Hi,

        I am making a comparison between Pulsar Functions and Kafka Streams. I 
have several questions when using Pulsar Functions.
        
        1) Before creating the Pulsar Functions, I already have a producer. It 
generates 1000 messages to topic A. Then I start the Pulsar Functions to read 
data from topic A and do some handling.
        I want the Pulsar Functions could read the 1000 messages which has been 
existed in topic A when Pulsar Functions starts. How to make the Pulsar 
Functions to read data from the beginning of a topic?

        2) Does Pulsar Functions use batching when reading data from the input 
topics and sending data to output topic? How to change the batching parameters, 
like BacthingMaxSize, BatchingMaxPublishDelay?

        I am looking forward to your response.
        
        Thank you very much
        

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