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Is it always called part-00000? - Hadoop - [mail # user]
...Hi,  I am writing a second step to run after my first Hadoop job step finished. It is to pick up the results of the previous step and to do further processing on it. Therefore, I have t...
   Author: Mark Kerzner, 2010-01-18, 01:11
Re: Small doubt in MR - Hadoop - [mail # user]
...I think you need some kind of semaphore that you can turn on by the first reducer. For example, allocating a file in HDFS would work - if you could guarantee that it is an atomic operation (...
   Author: Mark Kerzner, 2010-01-03, 04:08
Re: Killing a Hadoop job - Hadoop - [mail # user]
...Thanks!  On Wed, Dec 30, 2009 at 12:07 AM, Jeff Zhang  wrote:  ...
   Author: Mark Kerzner, 2009-12-30, 06:10
Re: multiple jobs on the cluster? - Hadoop - [mail # user]
...Thank you. This explains why they appear to be running - they are queued.  Mark  On Tue, Dec 29, 2009 at 11:30 AM, abhishek sharma wrote:  ...
   Author: Mark Kerzner, 2009-12-29, 17:58
Re: Large Text object to String conversion - Hadoop - [mail # user]
...Bhushan,  have you considered simply raising the memory limit for Hadoop? 100M-300M is not that much, and 2 Gigs is very mode memory requirement of the today's machines. For comparison,...
   Author: Mark Kerzner, 2009-12-22, 15:28
Re: Can hadoop 0.20.1 programs runs on Amazon Elastic Mapreduce? - Hadoop - [mail # user]
...You can build your own clusters on EC2, using Cloudera's distribution. It worked for me.  Mark  On Wed, Dec 16, 2009 at 8:17 PM, Ed Kohlwey  wrote:  m> wrote: e...
   Author: Mark Kerzner, 2009-12-17, 02:23
Hadoop 0.19 on EC2 buggy? - Hadoop - [mail # user]
...Hi,  I am using Apache distribution and I am having troubles with it - HDFS corrupt, not responding, etc. Sometimes reboot helps, but on this last reboot I lost all data in HDFS. Is it ...
   Author: Mark Kerzner, 2009-12-10, 23:46
Re: Out of Java heap space - Hadoop - [mail # user]
...oops, 2048 instead of 1024 did it. Even though on my machine 1024 was enough - but that's not such a big puzzle  On Mon, Dec 7, 2009 at 6:26 PM, Mark Kerzner  wrote:  ...
   Author: Mark Kerzner, 2009-12-08, 00:47
all or nothing? - Hadoop - [mail # user]
...Hi,  MapReduce article mentions that one can tell MR how many machines to use for the job, and then you can run multiple jobs on the cluster. I believe this is not part of Hadoop, corre...
   Author: Mark Kerzner, 2009-12-04, 06:21
Re: error connecting to port 50002 - Hadoop - [mail # user]
...In the final analysis, the Apache Hadoop 0.19 cluster on EC2 sometimes has problems running after first start-up, and almost always has problems after running a job. Rebooting fixes it. &nbs...
   Author: Mark Kerzner, 2009-12-01, 03:32
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