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Subject [GitHub] [beam] mxm opened a new pull request #11200: [BEAM-9573] Correct computing of watermark hold for timer output timestamp
Date Mon, 23 Mar 2020 21:26:43 GMT
mxm opened a new pull request #11200: [BEAM-9573] Correct computing of watermark hold for timer
output timestamp
URL: https://github.com/apache/beam/pull/11200
 
 
   This PR contains two related changes which would be hard to review in separate PRs:
   
   ### BEAM-9573 Correct computing of watermark hold for timer output timestamp
   
   With the introduction of timer output timestamps, a new watermark hold had been
   added to the Flink Runner. The watermark computation works on the keyed state
   backend which computes a key-scoped watermark hold and not the desired
   operator-wide watermark hold.
   
   Computation: https://github.com/apache/beam/blob/b564239081e9351c56fb0e7d263495b95dd3f8f3/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/DoFnOperator.java#L1140
   
   Key-scoped state: https://github.com/apache/beam/blob/b564239081e9351c56fb0e7d263495b95dd3f8f3/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/DoFnOperator.java#L1130
   
   The solution is to iterate over all available state backend keys.
   
   ### BEAM-9566 Mitigate performance issue with watermark hold computation
   
   Benchmarks have shown that the watermark computation over all keys is very
   expensive. This introduces a cache which stores and updates the lowest
   timestamps for watermark holds due to timer output timestamps.
   
   In most cases only the cache should be hit, only when a large number of timers
   are added and then removed one-after-another, the cache might have to be
   reloaded with data from the state backend.
   
   
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