"Currently not connected. Command denied." Why is an error situation occurring?

[eastglow]

I'm inquiring because there is an error left during the application operation due to the Redis connection being disconnected as shown below.

The version information for the current application is as follows.

• Spring Boot 2.3.12
• lettuce-core 5.3.7
• java 11

There are two things I'm curious about,

Q1.

The first is about an hour apart, the message "Reconnecting, last destination was" appears, and the log seems to be reconnecting to the Redis server. Why are they constantly trying to reconnect?

Q2.

The second is probably related to the first question, but did I run the Redis command at the timing of trying to reconnect and get an error?

Error Logs

2024-02-28T21:31:05.473369797Z [2m2024-02-29 06:31:05.473[0;39m [32m INFO[0;39m [35m1[0;39m [2m---[0;39m [2m[xecutorLoop-1-2][0;39m [36mi.l.core.protocol.ConnectionWatchdog    [0;39m [2m:[0;39m Reconnecting, last destination was /xxx.xxx.xxx.xxx:6380
2024-02-28T21:31:05.476219209Z [2m2024-02-29 06:31:05.475[0;39m [32m INFO[0;39m [35m1[0;39m [2m---[0;39m [2m[ioEventLoop-6-2][0;39m [36mi.l.core.protocol.ReconnectionHandler   [0;39m [2m:[0;39m Reconnected to xxx.xxx.xxx.xxx:6380
2024-02-28T22:26:07.673862592Z [2m2024-02-29 07:26:07.673[0;39m [32m INFO[0;39m [35m1[0;39m [2m---[0;39m [2m[xecutorLoop-1-1][0;39m [36mi.l.core.protocol.ConnectionWatchdog    [0;39m [2m:[0;39m Reconnecting, last destination was /xxx.xxx.xxx.xxx:6379
2024-02-28T22:26:07.677330394Z [2m2024-02-29 07:26:07.677[0;39m [32m INFO[0;39m [35m1[0;39m [2m---[0;39m [2m[ioEventLoop-6-1][0;39m [36mi.l.core.protocol.ReconnectionHandler   [0;39m [2m:[0;39m Reconnected to xxx.xxx.xxx.xxx:6379
2024-02-28T22:26:07.691181563Z [2m2024-02-29 07:26:07.690[0;39m [31mERROR[0;39m [35m1[0;39m [2m---[0;39m [2m[tainer#13-0-C-1][0;39m [36mmy.test.common.cache.redis.RedisUtils [0;39m [2m:[0;39m RedisUtils addToSet exception
2024-02-28T22:26:07.69119826Z 
2024-02-28T22:26:07.691202597Z org.springframework.data.redis.RedisSystemException: Redis exception; nested exception is io.lettuce.core.RedisException: io.lettuce.core.RedisException: Currently not connected. Commands are rejected.
2024-02-28T22:26:07.691219763Z     at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:74) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691223887Z     at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:41) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691227238Z     at org.springframework.data.redis.PassThroughExceptionTranslationStrategy.translate(PassThroughExceptionTranslationStrategy.java:44) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691230569Z     at org.springframework.data.redis.FallbackExceptionTranslationStrategy.translate(FallbackExceptionTranslationStrategy.java:42) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691233805Z     at org.springframework.data.redis.connection.lettuce.LettuceConnection.convertLettuceAccessException(LettuceConnection.java:275) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691237202Z     at org.springframework.data.redis.connection.lettuce.LettuceSetCommands.convertLettuceAccessException(LettuceSetCommands.java:520) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691240427Z     at org.springframework.data.redis.connection.lettuce.LettuceSetCommands.sAdd(LettuceSetCommands.java:70) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691243593Z     at org.springframework.data.redis.connection.DefaultedRedisConnection.sAdd(DefaultedRedisConnection.java:742) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691246808Z     at org.springframework.data.redis.core.DefaultSetOperations.lambda$add$0(DefaultSetOperations.java:50) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691251048Z     at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:228) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691254237Z     at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:188) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.69125734Z     at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:96) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691260485Z     at org.springframework.data.redis.core.DefaultSetOperations.add(DefaultSetOperations.java:50) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.69126377Z     at my.test.common.cache.redis.RedisUtils.addToSet(RedisUtils.java:132) ~[my-test.common.cache-library-1.0.2.RELEASE.jar!/:na]
2024-02-28T22:26:07.691266902Z     at my.test.api.service.TestService.processTest(TestService.java:105) ~[classes!/:na]
2024-02-28T22:26:07.691270173Z     at my.test.api.consumer.TestConsumer.consumeTest(TestConsumer.java:81) ~[classes!/:na]
2024-02-28T22:26:07.691273288Z     at jdk.internal.reflect.GeneratedMethodAccessor326.invoke(Unknown Source) ~[na:na]
2024-02-28T22:26:07.691278474Z     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
2024-02-28T22:26:07.691281706Z     at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
2024-02-28T22:26:07.691284728Z     at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:171) ~[spring-messaging-5.2.15.RELEASE.jar!/:5.2.15.RELEASE]
2024-02-28T22:26:07.691287975Z     at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:120) ~[spring-messaging-5.2.15.RELEASE.jar!/:5.2.15.RELEASE]
2024-02-28T22:26:07.691291172Z     at org.springframework.kafka.listener.adapter.HandlerAdapter.invoke(HandlerAdapter.java:48) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691294293Z     at org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:325) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691297883Z     at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:87) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691301195Z     at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:52) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691304473Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeOnMessage(KafkaMessageListenerContainer.java:2044) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691307747Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeOnMessage(KafkaMessageListenerContainer.java:2025) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.69131103Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1962) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691314309Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeWithRecords(KafkaMessageListenerContainer.java:1902) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691317571Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:1790) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691320847Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:1505) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691324101Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.pollAndInvoke(KafkaMessageListenerContainer.java:1164) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.69132738Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:1059) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.691330663Z     at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
