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Re: Can I switch the IP/host of NN without losing the filesystem? - MapReduce - [mail # user]
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...Thank everybody for the responses. James On Mon, Jan 7, 2013 at 12:49 PM, Robert Molina wrote: ...
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Author: Jianhui Zhang,
2013-01-07, 22:30
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Can I switch the IP/host of NN without losing the filesystem? - MapReduce - [mail # user]
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...Hadoop version: hadoop-0.20.205.0 My NN machine has 2 IP addresses and 2 hostnames assigned to them respectively. I have configured "fs.default.name" using one of the hostnames and use...
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Author: Jianhui Zhang,
2013-01-06, 07:41
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NameNode uses up (almost) all ports - MapReduce - [mail # user]
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...Hi folks, We've got this weird problem regularly on our NameNode (apache hadoop-0.20.205.0) - every couple of weeks: The JobTracker had this error: 2012-10-08 11:44:03,928 ...
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Author: Jianhui Zhang,
2012-10-29, 04:51
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How to get mapper counters (or equivalents) in reducer - MapReduce - [mail # user]
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...Hi folks, Version: Hadoop 0.20.205. My reducer can be optimized if I can get a good estimate on how many records are produced by the mappers, that is, if I can get the MAP_OUTPUT...
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Author: Jianhui Zhang,
2012-04-30, 19:02
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MR output to a file instead of directory? - MapReduce - [mail # user]
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...Hi all, The FileOutputFormat/FileOutputCommitter always treats an output path as a directory and write files under it, even if there is only one Reducer. Is there any way to configure ...
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Author: Jianhui Zhang,
2012-03-03, 00:38
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anyway to do "local" reduce like the combiner does? - MapReduce - [mail # user]
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... I have a problem at hand that seems to need "local" reducing: I have a large data input, in which each line is a data mapping, somethi ng like "name : attribute". The att...
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Author: Jianhui Zhang,
2012-01-29, 08:06
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