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[SPARK-8857][SPARK-8859][Core]Add an internal flag to Accumulable and…
… send internal accumulator updates to the driver via heartbeats This PR includes the following changes: 1. Remove the thread local `Accumulators.localAccums`. Instead, all Accumulators in the executors will register with its TaskContext. 2. Add an internal flag to Accumulable. For internal Accumulators, their updates will be sent to the driver via heartbeats. Author: zsxwing <zsxwing@gmail.com> Closes apache#7448 from zsxwing/accumulators and squashes the following commits: c24bc5b [zsxwing] Add comments bd7dcf1 [zsxwing] Add an internal flag to Accumulable and send internal accumulator updates to the driver via heartbeats
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