rezasafi edited a comment on issue #24132: [SPARK-27189][CORE] Add 
executor-level memory usage metrics to the metrics system
URL: https://github.com/apache/spark/pull/24132#issuecomment-477341237
 
 
   The only reasons that in https://github.com/apache/spark/pull/23306, I went 
for the complex approach were:
   
   - We didn't want to reintroduce again existing metrics. So the only focus 
was on Procfs metrics
   
   - We didn't want to rely on heartbeat while Metrics system has its own 
puling period setting etc.
   
   I think #23306 is better, because of the caching. It may alleviate the 
problem of  unified sampling, because we won't compute the metrics at defined 
intervals. It won't totally resolve the issue though. I think to actually 
resolve that some more sophisticated solutions is needed.

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