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Re: How to process only input files containing 100% valid rows - MapReduce - [mail # user]
...With files that small it is much better to write a custom input format which checks the entire file and only passes records from good files. If you need Hadoop you are probably processing a ...
   Author: Steve Lewis, 2013-04-18, 21:50
Re: Querying a Prolog Server from a JVM during a MapReduce Job - MapReduce - [mail # user]
...Assuming that the server can handle high volume and multiple queries there is no reason not to run it on a large and powerful machine outside the cluster. Nothing prevents your mappers from ...
   Author: Steve Lewis, 2013-04-16, 21:01
Re: Java jars and MapReduce - MapReduce - [mail # user]
...A few basic questions - 1) is the rate limiting step the Java processing or storage in accumulo. Hadoop may not be able to speed up a database which is not designed to work in a distributed ...
   Author: Steve Lewis, 2013-03-02, 04:21
What resources are used by idle NameNode and JobTracker tasks - MapReduce - [mail # user]
...I have Hadoop running on 8 nodes in a 50 node cluster. The NameNode and Jobtrackers have been running for months while jobs were run occasionally - usually no more than a dozen a week and mo...
   Author: Steve Lewis, 2013-02-11, 18:07
[expand - 1 more] - Re: Running from a client machine does not work under 1.03 - MapReduce - [mail # user]
...The immediate problem is  an access exception - users like Asterix\Steve - completely unknown to the  file system cannot write files or directories.  There is another error "I...
   Author: Steve Lewis, 2012-12-08, 02:17
File permissions in HDFS - MapReduce - [mail # user]
... I am running Hadoop jobs on a cluster whose jobtracker and file system are on a machine in my network called mycluster.   conf.set("fs.default.name","hdfs://mycluster:9000"); &nbs...
   Author: Steve Lewis, 2012-12-06, 19:35
[expand - 1 more] - Re: How do find the version of Hadoop inside a running Map or reduce task - MapReduce - [mail # user]
...Thanks - that works perfectly  The following code reports the version as a counter under "Performance"        // sneaky trick to extract the version     &n...
   Author: Steve Lewis, 2012-11-05, 21:51
Hadoopn1.03 There is insufficient memory for the Java Runtime Environment to continue. - MapReduce - [mail # user]
...[We get 'There is insufficient memory for the Java Runtime Environment to continue.' any time we run any job including the most trivial word count process. It is true I am generating a jar f...
   Author: Steve Lewis, 2012-10-05, 09:50
I need help defending the use of Hadoop on a mixed use cluster - MapReduce - [mail # user]
...Another  lab has a cluster with about a thousand nodes. I have been using eight of their nodes for some hadoop development. Recently my group was offered the use of the entire cluster a...
   Author: Steve Lewis, 2012-07-30, 15:32
[expand - 1 more] - Re: Map Reduce Theory Question, getting OutOfMemoryError while reducing - MapReduce - [mail # user]
...Use a custom partitioner and grouping comparator as described here http://pkghosh.wordpress.com/2011/04/13/map-reduce-secondary-sort-does-it-all/  in effect make the time part of the ke...
   Author: Steve Lewis, 2012-06-29, 00:58
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