patronovski commented on issue #5840: Subscription mode Key_Shared not working as expected URL: https://github.com/apache/pulsar/issues/5840#issuecomment-569258102 > 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. Thank you, this solves my problem.
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