Why Spark Executors Leave Cores Idle on YARN: A Packing Model for Executor Sizing

The Problem A batch Spark job on YARN can show memory nearly full and CPU half idle at the same time, and you pay for both. Memory looks full because YARN reports the memory allocated to containers, not the memory in use. CPU looks idle because the executors that fit on each node don't add up to the node's cores. The cluster is billed for every... Weiterlesen: Why Spark Executors Leave Cores Idle on YARN: A Packing Model for Exe…