[FLINK-8887][tests] Add single retry in MiniClusterClient #5657
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What is the purpose of the change
This PR presents a test workaround for race-conditions in FLIP-6 (most notably FLINK-8887). Basically, every
MiniClusterClient
call is retried once after 500ms in case of certain exceptions.This is only a band-aid until a proper fix is in place so we can finally continue merging more test ports.
Brief change log
guardWithSingleRetry
convenience methodScheduledExecutor
toMiniClusterClient
MiniCluster
Verifying this change
The change can be verified by cherry-picking this branch and running the
AbstractOperatorRestoreTestBase
. Before this change there was always 1-2 tests failing, whereas now none should fail./cc @aljoscha @GJL