记一次 Redisson 线上问题 → ERR unknown command 'WAIT' 的排查与分析

开心一刻

昨晚和一个朋友聊天

我：处对象吗，咱俩试试？

朋友：我有对象

我：我不信，有对象不公开？

朋友：不好公开，我当的小三

问题背景

程序在生产环境稳定的跑着

直到有一天，公司执行组件漏洞扫描，有漏洞的 jar 要进行升级修复

然后我就按着扫描报告将有漏洞的 jar 修复到指定的版本

自己在开发环境也做了主流业务的测试，没有任何异常，稳如老狗

提测之后，测试小姐姐也没测出问题，一切都是这么美好

结果升级到生产后，生产日志疯狂报错： org.redisson.client.RedisException: ERR unknown command 'WAIT'

完整的异常堆栈信息类似如下

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org.redisson.client.RedisException: ERR unknown command 'WAIT'. channel: [id: 0x84149c6e, L:/192.168.2.40:3592 - R:/47.98.21.100:6379] command: (WAIT), params: [1, 1000]

    at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:346)
    at org.redisson.client.handler.CommandDecoder.decodeCommandBatch(CommandDecoder.java:247)
    at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:189)
    at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:117)
    at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:102)
    at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:508)
    at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.lang.Thread.run(Thread.java:748)

View Code

突然来个这个鬼玩意，脑阔有点疼

先让运维同事回滚，然后就开始了我的问题排查之旅

问题排查与处理

项目搭建

示例代码：redisson-spring-boot-demo，执行如下 test 方法即可进行测试

项目很简单，通过 redisson-spring-boot-starter 引入 redisson

扯点题外的东西，关于 redisson-spring-boot-starter 的配置方式

配置方式有很多种，官网文档做了说明，有 4 种配置方式：README.md

方式 1：

方式 2：

方式 3：

方式 4：

如果 4 种方式都配置，最终生效的是哪一种？

楼主我此刻只想给你个大嘴巴子，怎么这么多问题？

既然你们都提出来了，那我就不能不管，谁让我太爱你们了，盘它！

从哪盘，怎么盘？

源码之下无密码，我们就从源码去盘，找到自动配置类

（关于 spring-boot 的自动配置，参考：springboot2.0.3源码篇 - 自动配置的实现，发现也不是那么复杂）

RedissonAutoConfiguration 中有如下代码

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@Bean(destroyMethod = "shutdown")
@ConditionalOnMissingBean(RedissonClient.class)
public RedissonClient redisson() throws IOException {
    Config config = null;
    Method clusterMethod = ReflectionUtils.findMethod(RedisProperties.class, "getCluster");
    Method timeoutMethod = ReflectionUtils.findMethod(RedisProperties.class, "getTimeout");
    Object timeoutValue = ReflectionUtils.invokeMethod(timeoutMethod, redisProperties);
    int timeout;
    if(null == timeoutValue){
        timeout = 10000;
    }else if (!(timeoutValue instanceof Integer)) {
        Method millisMethod = ReflectionUtils.findMethod(timeoutValue.getClass(), "toMillis");
        timeout = ((Long) ReflectionUtils.invokeMethod(millisMethod, timeoutValue)).intValue();
    } else {
        timeout = (Integer)timeoutValue;
    }

    if (redissonProperties.getConfig() != null) {
        try {
            config = Config.fromYAML(redissonProperties.getConfig());
        } catch (IOException e) {
            try {
                config = Config.fromJSON(redissonProperties.getConfig());
            } catch (IOException e1) {
                throw new IllegalArgumentException("Can't parse config", e1);
            }
        }
    } else if (redissonProperties.getFile() != null) {
        try {
            InputStream is = getConfigStream();
            config = Config.fromYAML(is);
        } catch (IOException e) {
            // trying next format
            try {
                InputStream is = getConfigStream();
                config = Config.fromJSON(is);
            } catch (IOException e1) {
                throw new IllegalArgumentException("Can't parse config", e1);
            }
        }
    } else if (redisProperties.getSentinel() != null) {
        Method nodesMethod = ReflectionUtils.findMethod(Sentinel.class, "getNodes");
        Object nodesValue = ReflectionUtils.invokeMethod(nodesMethod, redisProperties.getSentinel());

        String[] nodes;
        if (nodesValue instanceof String) {
            nodes = convert(Arrays.asList(((String)nodesValue).split(",")));
        } else {
            nodes = convert((List<String>)nodesValue);
        }

        config = new Config();
        config.useSentinelServers()
            .setMasterName(redisProperties.getSentinel().getMaster())
            .addSentinelAddress(nodes)
            .setDatabase(redisProperties.getDatabase())
            .setConnectTimeout(timeout)
            .setPassword(redisProperties.getPassword());
    } else if (clusterMethod != null && ReflectionUtils.invokeMethod(clusterMethod, redisProperties) != null) {
        Object clusterObject = ReflectionUtils.invokeMethod(clusterMethod, redisProperties);
        Method nodesMethod = ReflectionUtils.findMethod(clusterObject.getClass(), "getNodes");
        List<String> nodesObject = (List) ReflectionUtils.invokeMethod(nodesMethod, clusterObject);

        String[] nodes = convert(nodesObject);

        config = new Config();
        config.useClusterServers()
            .addNodeAddress(nodes)
            .setConnectTimeout(timeout)
            .setPassword(redisProperties.getPassword());
    } else {
        config = new Config();
        String prefix = REDIS_PROTOCOL_PREFIX;
        Method method = ReflectionUtils.findMethod(RedisProperties.class, "isSsl");
        if (method != null && (Boolean)ReflectionUtils.invokeMethod(method, redisProperties)) {
            prefix = REDISS_PROTOCOL_PREFIX;
        }

        config.useSingleServer()
            .setAddress(prefix + redisProperties.getHost() + ":" + redisProperties.getPort())
            .setConnectTimeout(timeout)
            .setDatabase(redisProperties.getDatabase())
            .setPassword(redisProperties.getPassword());
    }
    if (redissonAutoConfigurationCustomizers != null) {
        for (RedissonAutoConfigurationCustomizer customizer : redissonAutoConfigurationCustomizers) {
            customizer.customize(config);
        }
    }
    return Redisson.create(config);
}