[SPARK-31632][CORE][WEBUI] Enrich the exception message when application information is unavailable#28444

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xccui wants to merge 3 commits intoapache:masterfrom

xccui:SPARK-31632

Commits on May 6, 2020

[SPARK-31632] Add a retry logic when fetching applicationInfo
xccui
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Explicitly throws a SparkException when fail to fetch the ApplicationInfo
xccui
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Commits on May 12, 2020

Remove the retry logic and add a proper exception message instead.
xccui
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