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Re: Reg LZO compression - MapReduce - [mail # user]
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...Hi Manoj, If the data is the same for both tests and the number of mappers is fewer, then each mapper has more (uncompressed) data to process. Thus each mapper should take longer...
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Author: Robert Dyer,
2012-10-17, 03:40
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Re: New Learner for Haddop and Hive - MapReduce - [mail # user]
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...Amazon says Oct 9. http://www.amazon.com/Programming-Hive-Jason-Rutherglen/dp/1449319335 On Fri, Sep 7, 2012 at 1:11 PM, Michael Segel w rote: n st The lots 4697.out ...
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Author: Robert Dyer,
2012-09-07, 18:14
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Re: HBase and MapReduce data locality - MapReduce - [mail # user]
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...Ok but does that imply that only 1 of your compute nodes is promised to have all of the data for any given row? The blocks will replicate, but they don't necessarily all replicate to t...
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Author: Robert Dyer,
2012-08-29, 06:06
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HBase and MapReduce data locality - MapReduce - [mail # user]
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...I have been reading up on HBase and my understanding is that the physical files on the HDFS are split first by region and then by column families. Thus each column family has its own p...
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Author: Robert Dyer,
2012-08-29, 04:20
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Updating SequenceFiles? - MapReduce - [mail # user]
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...I am currently using a SequenceFile as input to my MR job (on Hadoop 1.0.3). This works great, as my input is just a bunch of binary blobs. However it seems SequenceFile is only ...
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Author: Robert Dyer,
2012-08-22, 16:07
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Re: Jobs randomly not starting - MapReduce - [mail # user]
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...Upon further inspection of that log, it appears the problem is the startup task just takes a very long time. Typically it is taking at most 6 seconds, but sometimes (the cases I think ...
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Author: Robert Dyer,
2012-07-17, 20:27
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Jobs randomly not starting - MapReduce - [mail # user]
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...I'm using Hadoop 1.0.3 on a small cluster (1 namenode, 1 jobtracker, 2 compute nodes). My input size is a sequence file of around 280mb. Generally, my jobs run just fine and all ...
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Author: Robert Dyer,
2012-07-13, 04:03
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Hadoop map task deadlocking? - MapReduce - [mail # user]
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...I am running Hadoop 1.0.3 on a small cluster (1 namenode, 1 jobtracker, 2 compute+data nodes). My input file is a SequenceFile of around 129MB consisting of Text keys and BytesWritable...
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Author: Robert Dyer,
2012-07-03, 20:44
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