????????
         ??????flink on 
yarn????????????flink??????1.7.2??????????????????????????on 
yarn????????taskmanager.heap.size????????container??????????????container??????????????kill??????????taskmanager.heap.size
 = xmx+maxDirectMemorySize????????????????xmx = taskmanager.heap.size - cutoff 
- network??????????maxDirectMemorySize = cutoff + 
network??network????????maxDirectMemorySize??????????????cutoff????????????????cutoff??????????????maxDirectMemorySize??????????????cutoff????????????????????maxDirectMemorySize??????????metaspace????????????????????????????????????????????????????container????????????kill??

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