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[expand - 1 more] - Re: HDFS behaving strangely - Hadoop - [mail # user]
...You may be facing the other well-known problem in Hadoop - don't use many small files:  http://www.cloudera.com/blog/2009/02/02/the-small-files-problem/  On Mon, Jan 25, 2010 at 7:...
   Author: Mark Kerzner, 2010-01-26, 03:16
Re: rmr: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete /op. Name node is in safe mode. - Hadoop - [mail # user]
...A few things may help     - delete individual files under /op    - open another terminal  I don't know why, but it helps, and then the error goes away  On Mon, ...
   Author: Mark Kerzner, 2010-01-19, 04:49
Re: which hadoop-ec2 is preferred ( cloudera/hadoop ? ) - Hadoop - [mail # user]
...My personal experience led me to prefer cloudera. Can't talk for every situation, but for me the hadoop distro had many bugs and was unreliable.  Mark  On Sun, Jan 17, 2010 at 10:5...
   Author: Mark Kerzner, 2010-01-18, 05:01
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
[expand - 1 more] - 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
[expand - 1 more] - 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
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