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JVM version 1.6 vs 1.7

Question asked by tc_dev on Oct 16, 2012
Latest reply on Oct 18, 2012 by gera
I am curious if there is any hard data on the pros and cons of using JDK 1.6 vs. 1.7 (I am assuming Sun JDK), especially as far as performance and compatibility are concerned.

How much extra speed could be squeezed from running MapR on Sun JVM 1.7 vs 1.6? It seems like 1.7 could be somewhat faster but are there any compatibility risks with ecosystem components (including HBase, Mahout, etc)?

Could using different JVMs on different nodes cause any problems?