Kafka - Advanced Stream Processing
What will happen if you call
readKeyValue() on an empty output topic in TopologyTestDriver?What will happen if you call readKeyValue() on an empty output topic in TopologyTestDriver?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Check behavior of readKeyValue() on empty topic
When no records are available, readKeyValue() returns null instead of throwing or blocking.Step 2: Compare options
Only It returns null matches this behavior; others describe exceptions, defaults, or blocking which do not occur.Final Answer:
It returns null -> Option CQuick Check:
Empty output readKeyValue() = null [OK]
Quick Trick: readKeyValue() returns null if no records present [OK]
Common Mistakes:
- Expecting exceptions on empty reads
- Assuming blocking behavior
- Thinking it returns default empty pairs
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