zentol opened a new pull request #9558: [FLINK-13892][hs] Harden 
HistoryServerTest
URL: https://github.com/apache/flink/pull/9558
 
 
   The HistoryServerTest can fail if the HS attempts to unpack a partially 
written archive. The test only checked that the HS made 1 _attempt_ at fetching 
archives, and just assumed that the polling cannot fail.
   
   The test now instead tracks how many archives have been successfully fetched 
instead. Since we are now taking scenarios into account where the HS polls 
archives multiple times (in case of errors) the polling interval was reduced to 
100ms to prevent excessive test durations.

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