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How to stop a MR Job when a certain condition is met? - MapReduce - [mail # user]
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...Hi, Is there a way to stop an entire job when a certain condition is met in the map/reduce function? Like looking for a particular key or value. Thanks, Praveen...
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Author: Praveen Sripati,
2011-10-01, 03:39
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Re: Regarding 'branch-0.20-security' - MapReduce - [mail # dev]
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...Steve, classes can't be backported from trunk to 0.20.x. Changes there should go into 0.22 and then into 0.20-security. As far as I know, 0.22/0.20-security are on the old MR eng...
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Author: Praveen Sripati,
2011-09-30, 16:10
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Regarding 'branch-0.20-security' - MapReduce - [mail # dev]
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...Hi, There seems to be continuous changes to the 'branch-0.20-security' and also there are references to it once in a while in the mailing list. What is the significance of the 'branch-...
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Author: Praveen Sripati,
2011-09-28, 14:01
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Calculations of the InputSplits - MapReduce - [mail # dev]
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...Hi, There was a query in StackOverflow regarding high CPU on the client after submitting jobs (upto 200 jobs in batch and 150MB jar file size). Calculation of the InputSplit may be one...
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Author: Praveen Sripati,
2011-09-25, 16:42
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Re: How to pull data in the Map/Reduce functions? - MapReduce - [mail # user]
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...Matt, Neither of the books have much information about the new MR API. I was reading the 'Hadoop - The Definitive Guide' and came across a single pager on new API. I wanted to try the ...
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Author: Praveen Sripati,
2011-09-24, 16:56
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How to pull data in the Map/Reduce functions? - MapReduce - [mail # user]
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...Hi, Normally the Hadoop framework calls the map()/reduce() for each record in the input split. I read in the 'Hadoop : The Definitive Guide' that that data can be pulled using the new ...
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Author: Praveen Sripati,
2011-09-24, 13:42
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Re: Running Hadoop in different modes - MapReduce - [mail # user]
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...Harsh, I am exploring the different features of Hadoop and have setup the Stand alone mode in Eclipse and would like to know what features it does/doesn't supports. For some reason run...
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Author: Praveen Sripati,
2011-09-23, 12:30
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Running Hadoop in different modes - MapReduce - [mail # user]
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...Hi, What are the features available in the Fully-Distributed Mode and the Pseudo-Distributed Mode that are not available in the Local (Standalone) Mode? Local (Stanndalone) Mode is ver...
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Author: Praveen Sripati,
2011-09-23, 06:45
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Re: Regarding FIFO scheduler - MapReduce - [mail # user]
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...Thanks, got the point. So, the shuffle and sort can happen in parallel even before all the map tasks are completed, but the reduce happens only after all the map tasks are complete. Pr...
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Author: Praveen Sripati,
2011-09-22, 13:51
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Re: Regarding FIFO scheduler - MapReduce - [mail # user]
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...Joey, Thanks for the response. 'mapreduce.job.reduce.slowstart.completedmaps' is default set to 0.05 and says 'Fraction of the number of maps in the job which should be complete ...
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Author: Praveen Sripati,
2011-09-22, 13:38
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