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Re: Deployment of jar files at startup - MapReduce - [mail # user]
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...On 09/14/2010 10:10 PM, Pete Tyler wrote: For step 2, you have 2 options on how to implement: a) call DistributedCache.addFileToClassPath(jarFileURI, conf); b) have your app implement ...
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Author: David Rosenstrauch,
2010-09-15, 17:46
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Re: custom task cleanup even when task is killed? - MapReduce - [mail # user]
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...On 09/12/2010 02:38 AM, Chase Bradford wrote: Just like there's a "setup(Mapper.Context context)" method, there's also a "cleanup(Mapper.Context context)" method for just this pu...
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Author: David Rosenstrauch,
2010-09-13, 18:28
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Re: How to architecture large initialization in map task - MapReduce - [mail # user]
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...On 09/10/2010 02:18 AM, Angus Helm wrote: The way I handled this type of situation recently was to extract the data from the DB into an HDFS file (a SequenceFile), rather than ha...
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Author: David Rosenstrauch,
2010-09-13, 18:23
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Re: Adding log messages to src files, but they don't appear in logs ... - MapReduce - [mail # user]
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...On 09/08/2010 05:00 AM, Rita Liu wrote: Simple - Hadoop is a distributed system, designed to run on a cluster of machines. Since WordCount.java runs on your local (client) ...
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Author: David Rosenstrauch,
2010-09-08, 14:09
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Re: how to implement post-mapper processing - MapReduce - [mail # user]
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...On 08/25/2010 10:36 AM, Anfernee Xu wrote: Well then you could put your post-processing in Mapper.cleanup. http://hadoop.apache.org/common/docs/r0.20.1/api/org/apache/hadoop/mapr...
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Author: David Rosenstrauch,
2010-08-25, 15:08
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Re: how to implement post-mapper processing - MapReduce - [mail # user]
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...On 08/25/2010 09:07 AM, Anfernee Xu wrote: Couldn't you just do a "submit and wait" on your map reduce job, and then have the app that's doing the submitting do a cleanup process...
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Author: David Rosenstrauch,
2010-08-25, 14:18
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Re: hadoop 0.20 migration for JobClient? - MapReduce - [mail # user]
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...On 08/23/2010 12:25 PM, Steve Hoffman wrote: Sounds like this bug, which is fixed in Hadoop version 0.20.3. https://issues.apache.org/jira/browse/MAPREDUCE-118 DR...
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Author: David Rosenstrauch,
2010-08-23, 16:30
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Viewing counters in history job - MapReduce - [mail # user]
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...I had a job that I ran a few days ago that rolled over to the Job tracker history. Now when I go view it in the history viewer although I can see basic stats such as total ...
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Author: David Rosenstrauch,
2010-08-23, 15:30
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Configuring # task slots - MapReduce - [mail # user]
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...Was reading up a bit today on configuring the settings for # task slots, namely: mapred.tasktracker.map.tasks.maximum mapred.tasktracker.reduce.tasks.maximum Was just wonde...
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Author: David Rosenstrauch,
2010-08-19, 18:46
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Re: Null mapper? - MapReduce - [mail # user]
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...On 08/16/2010 05:48 PM, Ted Yu wrote: Um ... Sorry, but I'm not clear. Which of the 2 questions were you answering "no" to? :-) I'm guessing the first.? &...
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Author: David Rosenstrauch,
2010-08-16, 22:21
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