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## What changes were proposed in this pull request? With [SPARK-13992](https://issues.apache.org/jira/browse/SPARK-13992), Spark supports persisting data into off-heap memory, but the usage of on-heap and off-heap memory 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 this can be gotten from MetricsSystem. 4. Last this usage can be obtained programmatically from SparkListener. Attach the UI changes:  Backward compatibility is also considered for event-log and REST API. Old event log can still be replayed with off-heap usage displayed as 0. For REST API, only adds the new fields, so JSON backward compatibility can still be kept. ## How was this patch tested? Unit test added and manual verification. Author: jerryshao <sshao@hortonworks.com> Closes #14617 from jerryshao/SPARK-17019. |
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