2024-02-28T22:26:07.691336442Z     at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
2024-02-28T22:26:07.691339586Z     at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na]
2024-02-28T22:26:07.691343246Z Caused by: io.lettuce.core.RedisException: io.lettuce.core.RedisException: Currently not connected. Commands are rejected.
2024-02-28T22:26:07.691346473Z     at io.lettuce.core.LettuceFutures.awaitOrCancel(LettuceFutures.java:134) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691349592Z     at io.lettuce.core.cluster.ClusterFutureSyncInvocationHandler.handleInvocation(ClusterFutureSyncInvocationHandler.java:131) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691352845Z     at io.lettuce.core.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:79) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691355988Z     at com.sun.proxy.$Proxy263.sadd(Unknown Source) ~[na:na]
2024-02-28T22:26:07.691358952Z     at org.springframework.data.redis.connection.lettuce.LettuceSetCommands.sAdd(LettuceSetCommands.java:68) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.691362172Z     ... 29 common frames omitted
2024-02-28T22:26:07.691366395Z Caused by: io.lettuce.core.RedisException: Currently not connected. Commands are rejected.
2024-02-28T22:26:07.691369454Z     at io.lettuce.core.protocol.DefaultEndpoint.validateWrite(DefaultEndpoint.java:269) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691372679Z     at io.lettuce.core.protocol.DefaultEndpoint.write(DefaultEndpoint.java:153) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691375785Z     at io.lettuce.core.cluster.ClusterDistributionChannelWriter.writeCommand(ClusterDistributionChannelWriter.java:191) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691378959Z     at io.lettuce.core.cluster.ClusterDistributionChannelWriter.writeCommand(ClusterDistributionChannelWriter.java:177) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.69138214Z     at io.lettuce.core.cluster.ClusterDistributionChannelWriter.doWrite(ClusterDistributionChannelWriter.java:134) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691385353Z     at io.lettuce.core.cluster.ClusterDistributionChannelWriter.write(ClusterDistributionChannelWriter.java:81) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691388542Z     at io.lettuce.core.RedisChannelHandler.dispatch(RedisChannelHandler.java:195) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691392071Z     at io.lettuce.core.cluster.StatefulRedisClusterConnectionImpl.dispatch(StatefulRedisClusterConnectionImpl.java:226) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.69139532Z     at io.lettuce.core.AbstractRedisAsyncCommands.dispatch(AbstractRedisAsyncCommands.java:474) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691398467Z     at io.lettuce.core.AbstractRedisAsyncCommands.sadd(AbstractRedisAsyncCommands.java:1141) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691403785Z     at jdk.internal.reflect.GeneratedMethodAccessor332.invoke(Unknown Source) ~[na:na]
2024-02-28T22:26:07.691406994Z     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
2024-02-28T22:26:07.691410096Z     at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
2024-02-28T22:26:07.691413028Z     at io.lettuce.core.cluster.ClusterFutureSyncInvocationHandler.handleInvocation(ClusterFutureSyncInvocationHandler.java:122) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.691416301Z     ... 32 common frames omitted
2024-02-28T22:26:07.691419277Z 
2024-02-28T22:26:07.694189437Z org.springframework.data.redis.RedisSystemException: Redis exception; nested exception is io.lettuce.core.RedisException: io.lettuce.core.RedisException: Currently not connected. Commands are rejected.
2024-02-28T22:26:07.6941999Z     at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:74) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694209366Z     at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:41) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694218634Z     at org.springframework.data.redis.PassThroughExceptionTranslationStrategy.translate(PassThroughExceptionTranslationStrategy.java:44) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694227775Z     at org.springframework.data.redis.FallbackExceptionTranslationStrategy.translate(FallbackExceptionTranslationStrategy.java:42) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694236756Z     at org.springframework.data.redis.connection.lettuce.LettuceConnection.convertLettuceAccessException(LettuceConnection.java:275) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694246013Z     at org.springframework.data.redis.connection.lettuce.LettuceSetCommands.convertLettuceAccessException(LettuceSetCommands.java:520) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694255183Z     at org.springframework.data.redis.connection.lettuce.LettuceSetCommands.sAdd(LettuceSetCommands.java:70) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694264084Z     at org.springframework.data.redis.connection.DefaultedRedisConnection.sAdd(DefaultedRedisConnection.java:742) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694273025Z     at org.springframework.data.redis.core.DefaultSetOperations.lambda$add$0(DefaultSetOperations.java:50) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694283523Z     at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:228) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694301374Z     at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:188) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694310702Z     at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:96) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694319482Z     at org.springframework.data.redis.core.DefaultSetOperations.add(DefaultSetOperations.java:50) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694328233Z     at my.test.common.cache.redis.RedisUtils.addToSet(RedisUtils.java:132) ~[my-test.common.cache-library-1.0.2.RELEASE.jar!/:na]
