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[expand - 5 more] - Re: DFSClient: Could not complete file - Hadoop - [mail # user]
...hi Todd,  Thanks for the reply.  Yes I'm seeing > 30,000 ms a couple of times a day, though it looks like 4000 ms is average. Also see 150,000+ and lots of 50,000.  Is ther...
   Author: Chris Curtin, 2011-10-07, 19:40
Finding logs for a failed job - Hadoop - [mail # user]
...Hi,  I'm getting reports from users that a job has failed, but when I go to the console the 'failed' jobs section is clear, having been pushed out by other jobs running on the cluster. ...
   Author: Chris Curtin, 2011-04-18, 20:00
Job not exiting on data node, so cluster hangs? - Hadoop - [mail # user]
...Hi,  Our 4 node cluster has been hanging up almost every night for the last couple of weeks.  We have issues in a couple of places according to the logs.  First: INFO org.apac...
   Author: Chris Curtin, 2011-03-17, 12:17
Defining log4j settings during the submit of a job - Hadoop - [mail # user]
...Hi,  This is a little specific to Cascading and we had a good discussion about it on their list, but couldn't come up with a solution.  For those who don't know, Cascading does a l...
   Author: Chris Curtin, 2011-03-09, 16:05
NameNode question about lots of small files - Hadoop - [mail # user]
...Hi,  During our research into the 'small files' issues we are having I didn't find anything to explain what I see 'after' a change.  Before: all files were stored in a structure li...
   Author: Chris Curtin, 2010-12-16, 19:25
[expand - 2 more] - Re: Using addCacheArchive - Hadoop - [mail # user]
...The code below works fine in my 10 node EC2 cluster with the file being 'shared' created dynamically by a previous map/reduce job in the same flow.  I also programitically push the file...
   Author: Chris Curtin, 2009-07-02, 12:00
Re: Squeezing multiple datapoints out of one input line? - Hadoop - [mail # user]
...Hi Eric,  You can output multiple name/value pairs from a mapper, then reduce on each grouping.  But if you want nested or multiple map reduce jobs, take a look at Cascading (www.c...
   Author: Chris Curtin, 2009-07-01, 12:54
Re: What is the best way to use the Hadoop output data - Hadoop - [mail # user]
...Hi,  have you looked at Cascading? It gives you events ( http://www.cascading.org/userguide/htmlsingle/#N20ADF) that can call back to your code when one of your MR jobs completes. It is...
   Author: Chris Curtin, 2009-06-26, 18:50
HDFS Safemode and EC2 EBS? - Hadoop - [mail # user]
...Hi,  I am using 0.19.0 on EC2. The Hadoop execution and HDFS directories are on EBS volumes mounted to each node in my EC2 cluster. Only the install of hadoop is in the AMI. We have 10 ...
   Author: Chris Curtin, 2009-06-25, 14:51
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