[Solved] What will be the output of this Kafka Streams code?var result = stream.filter((k, v) -> v.startsWith("A")) .map((k, v) -> KeyValue.pair(k, v.length()));result.foreach((k, v) -> System.out.... | Kafka

Kafka - Streams

What will be the output of this Kafka Streams code?

var result = stream.filter((k, v) -> v.startsWith("A"))
                   .map((k, v) -> KeyValue.pair(k, v.length()));
result.foreach((k, v) -> System.out.println(k + ":" + v));

Input records:
{"1":"Apple", "2":"Banana", "3":"Avocado"}

A1:Apple 3:Avocado

B1:5 3:7

C2:6

DNo output

Step-by-Step Solution

Solution:

Step 1: Filter records starting with 'A'
Records with keys "1" (Apple) and "3" (Avocado) pass the filter.
Step 2: Map values to their length
"Apple" length is 5, "Avocado" length is 7, printed as key:value.
Final Answer:
1:5 3:7 -> Option B
Quick Check:
filter by start letter, map to length [OK]

Quick Trick: Filter by condition, map to transform value [OK]

Common Mistakes:

MISTAKES

Printing original values instead of lengths
Including filtered out records
Mixing keys and values in output

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What will be the output of this Kafka Streams code?

Step 1: Filter records starting with 'A'

Step 2: Map values to their length

Final Answer:

Quick Check:

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