Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/17963
I don't think so. Because `mergeApplicationListing` and `getAppUI` are
running in two different threads, there could be a chance where this two
methods are processing the same event file. This could be happened when
`mergeApplicationListing` is processing a large event file, at this time
`getAppUI` kicked in.
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