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From John Lilley <john.lil...@redpoint.net>
Subject HDFS performance with an without replication
Date Sun, 15 Sep 2013 17:08:44 GMT
In our YARN application, we are considering whether to store temporary data with replication=1
or replication=3 (or give the user an option).  Obviously there is a tradeoff between reliability
and performance, but on smaller clusters I'd expect this to be less of an issue.

What is the difference in write performance using replication=1 vs 3?  For reading I'd expect
the performance to be roughly requivalent.

john

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