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How to Implement a Streaming Watermark in Python

Mock structured streaming watermarks in Python to track late event times and compute a watermark for windowed processing.

streaming watermark spark

Python

from datetime import datetime, timedelta
import time

class StreamingWatermark:
    """Mock watermark tracker for structured streaming."""

    def __init__(self, watermark_delay_seconds):
        self.watermark_delay = timedelta(seconds=watermark_delay_seconds)
        self.max_event_time = None

    def observe_even…

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