Saisai Shao created SPARK-17019:
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             Summary: Expose off-heap memory usage in various places
                 Key: SPARK-17019
                 URL: https://issues.apache.org/jira/browse/SPARK-17019
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.0.0
            Reporter: Saisai Shao
            Priority: Minor


With SPARK-13992, Spark supports persisting data into off-heap memory, but the 
usage of off-heap is not exposed currently, it is not so convenient for user to 
monitor and profile, so here propose to expose off-heap memory as well as 
on-heap memory usage in various places:

1. Spark UI's executor page will display both on-heap and off-heap memory usage.
2. REST request returns both on-heap and off-heap memory.
3. Also these two memory usage can be obtained programmatically from 
SparkListener.



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