liupc opened a new pull request #23610: [SPARK-26684]Add logs when allocating 
large memory for PooledByteBufAllocator
URL: https://github.com/apache/spark/pull/23610
 
 
   ## What changes were proposed in this pull request?
   
   Currently, Spark use `PooledByteBufAllocator` to allocate memory for channel 
reading. However, the allocated heap/offheap memory size is not tracked. 
Sometimes, this make it difficult to  find out the cause of OOM failures(for 
instance, direct memory oom). we have to use more advanced tools like MAT or 
pmap to locate the cause.
   
   Actually, we can add some logs for `PooledByteBufAllocator` when allocating 
large memory, which can facilitate the debugging.
   
   ## How was this patch tested?
   
   NA
   
   Please review http://spark.apache.org/contributing.html before opening a 
pull request.
   

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