bmarcott opened a new pull request #26696: [WIP][SPARK-18886] Only reset scheduling delay timer if allocated slots are fully utilized URL: https://github.com/apache/spark/pull/26696 ### What changes were proposed in this pull request? On each resource offer, all slots are divided among the TSMs according to the scheduling policy (FIFO vs FAIR). Scheduling delay timers are then only reset if the TSM is utilizing all its slots. ### Why are the changes needed? cluster can become heavily underutilized as described in [SPARK-18886](https://issues.apache.org/jira/browse/SPARK-18886?jql=project%20%3D%20SPARK%20AND%20text%20~%20delay) ### How was this patch tested? PoolSuite TaskSchedulerImplSuite TaskSetManagerSuite
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