Github user lirui-intel commented on the pull request: https://github.com/apache/spark/pull/892#issuecomment-45468581 Hi @kayousterhout , thanks for pointing out this. My understanding is that, when TaskScheduler calls TaskSetManager.resourceOffer, it passes the parameter "maxLocality" which always starts from PROCESS_LOCAL. TaskSetManager then computes "allowedLocality" and set it to "maxLocality" if it's greater than "maxLocality". Therefore I think the allowed locality always starts from PROCESS_LOCAL.
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