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Re: bug in streaming? - Hadoop - [mail # user]
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...Yang, I would not call it a bug, I would call it a potential optimization. The default input format for streaming will try to create one mapper per block, but if there is only on...
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Author: Robert Evans,
2012-07-03, 13:27
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Re: Dealing with changing file format - Hadoop - [mail # user]
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...There are several different ways. One of the ways is to use something like Hcatalog to track the format and location of the dataset. This may be overkill for your problem, but it...
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Author: Robert Evans,
2012-07-02, 21:17
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Re: Using REST to get ApplicationMaster info - Hadoop - [mail # user]
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...Please don't file that JIRA. The proxy server is intended to front the web server for all calls to the AM. This is so you only have to go to a single location to get to any AM's ...
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Author: Robert Evans,
2012-06-29, 15:25
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Re: JobTracker/TaskTraker heartbeats communication mechanism? - Hadoop - [mail # dev]
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...Daniel and Joao, The RPC classes in Hadoop handle this. Essentially a proxy object is create on the client side for the interface, then when a method is called in the proxy objec...
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Author: Robert Evans,
2012-06-29, 13:52
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Re: Resolving find bug issue - Hadoop - [mail # dev]
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...The issue you are running into is because you made the HOST variable public , when it was package previously. Findbugs thinks that you want HOST to be a constant because it is AL...
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Author: Robert Evans,
2012-06-26, 14:14
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Re: Is it possible to implement transpose with PigLatin/any other MR language? - Hadoop - [mail # user]
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...@Subit You can do it. Here is some pseudo code for it in map/reduce. It abuses M ap/Reduce a little to be more performent. But it is definitely doable. At ...
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Author: Robert Evans,
2012-06-22, 14:47
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Re: Is it possible to implement transpose with PigLatin/any other MR language? - Hadoop - [mail # user]
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...That may be true, I have not read through the code very closely, if you hav e multiple reduces, so you can run it with a single reduce or you can writ e a custom partitioner to do it. ...
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Author: Robert Evans,
2012-06-21, 19:26
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Re: Yahoo Hadoop Tutorial with new APIs? - Hadoop - [mail # user]
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...I am happy to announce that I was able to get the license on the Yahoo! Had oop tutorial updated from Creative Commons Attribution 3.0 Unported License to Apache 2.0. I have file...
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Author: Robert Evans,
2012-06-04, 15:05
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Re: Pragmatic cluster backup strategies? - Hadoop - [mail # user]
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...I am not an expert on the trash so you probably want to verify everything I am about to say. I believe that trash acts oddly when you try to use it t o delete a trash directory. ...
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Author: Robert Evans,
2012-05-30, 13:36
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Re: How to mapreduce in the scenario - Hadoop - [mail # user]
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...Yes you can do it. In pig you would write something like A = load ‘a.txt’ as (id, name, age, ...) B = load ‘b.txt’ as (id, address, ...) C = JOIN A BY id, B BY id; STORE C into ‘...
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Author: Robert Evans,
2012-05-29, 19:33
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