prakharjain09 opened a new pull request #27864: [SPARK-20732][CORE] Decommission cache blocks to other executors when an executor is decommissioned URL: https://github.com/apache/spark/pull/27864 ### What changes were proposed in this pull request? After changes in SPARK-20628, CoarseGrainedSchedulerBackend can decommission an executor and stop assigning new tasks on it. We should also decommission the corresponding blockmanagers in the same way. i.e. Move the cached RDD blocks from those executors to other active executors. ### Why are the changes needed? We need to gracefully decommission the block managers so that the underlying RDD cache blocks are not lost in case the executors are taken away forcefully after some timeout (because of spotloss/pre-emptible VM etc). Its good to save as much cache data as possible. Also In future once the decommissioning signal comes from Cluster Manager (say YARN/Mesos etc), dynamic allocation + this change gives us opportunity to downscale the executors faster by making the executors free of cache data. ### Does this PR introduce any user-facing change? NO ### How was this patch tested? Added UTs.
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