[Solved] What is wrong with this Kafka Streams code snippet?StreamsBuilder builder = new StreamsBuilder(); KStream stream = builder.stream("input"); stream.filter((k, v) -> v.length() > 5); stream.... | Kafka

Kafka - Advanced Stream Processing

What is wrong with this Kafka Streams code snippet?

StreamsBuilder builder = new StreamsBuilder();
KStream stream = builder.stream("input");
stream.filter((k, v) -> v.length() > 5);
stream.to("output");

AFilter result is not assigned or used before to()

Bto() method is called on wrong stream type

CFilter condition syntax is invalid

DStreamsBuilder cannot create KStream

Step-by-Step Solution

Solution:

Step 1: Analyze stream transformations
filter returns a new KStream; original stream is unchanged.
Step 2: Check usage of filtered stream
Filtered stream is not assigned or used; to() is called on original stream.
Final Answer:
Filter result is not assigned or used before to() -> Option A
Quick Check:
Always use filtered stream for further operations [OK]

Quick Trick: Assign filtered stream before calling to() [OK]

Common Mistakes:

Assuming filter modifies original stream
Thinking to() is invalid here
Believing filter syntax is wrong

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What is wrong with this Kafka Streams code snippet?

Step 1: Analyze stream transformations

Step 2: Check usage of filtered stream

Final Answer:

Quick Check:

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