[Solved] Given the following Kafka Streams code snippet, what is the output type of customerCounts? var customerCounts = orders .groupBy((key, order) -> order.customerId) .count(); | Kafka

Kafka - Streams

Given the following Kafka Streams code snippet, what is the output type of customerCounts?

var customerCounts = orders
  .groupBy((key, order) -> order.customerId)
  .count();

AKTable<String, Long>

BKStream<String, Integer>

CKStream<String, Long>

DKTable<String, String>

Step-by-Step Solution

Solution:

Step 1: Understand groupBy and count return types
Grouping returns a grouped stream, and count() returns a KTable with counts per key.
Step 2: Identify key and value types
The key is String (customerId), and count returns Long values.
Final Answer:
KTable<String, Long> -> Option A
Quick Check:
count() returns KTable with Long values [OK]

Quick Trick: count() after groupBy returns KTable with Long values [OK]

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Given the following Kafka Streams code snippet, what is the output type of customerCounts?