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MapFileoutput Format: keys out of order when emitting in reduce (Hadoop 0.20) - Hadoop - [mail # user]
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...Hello, I re-wrote MapFileOutputFormat for use with Hadoop 0.20.1 and have a question. Suppose my Map sends key-value pairs to the reducers. In my reducer, for a given key value, i emit...
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Author: Saptarshi Guha,
2009-12-23, 20:46
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Request for access to context in partitioner - Hadoop - [mail # user]
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...Hello Is it possible for the partitioner's constructor to accept the hadoop0.20 context object? My keys can be complex and would (if possible) like to partition in say the i'th element...
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Author: Saptarshi Guha,
2009-12-10, 21:54
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Suggestion for max.mapred.map.tasks - Hadoop - [mail # user]
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...Hello, I have access to a small group of heterogenous servers: A has four cores, 16gb B : four such machines , eight Cores ,16gb C: two, each with 16 Cores and 128gb Each of thes...
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Author: Saptarshi Guha,
2009-12-10, 21:42
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Re: GC overhead limit reached when tasktrackers start - Hadoop - [mail # user]
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...Yes, this is it, because the TT's were running fine before the bad job. I cleared the directory(which took forever) and it worked Thanks Saptarshi On Mon, Nov 30, 2009 at 12:48 PM, Tod...
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Author: Saptarshi Guha,
2009-11-30, 21:32
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GC overhead limit reached when tasktrackers start - Hadoop - [mail # user]
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...Hello, While trying to start the task tracker I get the following error in the logs (see below). I'm guessing its trying to clean up an aborted job( a badly coded one) and too many files to ...
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Author: Saptarshi Guha,
2009-11-30, 16:53
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Creating Sequence File in C++ - Hadoop - [mail # user]
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...Hello, Let my Key-Value be something like BinaryWritables (my own class, but something like this). Is there a way to create the Sequence File composed of several such key - value...
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Author: Saptarshi Guha,
2009-11-28, 03:07
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Re: The name of the current input file during a map - Hadoop - [mail # user]
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...Hello again, I'm using Hadoop 0.21 and its context object e.g public void setup(Context context) { Configuration cfg = context.getConfiguration(); System.out.println("mapred.in...
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Author: Saptarshi Guha,
2009-11-26, 07:27
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Re: The name of the current input file during a map - Hadoop - [mail # user]
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...Thank you. Regards Saptarshi On Thu, Nov 26, 2009 at 2:10 AM, Amogh Vasekar wrote: ng...
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Author: Saptarshi Guha,
2009-11-26, 07:13
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The name of the current input file during a map - Hadoop - [mail # user]
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...Hello, I have a set of input files part-r-* which I will pass through another map(no reduce). the part-r-* files consist of key, values, keys being small, values fairly large(MB's) &nb...
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Author: Saptarshi Guha,
2009-11-26, 07:05
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Number of maps do not correspond to mapred.tasktracker.map.tasks.maximum - Hadoop - [mail # user]
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...Hello, I'm using Hadoop 0.21 and have mapred.tasktracker.map.task.max set to 6. Yet despite there being 1000 tasks only is being run (according to the web ui)(the corresponding one fo...
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Author: Saptarshi Guha,
2009-09-07, 22:27
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