NPE when doing multi-exec against cluster

[Roy Varghese]

Hi

I am trying the code example of multi-exec against a 3 master cluster, all running on localhost..

            RedisClusterClient rcc = RedisClusterClient.create(uris);

            cconn = rcc.connect();

            RedisAdvancedClusterCommands ccommands = cconn.sync();

            ccommands.multi();

            ccommands.set("one", "1");

            ccommands.set("two", "2");

            ccommands.mget("one", "two");

            ccommands.lpush("list", "11");

            ccommands.llen("list");

            ccommands.exec();

But the exec() throws an NPE error:

java.lang.NullPointerException

at com.lambdaworks.redis.cluster.ClusterDistributionChannelWriter.write(ClusterDistributionChannelWriter.java:99)

at com.lambdaworks.redis.RedisChannelHandler.dispatch(RedisChannelHandler.java:106)

at com.lambdaworks.redis.cluster.StatefulRedisClusterConnectionImpl.dispatch(StatefulRedisClusterConnectionImpl.java:189)

at com.lambdaworks.redis.AbstractRedisAsyncCommands.dispatch(AbstractRedisAsyncCommands.java:1726)

at com.lambdaworks.redis.AbstractRedisAsyncCommands.dispatch(AbstractRedisAsyncCommands.java:1721)

at com.lambdaworks.redis.AbstractRedisAsyncCommands.dispatch(AbstractRedisAsyncCommands.java:1717)

at com.lambdaworks.redis.AbstractRedisAsyncCommands.exec(AbstractRedisAsyncCommands.java:351)

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:497)

at com.lambdaworks.redis.cluster.StatefulRedisClusterConnectionImpl$ClusterFutureSyncInvocationHandler.handleInvocation(StatefulRedisClusterConnectionImpl.java:334)

at com.google.common.reflect.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:87)

at com.sun.proxy.$Proxy4.exec(Unknown Source)

What could be wrong? I can see that the keys are being created in the redis db across the 3 different cluster instances.

I am using 4.1.Final

-Roy

[Mark Paluch]

Hi Roy, 

Redis Cluster and MULTI aren't supported in a sane way yet. Could you file a ticket at https://github.com/mp911de/lettuce/issues?

Thanks, Mark

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[Roy Varghese]

Hi Mark, 

I've filed issue #187; looks like you already noticed.

Meanwhile, what's the recommended way for running transactions against clusters?

I can restrict my transaction to keys in the same shard/cluster-node. I see an example of connecting to a node here

https://github.com/mp911de/lettuce/wiki/Redis-Cluster

but how do I know which node to pick?

Thanks

Roy

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