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SequenceFile split question - Hadoop - [mail # user]
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...I have a client program that creates sequencefile, which essentially merges small files into a big file. I was wondering how is sequence file splitting the data accross nodes. When I start t...
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Author: Mohit Anchlia,
2012-03-15, 00:47
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Cannot renew lease for DFSClient_977492582. Name node is in safe mode in AWS - Hadoop - [mail # user]
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...When I run client to create files in amazon HDFS I get this error. Does anyone know what it really means and how to resolve this? 2012-03-14 23:16:21,414 INFO org.apache.hadoop....
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Author: Mohit Anchlia,
2012-03-15, 00:24
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setNumTasks - Hadoop - [mail # user]
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...What is the corresponding system property for setNumTasks? Can it be used explicitly as system property like "mapred.tasks."?...
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Author: Mohit Anchlia,
2012-03-14, 15:06
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Re: mapred.tasktracker.map.tasks.maximum not working - Hadoop - [mail # user]
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...Thanks. Looks like there are some parameters that I can use at client level and others need cluster wide setting. Is there a place where I can see all the config parameters with description ...
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Author: Mohit Anchlia,
2012-03-10, 17:14
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Re: mapred.map.tasks vs mapred.tasktracker.map.tasks.maximum - Hadoop - [mail # user]
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...Is this system parameter too? Or can I specify as mapred.map.tasks? I am using pig. On Fri, Mar 9, 2012 at 6:19 PM, Chen He wrote: ...
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Author: Mohit Anchlia,
2012-03-10, 04:34
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mapred.tasktracker.map.tasks.maximum not working - Hadoop - [mail # user]
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...I have mapred.tasktracker.map.tasks.maximum set to 2 in my job and I have 5 nodes. I was expecting this to have only 10 concurrent jobs. But I have 30 mappers running. Does hadoop ignores th...
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Author: Mohit Anchlia,
2012-03-10, 01:32
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Re: mapred.map.tasks vs mapred.tasktracker.map.tasks.maximum - Hadoop - [mail # user]
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...What's the difference between setNumMapTasks and mapred.map.tasks? On Fri, Mar 9, 2012 at 5:00 PM, Chen He wrote: ...
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Author: Mohit Anchlia,
2012-03-10, 01:19
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mapred.map.tasks vs mapred.tasktracker.map.tasks.maximum - Hadoop - [mail # user]
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...What's the difference between mapred.tasktracker.reduce.tasks.maximum and mapred.map.tasks ** I want my data to be split against only 10 mappers in the entire cluster. Can I do that using on...
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Author: Mohit Anchlia,
2012-03-10, 00:42
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Re: Profiling Hadoop Job - Hadoop - [mail # user]
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...Can you check which user you are running this process as and compare it with the ownership on the directory? On Thu, Mar 8, 2012 at 3:13 PM, Leonardo Urbina wrote: ...
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Author: Mohit Anchlia,
2012-03-09, 00:10
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Re: Java Heap space error - Hadoop - [mail # user]
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...I am still trying to see how to narrow this down. Is it possible to set heapdumponoutofmemoryerror option on these individual tasks? On Mon, Mar 5, 2012 at 5:49 PM, Mohit Anchlia wrote...
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Author: Mohit Anchlia,
2012-03-06, 18:10
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