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https://issues.apache.org/jira/browse/KAFKA-6092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-6092.
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Resolution: Fixed
Have double checked the docs for coming 2.0 which is clear on the types of
punctuate, and what people should expect in the punctuation behavior as well as
the passing in time parameter.
> Time passed in punctuate call is currentTime, not punctuate schedule time.
> ---------------------------------------------------------------------------
>
> Key: KAFKA-6092
> URL: https://issues.apache.org/jira/browse/KAFKA-6092
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.11.0.0
> Reporter: Stephane Maarek
> Priority: Major
>
> The java doc specifies that for a Transformer, calling context.schedule calls
> punctuate every 1000ms. This is not entirely accurate, as if no data is
> received for a while, punctuate won't be called.
> {code}
> * void init(ProcessorContext context) {
> * this.context = context;
> * this.state = context.getStateStore("myTransformState");
> * context.schedule(1000); // call #punctuate() each
> 1000ms
> * }
> {code}
> When you receive new data say after 20 seconds, punctuate will play catch up
> and will be called 20 times at reception of the new data.
> the signature of punctuate is
> {code}
> * KeyValue punctuate(long timestamp) {
> * // can access this.state
> * // can emit as many new KeyValue pairs as required via
> this.context#forward()
> * return null; // don't return result -- can also be
> "new KeyValue()"
> * }
> {code}
> but the timestamp being passed is currentTimestamp at the time of the call to
> punctuate, not at the time the punctuate was scheduled. It is very confusing
> and I think the timestamp should represent the one at which the punctuate
> should have been scheduled. Getting the current timestamp is not adding much
> information as it can easily obtained using System.currentTimeMillis();
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