Too many RedisCommandTimeoutException in lettuce

Question

We are facing this specific issue using lettuce redis library. We are receiving too many RedisCommandTimeoutException. We have set a timeout of 2 secs in redis-cli and 10 ms in redis slow logs. While nothing gets logged in slowlogs our application keeps getting this timeout.

Code we are using is as follows

Duration timeout = 
Duration.ofMillis(applicationProperties.redisTimeOut);
RedisClient client = RedisClient.create(RedisURI.create(applicationProperties.redisUrl));
client.setDefaultTimeout(timeout);
RedisCommands<String, String> commands = client.connect().sync();

We have about 100 threads in our application wgich might be using this shared connection

Exception we receive is as follows

io.lettuce.core.RedisCommandTimeoutException: Command timed out
at io.lettuce.core.LettuceFutures.awaitOrCancel(LettuceFutures.java:114)
at io.lettuce.core.FutureSyncInvocationHandler.handleInvocation(FutureSyncInvocationHandler.java:62)
at io.lettuce.core.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:80)
at com.sun.proxy.$Proxy11.hmget(Unknown Source)

Answer 1

I had the same error and it was that redis fell suddenly and when doing the query it took a long time and several retries, I found this way, I think there is a better way, but it worked for me

@Bean
public LettuceConnectionFactory redisConnectionFactory() {
        RedisStandaloneConfiguration redisConf = new RedisStandaloneConfiguration();
        redisConf.setHostName(env.getProperty("spring.redis.host"));
        redisConf.setPort(Integer.parseInt(env.getProperty("spring.redis.port")));
        redisConf.setPassword(RedisPassword.of(env.getProperty("spring.redis.password")));

        LettuceConnectionFactory factory = new LettuceConnectionFactory(redisConf);
        factory.setTimeout(500L); //timeout to redis

        return factory;
    }