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Re: Hardware Selection for Hadoop - MapReduce - [mail # user]
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...8 physical cores is so 2009 - 2010 :-) Intel now offers a chip w 10 physical cores on a die. You are better off thinking of 4-8 GB per physical core. It depends on what you...
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Author: Michel Segel,
2013-05-06, 11:17
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Re: Best Hadoop dev environment [WAS: RE: Few noob MR questions] - MapReduce - [mail # user]
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...I tend to use a real cluster so that I can test at a reasonable fraction of scale. I've seen some instances where code that ran 'okay' in aVM failed to perform adequately at scale. Se...
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Author: Michel Segel,
2013-04-14, 11:34
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Re: How can I record some position of context in Reduce()? - MapReduce - [mail # user]
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...Theta joins don't do we'll in any system. Are both tables large? If not its a map side join and the reducer will be just an ordinary reducer(s). Sent from a remote device. Pleas...
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Author: Michel Segel,
2013-04-12, 12:51
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Re: How can I record some position of context in Reduce()? - MapReduce - [mail # user]
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...Not sure what is meant by a non equi join. Are you saying something like for every row in X, join it to all of the rows in Y where Y.a wrote: ...
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Author: Michel Segel,
2013-04-10, 16:05
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Re: How can I record some position of context in Reduce()? - MapReduce - [mail # user]
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...Can you show an example of your join? All joins are an equality in that the key has to match. Whether its a one to one , one to many, or many to many remains to be seen. Sent from a r...
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Author: Michel Segel,
2013-04-10, 10:52
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Re: Group names for custom Counters - MapReduce - [mail # user]
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...Just a suggestion, look at dynamic counters... For the group, just create a group name and you are done. Sent from a remote device. Please excuse any typos... Mike Segel &n...
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Author: Michel Segel,
2013-03-22, 18:27
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Re: One NameNode keeps Rolling Edit Log on HDFS Federation - MapReduce - [mail # user]
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...I think part of the confusion stems from the fact that federation of name nodes only splits the very large cluster in to smaller portions of the same cluster. If you lose a federated name no...
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Author: Michel Segel,
2013-02-24, 17:53
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Re: Delivery Status Notification (Failure) - MapReduce - [mail # user]
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...I'm confused... Why is this not a general how to on Hive? Is there something special about the CDH distro? IMHO questions like these aren't distro specific, are they? -Mike ...
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Author: Michel Segel,
2013-02-14, 12:50
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Re: [OT] MapR m3 - MapReduce - [mail # user]
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...Depends on the question. Everything above MapRFS is pretty much the same. Why be a hater? Sent from a remote device. Please excuse any typos... Mike Segel On Feb 11,...
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Author: Michel Segel,
2013-02-11, 14:53
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Re: SNN - MapReduce - [mail # user]
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...Which distro? Saw this happen, way back when with a Cloudera release. Check your config files too... Sent from a remote device. Please excuse any typos... Mike Sege...
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Author: Michel Segel,
2012-09-04, 10:58
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