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possible regression of full table scan using coprocessor in 0.94
Ted Yu 2012-12-01, 06:07
Hi, In Q&A session of my talk at Hadoop In China 2012, two people (one using 0.94.1, one using 0.94.2) mentioned that full table scan using coprocessor in 0.94 exhibited less desirable performance compared to 0.92.x
I still need to collect more concrete information on this claim.
Maybe the people who asked me this question can provide more details.
Thanks
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Ted Yu 2012-12-01, 06:07
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Re: possible regression of full table scan using coprocessor in 0.94
Andrew Purtell 2012-12-01, 09:24
It would be good if this can be substantiated with a test case that reproduces the effect noticed, or at least enough detail to write that test. As is there's not much here to go on.
On Saturday, December 1, 2012, Ted Yu wrote:
> Hi, > In Q&A session of my talk at Hadoop In China 2012, two people (one using > 0.94.1, one using 0.94.2) mentioned that full table scan using coprocessor > in 0.94 exhibited less desirable performance compared to 0.92.x > > I still need to collect more concrete information on this claim. > > Maybe the people who asked me this question can provide more details. > > Thanks > -- Best regards,
- Andy
Problems worthy of attack prove their worth by hitting back. - Piet Hein (via Tom White)
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Andrew Purtell 2012-12-01, 09:24
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