec, command, params);
indexCommand(command);
return sync(f);
}
executorService.writeAsync
sync
RedisCommand
params
writeAsync
CommandEncoder
CommandEncoder
MessageToByteEncoder
@Override
protected void encode(ChannelHandlerContext ctx, CommandData<?, ?> msg, ByteBuf out) throws Exception {
try {
out.writeByte(ARGS_PREFIX);
int len = 1 + msg.getParams().length;
if (msg.getCommand().getSubName() != null) {
len++;
}
out.writeCharSequence(Long.toString(len), CharsetUtil.US_ASCII);
out.writeBytes(CRLF);
writeArgument(out, msg.getCommand().getName().getBytes(CharsetUtil.UTF_8));
if (msg.getCommand().getSubName() != null) {
writeArgument(out, msg.getCommand().getSubName().getBytes(CharsetUtil.UTF_8));
}
for (Object param : msg.getParams()) {
ByteBuf buf = encode(param);
writeArgument(out, buf);
if (!(param instanceof ByteBuf)) {
buf.release();
}
}
if (log.isTraceEnabled()) {
String info = out.toString(CharsetUtil.UTF_8);
if (RedisCommands.AUTH.equals(msg.getCommand())) {
info = info.substring(0, info.indexOf(RedisCommands.AUTH.getName()) + RedisCommands.AUTH.getName().length()) + "(password masked)";
}
log.trace("channel: {} message: {}", ctx.channel(), info);
}
} catch (Exception e) {
msg.tryFailure(e);
throw e;
}
}
encode
msg.tryFailure
try {
stringRedisTemplate.opsForValue().set("test-null", null);
} catch (Exception e) {
log.error("write null", e);
}
try {
stringRedisTemplate.opsForValue().set("test-normal-write", "1");
} catch (Exception e) {
log.error("write normal", e);
}
org.springframework.dao.QueryTimeoutException: Redis server response timeout (3000 ms) occured after 0 retry attempts. Increase nettyThreads and/or timeout settings. Try to define pingConnectionInterval setting. Command: (SET), params: [[116, 101, 115, 116, 45, 110, 111, 114, 109, 97, ...], [49]], channel: [id: 0x5fc67cb9, L:/2.0.4.190:55103 - R:172.21.41.10/172.21.41.10:6379]; nested exception is org.redisson.client.RedisResponseTimeoutException: Redis server response timeout (3000 ms) occured after 0 retry attempts. Increase nettyThreads and/or timeout settings. Try to define pingConnectionInterval setting. Command: (SET), params: [[116, 101, 115, 116, 45, 110, 111, 114, 109, 97, ...], [49]], channel: [id: 0x5fc67cb9, L:/2.0.4.190:55103 - R:172.21.41.10/172.21.41.10:6379]
at org.redisson.spring.data.connection.RedissonExceptionConverter.convert(RedissonExceptionConverter.java:48)
at org.redisson.spring.data.connection.RedissonExceptionConverter.convert(RedissonExceptionConverter.java:35)
at org.springframework.data.redis.PassThroughExceptionTranslationStrategy.translate(PassThroughExceptionTranslationStrategy.java:44)
at org.redisson.spring.data.connection.RedissonConnection.transform(RedissonConnection.java:195)
at org.redisson.spring.data.connection.RedissonConnection.syncFuture(RedissonConnection.java:190)
at org.redisson.spring.data.connection.RedissonConnection.sync(RedissonConnection.java:356)
at org.redisson.spring.data.connection.RedissonConnection.write(RedissonConnection.java:722)
at org.redisson.spring.data.connection.RedissonConnection.set(RedissonConnection.java:490)
at org.springframework.data.redis.connection.DefaultStringRedisConnection.set(DefaultStringRedisConnection.java:1102)
at org.springframework.data.redis.core.DefaultValueOperations$7.inRedis(DefaultValueOperations.java:309)
at org.springframework.data.redis.core.AbstractOperations$ValueDeserializingRedisCallback.doInRedis(AbstractOperations.java:61)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:223)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:190)
at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:97)
at org.springframework.data.redis.core.DefaultValueOperations.set(DefaultValueOperations.java:305)
at com.cmcc.hy.plus.job.controller.TestController.redis(TestController.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:681)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.cmcc.hy.plus.common.filter.LoggingFilter.doFilterInternal(LoggingFilter.java:243)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1732)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.redisson.client.RedisResponseTimeoutException: Redis server response timeout (3000 ms) occured after 0 retry attempts. Increase nettyThreads and/or timeout settings. Try to define pingConnectionInterval setting. Command: (SET), params: [[116, 101, 115, 116, 45, 110, 111, 114, 109, 97, ...], [49]], channel: [id: 0x5fc67cb9, L:/2.0.4.190:55103 - R:172.21.41.10/172.21.41.10:6379]
