sarutak opened a new pull request #28820:
URL: https://github.com/apache/spark/pull/28820
### What changes were proposed in this pull request?
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This PR enriches the exception message when application summary is not
available.
#28444 covers the case when application information is not available but the
case application summary is not available is not covered.
### Why are the changes needed?
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To complement #28444 .
### Does this PR introduce _any_ user-facing change?
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Yes.
Before this change, we can get the following error message when we access to
`/jobs` if application summary is not available.
<img width="707" alt="no-such-element-exception-error-message"
src="https://user-images.githubusercontent.com/4736016/84562182-6aadf200-ad8d-11ea-8980-d63edde6fad6.png";>
After this change, we can get the following error message. It's like #28444
does.
<img width="1349" alt="enriched-errorm-message"
src="https://user-images.githubusercontent.com/4736016/84562189-85806680-ad8d-11ea-8346-4da2ec11df2b.png";>
### How was this patch tested?
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I checked with the following procedure.
1. Set breakpoint in the line of `kvstore.write(appSummary)` in
`AppStatusListener#onStartApplicatin`. Only the thread reaching this line
should be suspended.
2. Start spark-shell and wait few seconds.
3. Access to `/jobs`
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