Tests of S3--EC2 transfer speed using curl have shown that gigabit ethernet speeds can be reached between nodes but only when multiple transfers are overlapped. See: http://info.rightscale.com/2007/11/29/network-performance-in-ec2-and-s3

- Aaron

Toby DiPasquale wrote:
On Sat, Mar 1, 2008 at 4:19 PM, Bradford Stephens
<[EMAIL PROTECTED]> wrote:
What sort of performance hit is there for using S3 vs.  a local cluster?

In my experience on EC2 using Hadoop, S3-backed HDFS is 25-33% slower
than disk-backed HDFS. That was using 0.14.x, however, so it might be
better now...

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