2024-02-28T22:26:07.694336898Z     at my.test.api.service.TestService.processTest(TestService.java:105) ~[classes!/:na]
2024-02-28T22:26:07.694345881Z     at my.test.api.consumer.TestConsumer.consumeTest(TestConsumer.java:81) ~[classes!/:na]
2024-02-28T22:26:07.694354629Z     at jdk.internal.reflect.GeneratedMethodAccessor326.invoke(Unknown Source) ~[na:na]
2024-02-28T22:26:07.694362999Z     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
2024-02-28T22:26:07.694371535Z     at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
2024-02-28T22:26:07.694379914Z     at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:171) ~[spring-messaging-5.2.15.RELEASE.jar!/:5.2.15.RELEASE]
2024-02-28T22:26:07.694389107Z     at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:120) ~[spring-messaging-5.2.15.RELEASE.jar!/:5.2.15.RELEASE]
2024-02-28T22:26:07.694397993Z     at org.springframework.kafka.listener.adapter.HandlerAdapter.invoke(HandlerAdapter.java:48) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694406819Z     at org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:325) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694416632Z     at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:87) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694425937Z     at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:52) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694435261Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeOnMessage(KafkaMessageListenerContainer.java:2044) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.69444437Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeOnMessage(KafkaMessageListenerContainer.java:2025) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694453661Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1962) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694467075Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeWithRecords(KafkaMessageListenerContainer.java:1902) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694476563Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:1790) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694485724Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:1505) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694494829Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.pollAndInvoke(KafkaMessageListenerContainer.java:1164) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694503978Z     at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:1059) ~[spring-kafka-2.5.14.RELEASE.jar!/:2.5.14.RELEASE]
2024-02-28T22:26:07.694513074Z     at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[na:na]
2024-02-28T22:26:07.694521516Z     at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
2024-02-28T22:26:07.69452993Z     at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na]
2024-02-28T22:26:07.694539307Z Caused by: io.lettuce.core.RedisException: io.lettuce.core.RedisException: Currently not connected. Commands are rejected.
2024-02-28T22:26:07.694548255Z     at io.lettuce.core.LettuceFutures.awaitOrCancel(LettuceFutures.java:134) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694557196Z     at io.lettuce.core.cluster.ClusterFutureSyncInvocationHandler.handleInvocation(ClusterFutureSyncInvocationHandler.java:131) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694566296Z     at io.lettuce.core.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:79) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694575042Z     at com.sun.proxy.$Proxy263.sadd(Unknown Source) ~[na:na]
2024-02-28T22:26:07.69458326Z     at org.springframework.data.redis.connection.lettuce.LettuceSetCommands.sAdd(LettuceSetCommands.java:68) ~[spring-data-redis-2.3.9.RELEASE.jar!/:2.3.9.RELEASE]
2024-02-28T22:26:07.694592267Z     ... 29 common frames omitted
2024-02-28T22:26:07.694600336Z Caused by: io.lettuce.core.RedisException: Currently not connected. Commands are rejected.
2024-02-28T22:26:07.694608796Z     at io.lettuce.core.protocol.DefaultEndpoint.validateWrite(DefaultEndpoint.java:269) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694617526Z     at io.lettuce.core.protocol.DefaultEndpoint.write(DefaultEndpoint.java:153) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694626297Z     at io.lettuce.core.cluster.ClusterDistributionChannelWriter.writeCommand(ClusterDistributionChannelWriter.java:191) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694635248Z     at io.lettuce.core.cluster.ClusterDistributionChannelWriter.writeCommand(ClusterDistributionChannelWriter.java:177) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694648259Z     at io.lettuce.core.cluster.ClusterDistributionChannelWriter.doWrite(ClusterDistributionChannelWriter.java:134) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694657575Z     at io.lettuce.core.cluster.ClusterDistributionChannelWriter.write(ClusterDistributionChannelWriter.java:81) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694666562Z     at io.lettuce.core.RedisChannelHandler.dispatch(RedisChannelHandler.java:195) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694676214Z     at io.lettuce.core.cluster.StatefulRedisClusterConnectionImpl.dispatch(StatefulRedisClusterConnectionImpl.java:226) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694688506Z     at io.lettuce.core.AbstractRedisAsyncCommands.dispatch(AbstractRedisAsyncCommands.java:474) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694701196Z     at io.lettuce.core.AbstractRedisAsyncCommands.sadd(AbstractRedisAsyncCommands.java:1141) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694714008Z     at jdk.internal.reflect.GeneratedMethodAccessor332.invoke(Unknown Source) ~[na:na]
2024-02-28T22:26:07.694726356Z     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
2024-02-28T22:26:07.694749602Z     at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
2024-02-28T22:26:07.694758946Z     at io.lettuce.core.cluster.ClusterFutureSyncInvocationHandler.handleInvocation(ClusterFutureSyncInvocationHandler.java:122) ~[lettuce-core-5.3.7.RELEASE.jar!/:5.3.7.RELEASE]
2024-02-28T22:26:07.694768282Z     ... 32 common frames omitted

