I'm willing to give this a shot. Let me just be sure I understand what I'd have to do: if I make it stop computing CRCs altogether, I need to make changes in the datanode as well, right? To stop checking validity of CRCs? Will this break anything interesting and unexpected?

On Oct 6, 2008, at 4:58 PM, Doug Cutting wrote:

Bryan Duxbury wrote:
I am profiling with YourKit on random reducers. I'm also running on HDFS, so I don't know how one would go about disabling CRCs.

Hack the CRC-computing code to fill things with zeros?

Doug

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