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Re: [VOTE] Release Apache Hadoop 0.23.1-rc1 - Hadoop - [mail # general]
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...I built a tar from the tag, ran some basic tests on a single node cluster a nd it ran just fine. I am a bit concerned about the unit tests though. I ran all of the unit tes...
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Author: Robert Evans,
2012-02-16, 21:51
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Re: Execute a Map/Reduce Job Jar from Another Java Program. - Hadoop - [mail # dev]
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...It looks like there is something wrong with your configuration where the de fault file system is coming back as the local file system, but you are pass ing in an HDFS URI fs.exists(Path), I ...
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Author: Robert Evans,
2012-02-03, 17:12
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Re: Execute a Map/Reduce Job Jar from Another Java Program. - Hadoop - [mail # dev]
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...What happens? Is there an exception, does nothing happen? I am curious. Also how did you launch your other job that is trying to run this one. The hadoop scrip...
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Author: Robert Evans,
2012-02-02, 17:32
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Re: Why $HADOOP_PREFIX ? - Hadoop - [mail # user]
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...I think it comes down to a long history of splitting and then remerging the hadoop project. I could be wrong about a lot of this so take it worth a g rain of salt. Hadoop o...
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Author: Robert Evans,
2012-02-01, 17:01
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Re: Hadoop 0.23 jars in mvn repo? - Hadoop - [mail # general]
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...Hadoop 0.23 is still considered alpha quality. I believe that is the reaso n why it is still in the snapshots repository. On 1/31/12 11:31 PM, "Edward J. Yoon" wrote: &nbs...
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Author: Robert Evans,
2012-02-01, 16:00
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Re: When to use a combiner? - Hadoop - [mail # user]
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...You can use a combiner for average. You just have to write a separate comb iner from your reducer. Class myCombiner { //The value is sum/count pairs v...
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Author: Robert Evans,
2012-01-25, 15:36
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Re: Moving TB of data from NFS to HDFS - Hadoop - [mail # dev]
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...Hadoop fs -put operates on a single thread at a time, and writes the data t o HDFS in order. Depending on the connectivity between the filer/NFS serve r and the datanodes it may be dif...
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Author: Robert Evans,
2012-01-25, 15:03
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Re: Moving TB of data from NFS to HDFS - Hadoop - [mail # dev]
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...If it is divided up into several files and you can mount your NFS directory on each of the datanodes, you could possibly use distcp to do it. I have never tried using distc...
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Author: Robert Evans,
2012-01-24, 19:09
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Re: Hadoop PIPES job using C++ and binary data results in data locality problem. - Hadoop - [mail # user]
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...I think what you want to try and do is to use JNI rather then pipes or stre aming. PIPES has known issues and it is my understanding that its use is n ow discouraged. The ideal w...
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Author: Robert Evans,
2012-01-10, 17:05
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Re: increase number of map tasks - Hadoop - [mail # user]
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...Similarly there is the NLineInputFormat that does this automatically. If y our input is small it will read in the input and make a split for every N l ines of input. Then you do...
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Author: Robert Evans,
2012-01-10, 14:57
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