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Re: Heap Size question. - Hadoop - [mail # user]
...The values show you the maximum heap size and currently used heap of the job  tracker, not running jobs. Furthermore, the HADOOP_HEAPSIZE setting only se ts the maximum heap for the dae...
   Author: Joey Echeverria, 2011-06-01, 12:01
Re: Starting JobTracker Locally but binding to remote Address - Hadoop - [mail # user]
...The problem is that start-all.sh isn't all that intelligent. The way that start-all.sh works is by running start-dfs.sh and start-mapred.sh. The start-mapred.sh script always starts a job tr...
   Author: Joey Echeverria, 2011-05-31, 21:18
Re: Is it safe to manually copy BLK files? - Hadoop - [mail # user]
...The short answer is no. If you want to decommission a datanode, the safest way is to put hostnames of the datanodes you want to shutdown into a file on the namenode.  Next, set the dfs....
   Author: Joey Echeverria, 2011-05-31, 00:36
Re: I can't see this email ... So to clarify .. - Hadoop - [mail # user]
...Try moving the the configuration to hdfs-site.xml.  One word of warning, if you use /tmp to store your HDFS data, you risk data loss. On many operating systems, files and directories in...
   Author: Joey Echeverria, 2011-05-25, 02:25
[expand - 1 more] - Re: What's the easiest way to count the number of <Key, Value> pairs in a directory? - Hadoop - [mail # user]
...Are you storing the data in sequence files?  -Joey  On Fri, May 20, 2011 at 10:33 AM, W.P. McNeill  wrote: zed ay    Joseph Echeverria Cloudera, Inc. 443.305.9434...
   Author: Joey Echeverria, 2011-05-20, 17:36
[expand - 1 more] - Re: Can I number output results with a Counter? - Hadoop - [mail # user]
...Counters are a way to get status from your running job. They don't increment a global state. They locally save increments and periodically report those increments to the central counter. Tha...
   Author: Joey Echeverria, 2011-05-20, 17:34
[expand - 1 more] - Re: Can I use InputSampler.RandomSampler on data with non-Text keys? - Hadoop - [mail # user]
...Filing a bug is a great idea. InputSampler is in the MapReduce hadoop sub-project which has it's own Jira project:  https://issues.apache.org/jira/browse/MAPREDUCE  -Joey  On ...
   Author: Joey Echeverria, 2011-05-19, 16:32
[expand - 4 more] - Re: REPOST: How to adapt bin/hdfs for executing from outside $HADOOP_HOME/bin? - Hadoop - [mail # user]
...The hadoop script in 0.20.x probably has all of the features that the hdfs script in 0.21.x has (plus the functionality of the mapred script). Give this a try and see if you get any errors. ...
   Author: Joey Echeverria, 2011-05-19, 15:34
Re: Reducer granularity and starvation - Hadoop - [mail # user]
...The one advantage you would get with a large number of reducers is that the scheduler will be able to give open reduce slots to other jobs without having to be preemptive.  This will re...
   Author: Joey Echeverria, 2011-05-19, 01:01
Re: Are hadoop fs commands serial or parallel - Hadoop - [mail # user]
...The sequence file writer definitely does it serially as you can only ever write to the end of a file in Hadoop.  Doing copyFromLocal could write multiple files in parallel (I'm not sure...
   Author: Joey Echeverria, 2011-05-18, 03:32
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