[jira] [Created] (SPARK-25917) Spark UI's executors page loads forever when memoryMetrics in None. Fix is to JSON ignore memorymetrics when it is None.

Thu, 01 Nov 2018 12:55:23 -0700 

Rong Tang created SPARK-25917:
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             Summary: Spark UI's executors page loads forever when 
memoryMetrics in None. Fix is to JSON ignore memorymetrics when it is None.
                 Key: SPARK-25917
                 URL: https://issues.apache.org/jira/browse/SPARK-25917
             Project: Spark
          Issue Type: Bug
          Components: Spark Core, Web UI
    Affects Versions: 2.3.2
            Reporter: Rong Tang


Spark UI's executors page loads forever when memoryMetrics in None. Fix is to 
JSON ignore memorymetrics when it is None.

## How was this patch tested?

Before fix: (loads forever)
![image](https://user-images.githubusercontent.com/1785565/47875681-64dfe480-ddd4-11e8-8d15-5ed1457bc24f.png)

After fix:

![image](https://user-images.githubusercontent.com/1785565/47875691-6b6e5c00-ddd4-11e8-9895-db8dd9730ee1.png)



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