I did find this (now-fixed) bug/enhancement: https://issues.apache.org/jira/brow...

		justinsb on June 19, 2013 \| parent \| context \| favorite \| on: Spark: Open Source Superstar Rewrites Future of Bi... I did find this (now-fixed) bug/enhancement: https://issues.apache.org/jira/browse/HDFS-2246 Sounds like, with that configuration applied, the in-memory performance difference between Hadoop and Spark should not be nearly as large.