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[SPARK-24021][CORE] fix bug in BlacklistTracker's updateBlacklistForF…
…etchFailure ## What changes were proposed in this pull request? There‘s a miswrite in BlacklistTracker's updateBlacklistForFetchFailure: ``` val blacklistedExecsOnNode = nodeToBlacklistedExecs.getOrElseUpdate(exec, HashSet[String]()) blacklistedExecsOnNode += exec ``` where first **exec** should be **host**. ## How was this patch tested? adjust existed test. Author: wuyi <email@example.com> Closes #21104 from Ngone51/SPARK-24021. (cherry picked from commit 0deaa52) Signed-off-by: Imran Rashid <firstname.lastname@example.org>
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