Why the consumer can't receve the message if fetch_size=1

[魏宏達]

Hi Kafka Team

I write some simple program and find a strange issue.
Why the consumer can’t receive the message if the fetch is set to 1 , but when 
the parameter set to 100.
The consumer will receive the message normally.

FetchRequest req = new FetchRequestBuilder()
        .clientId(clientName)
        .addFetch(a_topic, a_partition, readOffset, 100)
        .build();



Thanks~

Best Regards

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