[eastglow]

Is the above phenomenon related to the spring.redis.letuce.min-idel Property below?

I don't have any pool related settings at the moment, but when I looked at the default values, it was max-idle = 8, min-idle = 0, max-active = 8. Does the default value of min-idle mean that if there is no Redis related request, all connections will be lost because there is no idle connection?

Or is there a part where I need to set up options like ClientOptions separately when I create and set up LetuceConnectionFactory?

[mp911de]

Currently not connected. Commands are rejected is reported when ClientOptions.disconnectedBehavior is set to REJECT_COMMANDS (or when auto-reconnect is disabled).

I assume that your Redis server is configured to maintain either a client limit or disconnect idle clients.

[eastglow]

That's right. It's set to REJECT_COMANDS as your comment. Should I not use this option? There's no separate timeout in redis.conf on the Redis server. In this case, I understand that the default value is 0, so I don't understand that there's no separate connection timeout, could something break the connection?

Additionally, Redis servers currently consist of three in cluster mode, and each consists of Master and Slave.

RedisConnectionFactory

ClientOptions clientOptions = ClientOptions.builder()
		.disconnectedBehavior(ClientOptions.DisconnectedBehavior.REJECT_COMMANDS)
		.build();

LettuceClientConfiguration clientConfig = LettuceClientConfiguration.builder()
		.clientOptions(clientOptions)
		.readFrom(ReadFrom.REPLICA_PREFERRED)
		.build();

RedisClusterConfiguration redisClusterConfiguration = new RedisClusterConfiguration(redisProperties.getCluster().getNodes());
redisClusterConfiguration.setPassword(redisProperties.getPassword());

return new LettuceConnectionFactory(redisClusterConfiguration, clientConfig);

Redis Conf

port 6379
bind 0.0.0.0

logfile "/data01/logs/redis/node-6379.log"

cluster-enabled yes
cluster-node-timeout 4000
cluster-config-file /home/redis/redis-6.2.6/redis-cluster/node-6379.conf
cluster-migration-barrier 1

appendonly no
daemonize yes

maxmemory 60gb
maxmemory-policy volatile-lru

requirepass password
masterauth password

[mp911de]

That's right. It's set to REJECT_COMANDS as your comment. Should I not use this option?

That's up to your requirements. You asked for the reason of rejection.
Rejecting commands can be useful to fail fast and to not buffer commands when Redis is down.

Please note that reconnects can have all sorts of causes including active network components that disconnect connections.

[eastglow]

I don't know if I understand your answer correctly, but to summarize, the REJECT_COMANDS option is not directly related to the situation where Currently not connected. Command denied. However, I understood that it was related to how it works when the connection is disconnected. (Option to queue Redis commands when disconnected or not)

um... If so, it's not possible to know why the reconnection continues to occur every hour based on the above contents and options, right? I think the above exception occurred as the Redis command was executed at that reconnection timing. But I don't know the root cause of frequent reconnection. I wonder if it's normal to have that kind of periodic reconnection in the first place.