Github user piaozhexiu commented on the pull request:
https://github.com/apache/spark/pull/5343#issuecomment-89345472
Hive/Pig/Sqoop clients have active clients in a sense that they manage jobs
DAG (i.e. dependency of MR jobs) and adjust parallelisms between stages. But
since their DAG scheduling is far simpler than Spark DAG scheduler, they're
lightweight.
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