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Re: Pairwise Comparison of Large Datasets - MapReduce - [mail # user]
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...Hi Rob, Thanks for sharing. The approach you take is similar to how Pig implements the cross product (see the cross section in: http://ofps.oreilly.com/titles/9781449302641/advanced_pi...
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Author: Vasco Visser,
2013-01-03, 00:47
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Re: mortbay, huge files and the ulimit - MapReduce - [mail # user]
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...Now that I think about it I wonder about oracle's description. [...] if more than 98% of the total time is spent in garbage collection [.. .] I took that to mean 98% of CPU time ...
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Author: Vasco Visser,
2012-09-05, 13:32
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dead links on Hadoop website - MapReduce - [mail # dev]
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...Hi, I noticed that there are quite a few dead links on the hadoop website. e.g., http://hadoop.apache.org/mapreduce/ and http://hadoop.apache.org/hdfs/ the links to the documenta...
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Author: Vasco Visser,
2012-09-05, 09:43
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Re: Improving query performance on hive and hdfs - MapReduce - [mail # user]
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...You know that Hadoop is not designed for low latency. To say anything useful I think you should share some more details: - What query are you launching (does it have join/group by) - H...
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Author: Vasco Visser,
2012-09-05, 09:21
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Re: On the topic of task scheduling - MapReduce - [mail # dev]
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...On Tue, Sep 4, 2012 at 3:11 PM, Robert Evans wrote: I agree with you that a perfect solution is not going to be feasible. The aim should probably be a solution that is good in ma...
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Author: Vasco Visser,
2012-09-04, 13:59
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Re: Questions with regard to scheduling of map and reduce tasks - MapReduce - [mail # user]
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...I am now running 2.1.0 branch where the fifo starvation is solved. FYI the behavior of task scheduling in this branch is as follows. It begins with all containers scheduled to mappers. Prett...
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Author: Vasco Visser,
2012-09-02, 16:41
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On the topic of task scheduling - MapReduce - [mail # dev]
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...Hi, I am new to the list, I am working with hadoop in the context of my MSc graduation project (has nothing to do with task scheduling per se). I came across task scheduling because I ...
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Author: Vasco Visser,
2012-09-02, 16:34
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Re: Questions with regard to scheduling of map and reduce tasks - MapReduce - [mail # user]
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...Thanks again for the reply, it is becoming clear. While on the subject of going over the code, do you know by any chance where the piece of code is that creates resource requests accor...
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Author: Vasco Visser,
2012-08-31, 11:17
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Re: Questions with regard to scheduling of map and reduce tasks - MapReduce - [mail # user]
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...FYI: the starvation issue is a known bug (https://issues.apache.org/jira/browse/MAPREDUCE-4299). Still interested in answers to the questions regarding the scheduling though. If anyone...
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Author: Vasco Visser,
2012-08-30, 23:38
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Questions with regard to scheduling of map and reduce tasks - MapReduce - [mail # user]
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...Hi, When running a job with more reducers than containers available in the cluster all reducers get scheduled, leaving no containers available for the mappers to be scheduled. The resu...
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Author: Vasco Visser,
2012-08-30, 17:41
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