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Google Cloud Certified Professional Data Engineer · Google Cloud
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Timestamps are required for streaming + windowing. Missing timestamps can crash the job.
Google Cloud Dataflow requires event timestamps when using windowing in streaming mode. By default, Pub/Sub messages do not have timestamps; they need to be assigned manually using withTimestampFn()
The job fails because triggers are not set to handle late-arriving data, causing the pipeline to mishandle or drop delayed records.