Github user sarutak commented on a diff in the pull request: https://github.com/apache/spark/pull/2436#discussion_r17695015 --- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala --- @@ -491,14 +491,13 @@ private[spark] class Master( val shuffledAliveWorkers = Random.shuffle(workers.toSeq.filter(_.state == WorkerState.ALIVE)) val aliveWorkerNum = shuffledAliveWorkers.size var curPos = 0 + var stopPos = aliveWorkerNum for (driver <- waitingDrivers.toList) { // iterate over a copy of waitingDrivers // We assign workers to each waiting driver in a round-robin fashion. For each driver, we // start from the last worker that was assigned a driver, and continue onwards until we have // explored all alive workers. - curPos = (curPos + 1) % aliveWorkerNum - val startPos = curPos --- End diff -- If we use numWorkersVisited and numWorkersAlive, numWorkersVisited is set to 0 before entering while loop even though still in for loop. If it's still in for loop and last visited index is N, the index of a worker which is to be visited next should be N+1.
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