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Re: 0.18.3-14.cloudera.CH0_3 RHEL5: hadoop-site.xml properties not being read when formatting the Hadoop namenode - Hadoop - [mail # user]
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...David， You should set dfs.data.dir and dfs.name.dir for HDFS. These two directories is for the real data and meta data of file system. Jeff Zhang On Mon, Dec 14, 20...
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Author: Jeff Zhang,
2009-12-14, 08:58
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Re: only one reduce task? - Hadoop - [mail # user]
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...Mike, Do you mean you only have one reducer task for a Job ? You can increase the number of reducer task for one Job by setting JobConf.setNumReduceTasks(n) Jeff Zha...
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Author: Jeff Zhang,
2009-12-04, 00:32
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Re: Object Serialization - Hadoop - [mail # user]
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...As I know, Pig use object serilazation to put object into configration and then transfer it to map and reduce task, and then map and reduce task desericalbe these object. Could y...
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Author: Jeff Zhang,
2009-11-30, 08:34
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Re: Doubt in Hadoop - Hadoop - [mail # user]
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...Do you run the map reduce job in command line or IDE? in map reduce mode, you should put the jar containing the map and reduce class in your classpath Jeff Zhang On...
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Author: Jeff Zhang,
2009-11-27, 07:31
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Re: Environment for Hadoop Proto Typing - Amazon Web Services - Hadoop - [mail # dev]
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...Amazon EC2 will charge you by hours, so I think it will fit for your requirement. Jeff Zhang On Thu, Nov 26, 2009 at 1:42 PM, Palikala, Rajendra (CCL) wrote: ...
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Author: Jeff Zhang,
2009-11-27, 00:22
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Re: KeyValueTextInputFormat and Hadoop 0.20.1 - Hadoop - [mail # user]
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...It's in trunk, maybe this is not added in hadoop 0.20.1 On Thu, Nov 26, 2009 at 8:13 AM, Matthias Scherer <Matthias.Scherer@1und1.d e red/org/apache/hadoop/mapreduce/li...
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Author: Jeff Zhang,
2009-11-26, 16:18
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Re: Processing 10MB files in Hadoop - Hadoop - [mail # user]
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...Quote from the wiki doc *The number of map tasks can also be increased manually using the JobConf's conf.setNumMapTasks(int num). This can be used to increase the number of map tasks, ...
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Author: Jeff Zhang,
2009-11-26, 16:05
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Re: Processing 10MB files in Hadoop - Hadoop - [mail # user]
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...Actually, you do not need to set the number of map task, the InputFormat will compute it for you according your input data set. Jeff Zhang On Thu, Nov 26, 2009 at 7:39 AM, Cubic...
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Author: Jeff Zhang,
2009-11-26, 15:41
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Re: KeyValueTextInputFormat and Hadoop 0.20.1 - Hadoop - [mail # user]
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...There's a KeyValueInputFormat under package org.apache.hadoop.mapreduce.lib.input which is for hadoop new API Jeff Zhang On Thu, Nov 26, 2009 at 7:10 AM, Matthias Scherer <[...
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Author: Jeff Zhang,
2009-11-26, 15:34
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Re: Good idea to run NameNode and JobTracker on same machine? - Hadoop - [mail # user]
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...It depends on the size of your cluster. I think you can combine them together if your cluster has less than 10 machines. Jeff Zhang On Thu, Nov 26, 2009 at 6:26 AM, Raym...
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Author: Jeff Zhang,
2009-11-26, 15:01
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