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Mapreduce jobconf options:webpage - Hadoop - [mail # user]
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...Hello, I came across a page, i think, on the hadoop website, listing all the mapreduce options. Does anyone have a link? Regards Saptarshi Guha...
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Author: Saptarshi Guha,
2009-03-05, 23:51
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Re: RecordReader and non thread safe JNI libraries - Hadoop - [mail # user]
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...Hello, I am quite confused and my email seems to prove it. My question is essentially, I need to use this non thread safe library in the Mapper, Reducer and RecordReader. assume, i do not cr...
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Author: Saptarshi Guha,
2009-03-02, 04:33
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RecordReader and non thread safe JNI libraries - Hadoop - [mail # user]
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...Hello, My RecordReader subclass reads from object X. To parse this object and emit records, i need the use of a C library and a JNI wrapper. public boolean next(LongWritable key, Byte...
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Author: Saptarshi Guha,
2009-03-02, 04:07
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Re: Limit number of records or total size in combiner input using jobconf? - Hadoop - [mail # user]
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...Thank you. On Fri, Feb 20, 2009 at 5:34 PM, Chris Douglas wrote:...
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Author: Saptarshi Guha,
2009-02-24, 02:36
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Limit number of records or total size in combiner input using jobconf? - Hadoop - [mail # user]
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...Hello, Running a MR job on 7 machines failed when it came to processing 53GB. Browsing the errors, org.saptarshiguha.rhipe.GRMapreduce$GRCombiner.reduce(GRMapreduce.java:149) at org.ap...
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Author: Saptarshi Guha,
2009-02-13, 14:41
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Re: Very large file copied to cluster, and the copy fails. All blocks bad - Hadoop - [mail # user]
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...Yes, exactly. Thanks! I uploaded it from an off cluster (i.e not participating in the hdfs) and it worked splendidly. Regards Saptarshi On Thu, Feb 12, 2009 at 11:03 PM, T...
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Author: Saptarshi Guha,
2009-02-13, 05:51
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Very large file copied to cluster, and the copy fails. All blocks bad - Hadoop - [mail # user]
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...hello, I have a 42 GB file on the local fs(call the machine A) which i need to copy to a HDFS (replicattion 1), according the HDFS webtracker it has 208GB across 7 machines. Note, the ...
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Author: Saptarshi Guha,
2009-02-13, 02:50
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FileInnputFormat, FileSplit, and LineRecorder: where are they run? - Hadoop - [mail # user]
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...Hello All, In order to get a better understanding of Hadoop, i've started reading the source and have a question The FileInputFormat, reads in files, splits into splitsizes (which may be big...
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Author: Saptarshi Guha,
2009-02-05, 21:24
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setNumTasksToExecutePerJvm and Configure - Hadoop - [mail # user]
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...Hello, Suppose I set setNumTasksToExecutePerJvm to -1. Then, the same jvm may run several tasks consecutively. 1) Will the configure method(if present) be run for every task? Or &nbs...
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Author: Saptarshi Guha,
2009-01-26, 17:45
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Re: NLineInputFormat and very high number of maptasks - Hadoop - [mail # user]
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...Sorry, i see - every line is now a maptask - one split,one task.(in this case N=1 line per split) Is that correct? Saptarshi On Jan 20, 2009, at 11:39 AM, Saptarshi Guha wrote: ...
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Author: Saptarshi Guha,
2009-01-20, 16:42
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