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Re: conf.Configuration: java.io.IOException: config(config) - Hadoop - [mail # dev]
...When running Hadoop with DEBUG logging on, this IOException was actually responsible for well-over 90% of the lines of text in my logs, making them unreadable.  We actually removed this...
   Author: Aaron Kimball, 2009-11-27, 20:09
Re: Good idea to run NameNode and JobTracker on same machine? - Hadoop - [mail # user]
...The real kicker is going to be memory consumption of one or both of these services. The NN in particular uses a large amount of RAM to store the filesystem image. I think that those who are ...
   Author: Aaron Kimball, 2009-11-27, 18:50
Re: part-00000.deflate as output - Hadoop - [mail # user]
...You are always free to run with compression disabled. But in many production situations, space or performance concerns dictate that all data sets are stored compressed, so I think Tim was as...
   Author: Aaron Kimball, 2009-11-27, 18:44
Re: RE: please help in setting hadoop - Hadoop - [mail # user]
...You've set hadoop.tmp.dir to /home/hadoop/hadoop-${user.name}.  This means that on every node, you're going to need a directory named (e.g.) /home/hadoop/hadoop-root/, since it seems as...
   Author: Aaron Kimball, 2009-11-27, 18:40
Re: error setting up hdfs? - Hadoop - [mail # user]
...You don't "need" to specify a path. If you don't specify a path argument for ls, then it uses your home directory in HDFS ("/user/"). When you first started HDFS, /user/hadoop didn't exist, ...
   Author: Aaron Kimball, 2009-11-10, 21:47
Re: How to build and deploy Hadoop 0.21 ? - Hadoop - [mail # dev]
...On Thu, Nov 5, 2009 at 2:34 AM, Andrei Dragomir  wrote:   Those are build-time dependencies. Ideally you'll ignore them post-build.    Yup.    I have created a ...
   Author: Aaron Kimball, 2009-11-09, 04:13
Re: Can I install two different version of hadoop in the same cluster ? - Hadoop - [mail # user]
...Also hadoop.tmp.dir and mapred.local.dir in your xml configuration, and the environment variables HADOOP_LOG_DIR and HADOOP_PID_DIR in hadoop-env.sh.  - Aaron  On Thu, Oct 29, 2009...
   Author: Aaron Kimball, 2009-10-30, 06:00
Re: Which FileInputFormat to use for fixed length records? - Hadoop - [mail # user]
...I think these would be good to add to mapreduce in the {{org.apache.hadoop.mapreduce.lib.input}} package. Please file a JIRA and apply a patch! - Aaron  On Wed, Oct 28, 2009 at 11:15 AM...
   Author: Aaron Kimball, 2009-10-28, 19:58
Re: How to give consecutive numbers to output records? - Hadoop - [mail # user]
...There is no in-MapReduce mechanism for cross-task synchronization. You'll need to use something like Zookeeper for this, or another external database. Note that this will greatly complicate ...
   Author: Aaron Kimball, 2009-10-28, 04:27
Re: Can I have multiple reducers? - Hadoop - [mail # user]
...If you need another shuffle after your first reduce pass, then you need a second MapReduce job to run after the first one. Just use an IdentityMapper.  This is a reasonably common situa...
   Author: Aaron Kimball, 2009-10-23, 02:54
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