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  1. Flink
  2. FLINK-4616

Kafka consumer doesn't store last emmited watermarks per partition in state

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Won't Fix
    • 1.1.1
    • None
    • Connectors / Kafka
    • None

    Description

      Kafka consumers stores in state only kafka offsets and doesn't store last emmited watermarks, this may go to wrong state when checkpoint is restored:

      Let's say our watermark is (timestamp - 10) and in case we have the following messages queue results will be different after checkpoint restore and during normal processing:

      A(ts = 30)
      B(ts = 35)
      ------ checkpoint goes here
      C(ts=15) – this one should be filtered by next time window
      D(ts=60)

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            roman_maier Roman Maier
            ymakhno Yuri Makhno
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            Dates

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              Updated:
              Resolved:

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