liupc edited a comment on issue #24167: [SPARK-27214]Upgrading locality level when task set is starving URL: https://github.com/apache/spark/pull/24167#issuecomment-483088546 @tgravescs Yes, It's better to be fixed if we can find out a graceful way. Actually, as I mentioned in the PR description, if enabled dynamic allocaiton, the idle of the executors may cause executors to be removed and not reallocate new executors until the `numExecutorsTarget` is reset. This is really bad and even can not meet the point of `Letting other parallel TSM or job use resources with locality` Ref: https://github.com/apache/spark/blob/0bb716bac38488bc216fbda29ce54e93751e641b/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala#L388 ``` // Do not request more executors if it would put our target over the upper bound if (numExecutorsTarget >= maxNumExecutors) { logDebug(s"Not adding executors because our current target total " + s"is already $numExecutorsTarget (limit $maxNumExecutors)") numExecutorsToAdd = 1 return 0 } ```
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