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Difference between scripts for version1 and version2?

Question asked by javadba on Nov 6, 2011
Latest reply on Nov 6, 2011 by Ted Dunning

There are a series of scripts, with some named <script>  e.g. server/

Looking at them, both refer to hadoop 0.20.2 -- so it's not having to do with MRV2 which is in the 0.23.X branch.  so then what does the v2 actually mean?

Secondary question: is it (a) possible (b) advisable to use v2 versus the standard and (c) under what configuration and/or workload scenarios? If so, are there are instructions on how to do it?