at org.redisson.command.RedisExecutor.lambda$scheduleResponseTimeout$5(RedisExecutor.java:341)
at io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:670)
at io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:745)
at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:473)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
... 1 common frames omitted
org.redisson.command.RedisExecutor#scheduleResponseTimeout
TimerTask timeoutResponseTask = timeout -> {
if (isResendAllowed(attempt, attempts)) {
if (!attemptPromise.cancel(false)) {
return;
}
connectionManager.newTimeout(t -> {
attempt++;
if (log.isDebugEnabled()) {
log.debug("attempt {} for command {} and params {}",
attempt, command, LogHelper.toString(params));
}
mainPromiseListener = null;
execute();
}, retryInterval, TimeUnit.MILLISECONDS);
return;
}
attemptPromise.tryFailure(
new RedisResponseTimeoutException("Redis server response timeout (" + timeoutAmount + " ms) occured"
+ " after " + attempt + " retry attempts. Increase nettyThreads and/or timeout settings. Try to define pingConnectionInterval setting. Command: "
+ LogHelper.toString(command, params) + ", channel: " + connection.getChannel()));
};
timeout = connectionManager.newTimeout(timeoutResponseTask, timeoutTime, TimeUnit.MILLISECONDS);
scheduleResponseTimeout
org.redisson.command.RedisExecutor#checkWriteFuture
checkWriteFuture
connectionFuture.onComplete((connection, e) -> {
if (connectionFuture.isCancelled()) {
connectionManager.getShutdownLatch().release();
return;
}
if (!connectionFuture.isSuccess()) {
connectionManager.getShutdownLatch().release();
exception = convertException(connectionFuture);
return;
}
sendCommand(attemptPromise, connection);
writeFuture.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
checkWriteFuture(writeFuture, attemptPromise, connection);
}
});
});
writeFuture
checkWriteFuture
scheduleResponseTimeout

CommandEncoder
org.redisson.client.handler.RedisChannelInitializer#initChannel
@Override
protected void initChannel(Channel ch) throws Exception {
initSsl(config, ch);
if (type == Type.PLAIN) {
ch.pipeline().addLast(new RedisConnectionHandler(redisClient));
} else {
ch.pipeline().addLast(new RedisPubSubConnectionHandler(redisClient));
}
ch.pipeline().addLast(
connectionWatchdog,
CommandEncoder.INSTANCE,
CommandBatchEncoder.INSTANCE);
if (type == Type.PLAIN) {
ch.pipeline().addLast(new CommandsQueue());
} else {
ch.pipeline().addLast(new CommandsQueuePubSub());
}
if (pingConnectionHandler != null) {
ch.pipeline().addLast(pingConnectionHandler);
}
if (type == Type.PLAIN) {
ch.pipeline().addLast(new CommandDecoder(config.getAddress().getScheme()));
} else {
ch.pipeline().addLast(new CommandPubSubDecoder(config));
}
ch.pipeline().addLast(new ErrorsLoggingHandler());
config.getNettyHook().afterChannelInitialization(ch);
}
pingConnectionHandler
CommandEncoder
connectionWatchdog
ErrorsLoggingHandler -> CommandsQueue -> CommandBatchEncoder -> CommandEncoder
RedisConnectionHandler -> ConnectionWatchdog -> PingConnectionHandler -> CommandDecoder -> ErrorsLoggingHandler
CommandEncoder
CommandDecoder
CommandDecoder
protected QueueCommand getCommand(ChannelHandlerContext ctx) {
Queue<QueueCommandHolder> queue = ctx.channel().attr(CommandsQueue.COMMANDS_QUEUE).get();
QueueCommandHolder holder = queue.peek();
if (holder != null) {
return holder.getCommand();
}
return null;
}
QueueCommandHolder
CommandsQueue
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
if (msg instanceof QueueCommand) {
QueueCommand data = (QueueCommand) msg;
QueueCommandHolder holder = new QueueCommandHolder(data, promise);
Queue<QueueCommandHolder> queue = ctx.channel().attr(COMMANDS_QUEUE).get();
while (true) {
if (lock.compareAndSet(false, true)) {
try {
queue.add(holder);
ctx.writeAndFlush(data, holder.getChannelPromise());
} finally {
lock.set(false);
}
break;
}
}
} else {
super.write(ctx, msg, promise);
}
}
protected void sendNext(Channel channel) {
Queue<QueueCommandHolder> queue = channel.attr(CommandsQueue.COMMANDS_QUEUE).get();
queue.poll();
state(null);
}
CommandEncode
CommandDecoder
CommandsQueue
CommandEncoder
QueueCommand
PinConnectionHandler
ConnectionWatchDog
- 和jedis一样,在set等操作开始前进行前置的判空校验;
- 在
CommandEncoder
的encode抛出异常时,使用final语句将queue中的QueueCommandHolder
推出。
3.总结
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