bvolpato opened a new pull request, #27850:
URL: https://github.com/apache/beam/pull/27850

   DataflowRunner sets up MemoryMonitor aware of the GC thrashing setting:
   
   
https://github.com/apache/beam/blob/master/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/util/MemoryMonitor.java#L237-L269
   
   But when MemoryMonitor is setup by the Fn Harness, it was always assuming 
the default of 50.0, as it doesn't have a way to reach 
`DataflowPipelineDebugOptions`.
   
   Granted that this option is generalizable, I've moved 
`gcThrashingPercentagePerPeriod` to `SdkHarnessOptions`, and will use from 
there for both runner & harness.
   


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