Hi Experts,
        In my environment, when I submit the Flink program to yarn, I do not 
specify which GC collector to use, in the web monitor page, I found it uses 
PS_Scavenge as the young generation GC collector, PS_MarkSweep as the old 
generation GC collector, I wonder if I can use G1 as the GC collector, does 
anyone has evaluated the performance of which GC collector to use? I believe 
that use G1 can reduce the old generation GC time, especially for the large 
heap.

Best
Henry

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