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how to run jobs every 30 minutes? - Hadoop - [mail # user]
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...Hi, I'm planning to crawl a certain web site every 30 minutes. How would I get it done in Hadoop? In pure Java, I used Thread.sleep() method, but I guess this won't work in Hadoo...
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Author: edward choi,
2010-12-07, 08:55
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Re: is there no streaming.jar file in hadoop-0.21.0?? - Hadoop - [mail # user]
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...Thanks for the reply Alejandro. Appreciate it. Ed. 2010/10/5 Alejandro Abdelnur ...
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Author: edward choi,
2010-10-06, 00:14
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Re: is there no streaming.jar file in hadoop-0.21.0?? - Hadoop - [mail # user]
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...Thanks, Tom. Didn't expect the author of THE BOOK would answer my question. Very surprised and honored :-) Just one more question if you don't mind. I read it on the Internet that in order t...
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Author: edward choi,
2010-10-05, 05:55
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is there no streaming.jar file in hadoop-0.21.0?? - Hadoop - [mail # user]
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...Hi, I've recently downloaded Hadoop-0.21.0. After the installation, I've noticed that there is no "contrib" directory that used to exist in Hadoop-0.20.2. So I was wondering if there is no "...
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Author: edward choi,
2010-10-05, 03:03
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Re: Hodoop namenode startup problem - Hadoop - [mail # user]
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...I've fixed the problem. The reason namenode won't start was that I accidentally started the cluster with root account. This somehow changed the ownership of some hadoop-related files(e...
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Author: edward choi,
2010-08-05, 06:07
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Hodoop namenode startup problem - Hadoop - [mail # user]
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...I am currently stuck with hadoop namenode that won't start. When I type "start-all.sh", everything prints out fine. But when I type "jps", only JobTracker is activated. When this...
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Author: edward choi,
2010-08-05, 04:09
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Re: Inputs of Mapreduce - Hadoop - [mail # user]
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...Khaled, Hadoop mapreduce innately takes in file line by line. XML files are not comprised of single lines. So you will have to pack a single xml document into a single line. Or you can...
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Author: edward choi,
2010-07-13, 09:24
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Re: Is "heap size allocation" of namenode dynamic or static? - Hadoop - [mail # user]
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...Hemanth, Thank you for the elaborate explanation. First of all, The total swap memory size is over 4 giga bytes, but the actual used size around several hundred kilo bytes. So I guess ...
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Author: edward choi,
2010-07-09, 14:26
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Is "heap size allocation" of namenode dynamic or static? - Hadoop - [mail # user]
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...Hi, Machines in my cluster have relatively small physical memory (4GB) I was wondering if I could reduce the heap size that namenode and jobtracker are assigned. The default heap...
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Author: edward choi,
2010-07-09, 02:31
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Re: How to control the number of map tasks for each nodes? - Hadoop - [mail # user]
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...Mike, Thanks for the heads up. Actually, my i7s are 930. Does this make any difference? Ed 2010/7/9 Michael Segel ...
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Author: edward choi,
2010-07-09, 01:42
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