Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/14835
I'll let other people review the source code in detail, except note that
people calling the REST API may want to ask for all entries, even if the web
view asks for less.
1. the rest API is documented in docs/monitoring.md ; changes need to go in
there
1. Tests in `HistoryServerSuite`;
Test-wise, I'd add something to the end of `test("incomplete apps get
refreshed")`, making another API call on the app list through
`getContentAndCode` and set the ?limit=1 value to verify 0 comes back.
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