[Solved] Why might a punctuator scheduled with STREAM_TIME not trigger even if the system clock advances? — Ans: Because STREAM_TIME depends on record timestamps, not system clock time. | Kafka

Kafka - Advanced Stream Processing

Why might a punctuator scheduled with STREAM_TIME not trigger even if the system clock advances?

ABecause the system clock must be synchronized with Kafka brokers.

BBecause STREAM_TIME depends on record timestamps, not system clock time.

CBecause punctuators only trigger on WALL_CLOCK_TIME by default.

DBecause the punctuator callback must be registered after stream start.

Step-by-Step Solution

Solution:

Step 1: Understand difference between STREAM_TIME and WALL_CLOCK_TIME
STREAM_TIME triggers depend on the event time from record timestamps, not the system clock.
Step 2: Explain why system clock changes don't affect STREAM_TIME
Even if system clock advances, STREAM_TIME punctuators wait for new records with advancing timestamps.
Final Answer:
Because STREAM_TIME depends on record timestamps, not system clock time. -> Option B
Quick Check:
STREAM_TIME = record timestamps, not system clock [OK]

Quick Trick: STREAM_TIME triggers only on advancing record timestamps [OK]

Common Mistakes:

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