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Re: Processing 10MB files in Hadoop - Hadoop - [mail # user]
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...The number of mapper is determined by your InputFormat. In common case, if file is smaller than one block size (which is 64M by default), one mapper for this file. if file is larger th...
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Author: Jeff Zhang,
2009-11-26, 13:57
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Re: How to handle imbalanced data in hadoop ? - Hadoop - [mail # user]
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...agree, the worst case for quick sort is O(n2) if all the data is the same. and in this case the running for heapsort is O(n*log n) Jeff Zhang On Tue, Nov 24, 2009 at 7:35 ...
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Author: Jeff Zhang,
2009-11-24, 16:09
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Re: Saving Intermediate Results from the Mapper - Hadoop - [mail # user]
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...Hi Jason, which option is for setting disable the removal of intermediate data ? Thank you Jeff Zhang On Mon, Nov 23, 2009 at 10:27 AM, Jason Venner wrote: ...
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Author: Jeff Zhang,
2009-11-23, 02:38
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Re: Starting Hadoop cluster on EC2 - Hadoop - [mail # general]
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...The ssh is installed on ec2 by default, otherwise you have no way to login to ec2 Jeff Zhang On Sun, Nov 22, 2009 at 8:09 AM, Something Something wrote: ...
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Author: Jeff Zhang,
2009-11-22, 16:19
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Re: Is the mapper output type must the same as reducer if combiner is used ? - Hadoop - [mail # user]
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...karthik, In your case, then the Combiner is not the same as Reducer. So it is not necessary to make the combiner same as reducer, right? Thank you Jeff Zhang 2009/11...
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Author: Jeff Zhang,
2009-11-22, 15:41
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Re: Starting Hadoop cluster on EC2 - Hadoop - [mail # general]
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...You can scp key-pair to ec2 machine Jeff Zhang On Sat, Nov 21, 2009 at 4:57 PM, Something Something wrote: ...
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Author: Jeff Zhang,
2009-11-22, 10:06
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Is the mapper output type must the same as reducer if combiner is used ? - Hadoop - [mail # user]
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...Hi all, As I know, Combiner is used in the mapper task, and most of the time, combiner is the same as reducer. So if combiner is used, the output type of mapper task must the sam...
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Author: Jeff Zhang,
2009-11-22, 08:27
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Re: Starting Hadoop cluster on EC2 - Hadoop - [mail # general]
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...You can scp key-pair to ec2 machine Jeff Zhang On Sat, Nov 21, 2009 at 4:57 PM, Something Something wrote: ...
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Author: Jeff Zhang,
2009-11-22, 05:38
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Re: Starting Hadoop cluster on EC2 - Hadoop - [mail # general]
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...You should scp the key-pair to EC2 machine Jeff Zhang On Sat, Nov 21, 2009 at 4:57 PM, Something Something wrote: ...
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Author: Jeff Zhang,
2009-11-22, 02:12
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Re: to get hadoop working around with multiple users on the same instance - Hadoop - [mail # user]
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...On Fri, Nov 20, 2009 at 4:39 PM, Siddu wrote: * You can still connect the machine if it run pseudo distributed file system. But in the configuration files, us...
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Author: Jeff Zhang,
2009-11-20, 09:46
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