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Announcing the first San Francisco Hadoop meetup -- Jan 12, 2011 - Hadoop - [mail # general]
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...Hadoop fans, Earlier in the month I proposed a San Francisco-based Hadoop meetup. We are pleased to announce that we will be holding this event on Wednesday, January 12, 2011 from 6pm ...
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Author: Aaron Kimball,
2010-12-01, 22:37
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Re: Branching and testing strategy for 0.22 - Hadoop - [mail # general]
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...Would it be worthwhile to give branches unique, persistent names? branch-0.22-qa1, branch-0.22-qa2, etc. Then problems in a later incarnation of the QA branch could be regression-tested agai...
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Author: Aaron Kimball,
2010-08-23, 22:26
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Re: problem starting cdh3b2 jobtracker - Hadoop - [mail # general]
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...The IOException in MRAsyncDiskService is being logged with severity level WARN; I believe that system operation continues normally despite being unable to clean some of the directories. &nbs...
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Author: Aaron Kimball,
2010-08-06, 17:18
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Re: HEP proposal - Hadoop - [mail # general]
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...Eli, Great work. I like where this is going. Here's something that I think might be problematic: 3. Copyright/public domain -- Each HEP must either be explicitly labelled a...
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Author: Aaron Kimball,
2010-07-15, 01:23
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Re: [VOTE] Release Hadoop 0.21.0 (candidate 0) - Hadoop - [mail # dev]
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...I downloaded the "combined" tarball of 0.21.0-rc0 and set it up as a pseudo-distributed Hadoop cluster. Everything seems to work; basic smoke tests pass. Did not run internal unit test...
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Author: Aaron Kimball,
2010-07-08, 18:55
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Re: Partitioned Datasets Map/Reduce - Hadoop - [mail # user]
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...One possibility: write out all the partition numbers (one per line) to a single file, then use the NLineInputFormat to make each line its own map task. Then in your mapper itself, you will g...
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Author: Aaron Kimball,
2010-07-05, 07:51
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Re: create error - Hadoop - [mail # user]
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...Is there a reason you're using that particular interface? That's very low-level. See http://wiki.apache.org/hadoop/HadoopDfsReadWriteExample for the proper API to use. - Aaron &n...
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Author: Aaron Kimball,
2010-07-05, 07:49
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Re: Text files vs. SequenceFiles - Hadoop - [mail # user]
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...David, I think you've more-or-less outlined the pros and cons of each format (though do see Alex's important point regarding SequenceFiles and compression). If everyone who worked with...
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Author: Aaron Kimball,
2010-07-05, 07:47
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Re: Can we modify files in HDFS? - Hadoop - [mail # general]
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...On Tue, Jun 29, 2010 at 2:57 AM, Steve Loughran wrote: It's my understanding that HBase stores datasets in reasonably small files (a few hundred MB each?) where deltas to a sect...
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Author: Aaron Kimball,
2010-07-05, 07:38
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Re: Displaying Map output in MapReduce - Hadoop - [mail # general]
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...If you set the number of reduce tasks to zero, the outputs of the mappers will be sent directly to the OutputFormat. You can debug your map phase of a job by disabling reduce and inspe...
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Author: Aaron Kimball,
2010-07-05, 07:34
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