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Re: openssh - can't achieve passphraseless ssh - Hadoop - [mail # user]
...Another sneaky permissions requirement is that ~/.ssh/ itself must be mode 0750 or more strict.  - Aaron  On Wed, Oct 21, 2009 at 2:47 PM, Edward Capriolo wrote:  ...
   Author: Aaron Kimball, 2009-10-22, 04:27
Re: streaming data from HDFS outside of hadoop - Hadoop - [mail # user]
...You shouldn't directly instantiate and intialize FileSystem implementations; there's a factory method you should use.  Do instead:  private void initHadoop(String ip, int port) thr...
   Author: Aaron Kimball, 2009-10-21, 05:02
Re: How can I run such a mapreduce program? - Hadoop - [mail # user]
...If you're working with the Cloudera distribution, you can install CDH1 (0.18.3) and CDH2 (0.20.1) side-by-side on your development machine.  They'll install to /usr/lib/hadoop-0.18 and ...
   Author: Aaron Kimball, 2009-10-17, 06:55
Re: Error in FileSystem.get() - Hadoop - [mail # user]
...Bhupesh: If you use FileSystem.newInstance(), does that return the correct object type? This sidesteps CACHE. - A  On Thu, Oct 15, 2009 at 3:07 PM, Bhupesh Bansal wrote:  ...
   Author: Aaron Kimball, 2009-10-15, 22:51
Re: Locality when placing Map tasks - Hadoop - [mail # user]
...Map tasks are generated based on InputSplits. An InputSplit is a logical description of the work that a task should use. The array of InputSplit objects is created on the client by the Input...
   Author: Aaron Kimball, 2009-10-06, 22:20
Re: FileSystem Caching in Hadoop - Hadoop - [mail # user]
...Edward,  Interesting concept. I imagine that implementing "CachedInputFormat" over something like memcached would make for the most straightforward implementation. You could store 64MB ...
   Author: Aaron Kimball, 2009-10-06, 22:12
Re: Easiest way to pass dynamic variable to Map Class - Hadoop - [mail # user]
...You can set these in the JobConf when you're creating the MapReduce job, and then read them back in the configure() method of the Mapper class.  - Aaron  On Mon, Oct 5, 2009 at 4:5...
   Author: Aaron Kimball, 2009-10-05, 23:52
Re: Is it OK to run with no secondary namenode? - Hadoop - [mail # user]
...Quite possible. :\ - A  On Thu, Oct 1, 2009 at 5:17 PM, Mayuran Yogarajah  wrote:  ...
   Author: Aaron Kimball, 2009-10-05, 19:23
Re: Prepare input data for Hadoop - Hadoop - [mail # user]
...Use an external database (e.g., mysql) or some other transactional bookkeeping system to record the state of all your datasets (STAGING, UPLOADED, PROCESSED)  - Aaron   On Thu, Sep...
   Author: Aaron Kimball, 2009-09-22, 22:53
Re: SequenceFileAsBinaryOutputFormat for M/R - Hadoop - [mail # user]
...In the 0.20 branch, the common best-practice is to use the old API and ignore deprecation warnings. When you get to 0.22, you'll need to convert all your code to use the new API.  There...
   Author: Aaron Kimball, 2009-09-22, 22:52
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