zhouyangang edited a comment on issue #5840: Subscription mode Key_Shared not 
working as expected
URL: https://github.com/apache/pulsar/issues/5840#issuecomment-568909235
 
 
   i have met this problem also....
   finally, i find when use Key_Shared subscription mode, the producer must set 
like this:
   `   private Producer<Integer> createProducer(String topic, boolean 
enableBatch) throws PulsarClientException {
           Producer<Integer> producer = null;
           if (enableBatch) {
               producer = pulsarClient.newProducer(Schema.INT32)
                       .topic(topic)
                       .enableBatching(true)
                       .batcherBuilder(BatcherBuilder.KEY_BASED)
                       .create();
           } else {
               producer = pulsarClient.newProducer(Schema.INT32)
                       .topic(topic)
                       .enableBatching(false)
                       .create();
           }
           return producer;
       }`
   because producer enable batching by default, so you must set 
batcherBuilder(BatcherBuilder.KEY_BASED) when use Key_Shared mode.

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