Cannot determine a partition for slot

[mandeepjain]

Bug Report

Current Behavior

During certain redis operations, I am facing PartitionSelectorException.

Stack trace

Caused by: io.lettuce.core.cluster.PartitionSelectorException: Cannot determine a partition for slot 12004.
	at io.lettuce.core.cluster.PooledClusterConnectionProvider.getWriteConnection(PooledClusterConnectionProvider.java:164)
	at io.lettuce.core.cluster.PooledClusterConnectionProvider.getConnectionAsync(PooledClusterConnectionProvider.java:149)
	at io.lettuce.core.cluster.ClusterDistributionChannelWriter.doWrite(ClusterDistributionChannelWriter.java:170)
	at io.lettuce.core.cluster.ClusterDistributionChannelWriter.write(ClusterDistributionChannelWriter.java:103)
	at io.lettuce.core.RedisChannelHandler.dispatch(RedisChannelHandler.java:218)
	at io.lettuce.core.cluster.StatefulRedisClusterConnectionImpl.dispatch(StatefulRedisClusterConnectionImpl.java:216)
	at io.lettuce.core.AbstractRedisAsyncCommands.dispatch(AbstractRedisAsyncCommands.java:676)
	at io.lettuce.core.AbstractRedisAsyncCommands.get(AbstractRedisAsyncCommands.java:960)
	at sun.reflect.GeneratedMethodAccessor425.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at io.lettuce.core.cluster.ClusterFutureSyncInvocationHandler.handleInvocation(ClusterFutureSyncInvocationHandler.java:122)
	at io.lettuce.core.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:80)
	at com.sun.proxy.$Proxy254.get(Unknown Source)
	at org.springframework.data.redis.connection.lettuce.LettuceStringCommands.get(LettuceStringCommands.java:68)

Input Code

Code Configuration

ClusterTopologyRefreshOptions topologyRefreshOptions = ClusterTopologyRefreshOptions.builder()
            .enablePeriodicRefresh(Duration.ofSeconds(30))
            .enableAllAdaptiveRefreshTriggers()
            .build();

  ClientOptions options = ClusterClientOptions.builder()
            .disconnectedBehavior(ClientOptions.DisconnectedBehavior.REJECT_COMMANDS)
            .autoReconnect(true)
            .topologyRefreshOptions(topologyRefreshOptions)
            .build();

   GenericObjectPoolConfig genericObjectPoolConfig = new GenericObjectPoolConfig();
    genericObjectPoolConfig.setMinIdle(8);
    genericObjectPoolConfig.setMaxIdle(16);
    genericObjectPoolConfig.setMaxTotal(16);
   LettucePoolingClientConfiguration.builder()
            .poolConfig(genericObjectPoolConfig)
            .clientOptions(options)
            .clientResources(clientResources)
            .build();

Expected behavior/code

Environment

• Lettuce version(s): [6.1.5.RELEASE]
• Redis version: [5.0.6]
• Shards: 6
• Number of nodes: 12

Analysis

Redis cluster is healthy, all the metrics are as expected.

So, could give me some suggestions. Thank you!

[mp911de]

This happens if CLUSTER NODES doesn't report a master node for the intended slot.

[mandeepjain]

Found the issue fixed here:
#2178

@mp911de I guess it was a bug in older versions