shanyu commented on issue #25705: [SPARK-29003][CORE] Fix deadlock in startup of Spark History Server URL: https://github.com/apache/spark/pull/25705#issuecomment-530219153 > What I'm concerned about is the change would also make tests skip initializing. If the test calls `updateAndCheck()`, it misses initialization. It doesn't let existing tests be broken, but brings some unintentional side-effect. Calling updateAndCheck() without start() in FsHistoryProviderSuite is fine because start() just waits for safe mode exit and for this suite of tests it is irrelevant.
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