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Re: Hadoop overhead - Hadoop - [mail # user]
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...By default, for each task hadoop will create a new jvm process which will be the major cost in my opinion. You can customize configuration to let tasktracker reuse the jvm to eliminate the o...
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Author: Jeff Zhang,
2010-04-08, 14:37
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Re: Distributed hadoop setup 0 live datanode problem in cluster - Hadoop - [mail # user]
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...Can you post your namenode's log ? It seems that your data node can not connect to the name node. On Wed, Mar 17, 2010 at 2:43 PM, William Kang wrote: Best Regards ...
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Author: Jeff Zhang,
2010-03-17, 07:14
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How to let hadoop able to create new file in the task attempt working directory - Hadoop - [mail # user]
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...Hi all, It seems that defaultly hadoop do not allow me to create new file in task attempt working directory, (It will throws exception when I create file in mapper class). So is there ...
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Author: Jeff Zhang,
2010-03-16, 14:27
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Re: Executing jobs with other users - Hadoop - [mail # user]
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...Of course, as long as the other user is in the same user group as the hadoop user. On Wed, Mar 10, 2010 at 6:10 AM, Edson Ramiro wrote: Best Regards Jeff Zha...
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Author: Jeff Zhang,
2010-03-10, 14:44
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Re: Hadoop as master's thesis - Hadoop - [mail # user]
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...So you do not have a topic for your thesis yet ? I think the topic depends on your background, if you have machine learning experience, I suggest you can try to use hadoop to implement some ...
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Author: Jeff Zhang,
2010-03-01, 14:15
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Re: Add File Header Using FileOutputFormat - Hadoop - [mail # user]
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...write the header in setup method if you are using new hadoop API. On Sun, Feb 28, 2010 at 1:26 PM, Song Liu wrote: Best Regards Jeff Zhang...
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Author: Jeff Zhang,
2010-03-01, 01:00
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Re: How Hadoop Works?? - Hadoop - [mail # dev]
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...No, Hadoop do not use Lucene. And do you mean slor combine the Lucene and Hadoop ? On Fri, Feb 26, 2010 at 2:52 PM, wrote: Best Regards Jeff Zhang...
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Author: Jeff Zhang,
2010-02-26, 07:34
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Re: How do I get access to the Reporter within Mapper? - Hadoop - [mail # user]
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...You can use the Context for incrementing Counter or heartbeat. On Wed, Feb 24, 2010 at 7:31 AM, Raymond Jennings III <[EMAIL PROTECTED] Best Regards Jeff Zhang...
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Author: Jeff Zhang,
2010-02-24, 15:49
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Re: Job Tracker questions - Hadoop - [mail # user]
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...This is the sample code for get the counters for one specified job ( I have tested it on my cluster). What you need to change is the jobtracker address and jobID. Remember to put this ...
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Author: Jeff Zhang,
2010-02-24, 02:49
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Re: OutOfMemoryError of PIG job (UDF loads big file) - Hadoop - [mail # user]
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...Hi Jiang, you should set property *mapred.child.java.opts* in mapred-site.xml to increase the memeory as following: mapred.child.java.opts &nb...
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Author: Jeff Zhang,
2010-02-23, 02:13
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