Kafka Streams using Session State Store with Processor Api
How do you use session state store with the processor api? It seems like you need to know the end of the window (which is unknown) at time of processing the record. To put into the store they key is a Windowed, which consist of a key and a Window. Window gets instantiated with a start and end time. How do you know the end time? The end time will be determined when there is a gap in activity which is only know after the record (and potentially many more) are processed. Below is how I sort of expected it to work.
@Override
public void init(ProcessorContext processorContext) {
this.context = processorContext;
store = ((SessionStore) context.getStateStore("sessionstore"));
}
@Override
public void process(String key, MyValueClass value) {
//I would expect something like
store.put(key,value,timestamp)
}
apache-kafka-streams
asked Nov 19 '18 at 20:40
ChrisChris
3593418
add a comment |
How do you use session state store with the processor api? It seems like you need to know the end of the window (which is unknown) at time of processing the record. To put into the store they key is a Windowed, which consist of a key and a Window. Window gets instantiated with a start and end time. How do you know the end time? The end time will be determined when there is a gap in activity which is only know after the record (and potentially many more) are processed. Below is how I sort of expected it to work.
@Override
public void init(ProcessorContext processorContext) {
this.context = processorContext;
store = ((SessionStore) context.getStateStore("sessionstore"));
}
@Override
public void process(String key, MyValueClass value) {
//I would expect something like
store.put(key,value,timestamp)
}
apache-kafka-streams
asked Nov 19 '18 at 20:40
ChrisChris
3593418
Why don't you use the DSL, that does all the magic for you? Or check out the code of Kafka Streams' sessionProcessor: github.com/apache/kafka/blob/trunk/streams/src/main/java/org/…
– Matthias J. Sax
Nov 20 '18 at 6:01
add a comment |
How do you use session state store with the processor api? It seems like you need to know the end of the window (which is unknown) at time of processing the record. To put into the store they key is a Windowed, which consist of a key and a Window. Window gets instantiated with a start and end time. How do you know the end time? The end time will be determined when there is a gap in activity which is only know after the record (and potentially many more) are processed. Below is how I sort of expected it to work.
@Override
public void init(ProcessorContext processorContext) {
this.context = processorContext;
store = ((SessionStore) context.getStateStore("sessionstore"));
}
@Override
public void process(String key, MyValueClass value) {
//I would expect something like
store.put(key,value,timestamp)
}
apache-kafka-streams
asked Nov 19 '18 at 20:40
ChrisChris
3593418
How do you use session state store with the processor api? It seems like you need to know the end of the window (which is unknown) at time of processing the record. To put into the store they key is a Windowed, which consist of a key and a Window. Window gets instantiated with a start and end time. How do you know the end time? The end time will be determined when there is a gap in activity which is only know after the record (and potentially many more) are processed. Below is how I sort of expected it to work.
@Override
public void init(ProcessorContext processorContext) {
this.context = processorContext;
store = ((SessionStore) context.getStateStore("sessionstore"));
}
@Override
public void process(String key, MyValueClass value) {
//I would expect something like
store.put(key,value,timestamp)
}
apache-kafka-streams
apache-kafka-streams
asked Nov 19 '18 at 20:40
ChrisChris
3593418
asked Nov 19 '18 at 20:40
ChrisChris
3593418
asked Nov 19 '18 at 20:40
ChrisChris
3593418
asked Nov 19 '18 at 20:40
ChrisChris
3593418
asked Nov 19 '18 at 20:40
ChrisChris
3593418
3593418
Why don't you use the DSL, that does all the magic for you? Or check out the code of Kafka Streams' sessionProcessor: github.com/apache/kafka/blob/trunk/streams/src/main/java/org/…
– Matthias J. Sax
Nov 20 '18 at 6:01
add a comment |
Why don't you use the DSL, that does all the magic for you? Or check out the code of Kafka Streams' sessionProcessor: github.com/apache/kafka/blob/trunk/streams/src/main/java/org/…
– Matthias J. Sax
Nov 20 '18 at 6:01
Why don't you use the DSL, that does all the magic for you? Or check out the code of Kafka Streams' session
Processor: github.com/apache/kafka/blob/trunk/streams/src/main/java/org/…– Matthias J. Sax
Nov 20 '18 at 6:01
Why don't you use the DSL, that does all the magic for you? Or check out the code of Kafka Streams' session
Processor: github.com/apache/kafka/blob/trunk/streams/src/main/java/org/…– Matthias J. Sax
Nov 20 '18 at 6:01
add a comment |
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Why don't you use the DSL, that does all the magic for you? Or check out the code of Kafka Streams' session
Processor: github.com/apache/kafka/blob/trunk/streams/src/main/java/org/…– Matthias J. Sax
Nov 20 '18 at 6:01