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Re: naming the output fle of reduce to the partition number - MapReduce - [mail # user]
...Please take a look at getUniqueName() method of src/mapred/org/apache/hadoop/mapred/FileOutputFormat.java It retrieves "mapred.task.partition"  On Thu, Jul 8, 2010 at 2:13 AM, Denim Liv...
   Author: Ted Yu, 2010-07-08, 17:22
Re: SerializationFactory NullPointerException - MapReduce - [mail # user]
...You should add this: job.setInputFormatClass(TextInputFormat.class);  And your TokenizerMapper should extend Mapperwrote:  ...
   Author: Ted Yu, 2010-06-30, 21:11
Re: Need help with exception when mapper emits different key class from reducer - MapReduce - [mail # user]
...There is no need to call job.setCombinerClass() Combiner is optional.  On Sat, Jun 19, 2010 at 10:01 AM, Steve Lewis  wrote:  ...
   Author: Ted Yu, 2010-06-19, 17:55
Re: trouble kick starting thriftfs - MapReduce - [mail # dev]
...You need to build the jar yourself. Refer to: http://osg-test2.unl.edu/documentation/hadoop/building-a-hadoop-release  Under hadoop-0.20.2/src/contrib/thriftfs, type: ant jar  You ...
   Author: Ted Yu, 2010-06-18, 00:10
Re: Multithreaded Mapper and Map runner - MapReduce - [mail # user]
...If only thread is created to run mapper/reducer, how would mapred.child.java.opts be effective ?  Please refer to src/mapred/org/apache/hadoop/mapred/TaskRunner.java which is not very l...
   Author: Ted Yu, 2010-06-17, 04:59
Re: Out of Memory during Reduce Merge - MapReduce - [mail # user]
.../usr/local/hadoop/hprof was an example directory name. You need to find/create a path that exists on every task tracker node.  The flags can be specified in mapred.child.java.opts  ...
   Author: Ted Yu, 2010-06-14, 22:16
Re: Setting a custom splitter and/or tracking files split? - MapReduce - [mail # user]
...Try this: FileSplit fileSplit = (FileSplit) context.getInputSplit(); String sFileName = fileSplit.getPath().getName();  On Fri, Jun 11, 2010 at 9:14 AM, Steve Lewis  wrote:  ...
   Author: Ted Yu, 2010-06-13, 03:33
Re: Split files, index files and input files - MapReduce - [mail # user]
...For 1, see http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/io/MapFile.html For 2, see http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapred/InputSplit....
   Author: Ted Yu, 2010-06-09, 21:16
Re: [RT] map reduce "pipelines" - MapReduce - [mail # dev]
...On chaining, please refer to http://hadoop.apache.org/common/docs/r0.20.2/api/org/apache/hadoop/mapred/lib/ChainReducer.html Also check out ChainMapper  See also http://www.mail-archive...
   Author: Ted Yu, 2010-06-09, 17:52
Re: TaskTracker vs TaskInProgress - MapReduce - [mail # user]
...Please refer to http://archive.cloudera.com/cdh/3/hadoop-0.20.2+228/api/org/apache/hadoop/mapred/TaskInProgress.html See method  *getTaskToRun*(String  taskTracker)   On Wed, ...
   Author: Ted Yu, 2010-06-09, 17:39
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