Optimize Flink runner timer and OnWindowExpiration
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flink
improvement
P2
runners
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- Java
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Description
Currently Flink batch needs to load all keys in memory to expire timers and call OnWindowExpiration. We could instead use the mechanism used by RequiresTimeSortedInput ([https://github.com/apache/beam/blob/v2.34.0/runners/flink/src/main/java/org/apache/beam/runners/flink/FlinkBatchTransformTranslators.java#L702](https://github.com/apache/beam/blob/v2.34.0/runners/flink/src/main/java/org/apache/beam/runners/flink/FlinkBatchTransformTranslators.java#L702)) to expire as we go.
Imported from Jira [BEAM-13452](https://issues.apache.org/jira/browse/BEAM-13452). Original Jira may contain additional context.
Reported by: reuvenlax.
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