I am creating around 10 executors with 12 cores and 7g memory, but when i launch a task not all executors are being used. For example if my job has 9 tasks, only 3 executors are being used with 3 task each and i believe this is making my app slower than map reduce program for the same use case. Can any one throw some light on executor configuration if any?How can i use all the executors. I am running spark on yarn and Hadoop 2.4.0.
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