[jira] [Created] (KAFKA-14752) improve kafka examples under examples package

["Luke Chen (Jira)" <ji...@apache.org>]

Luke Chen created KAFKA-14752:
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             Summary: improve kafka examples under examples package
                 Key: KAFKA-14752
                 URL: https://issues.apache.org/jira/browse/KAFKA-14752
             Project: Kafka
          Issue Type: Improvement
            Reporter: Luke Chen


Kafka provided some examples under "examples" package. Currently we provided
 * java-producer-consumer-demo, which is to produce 10000 records and then consume all of them
 * exactly-once-demo, which is to produce records -> consume -> process  -> consume.

Among them, the base component is producer and consumer. However, I found the producer and consumer example is not in a good form. For example:
 # Both consumer and producer doesn't gracefully close the resource after completed
 # The example doesn't provide a good example to handle different kind of exceptions. It's just a happy path example
 # No clear comment to instruct users why we should do this, and what it is doing for each operation.

 

Furthermore, while running both the examples, I saw flood of logs output because we print one line for message sent, and one line for message received. In java-producer-consumer-demo, there will be 10000 records sent/received, so > 20000 lines of logs output. Same for exactly-once-demo. Maybe we should consider to reduce the record number.

 

One more thing, in exactly-once-demo.java, there are clear class java doc in the demo file, but there's nothing in java-producer-consumer-demo.java. We should also improve that.

 

 



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