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Re: AW: How to process only input files containing 100% valid rows - MapReduce - [mail # user]
...Matthias,  As far as I know, there are no guarantees on when counters will be updated during the job. One thing you can do is to write a metadata file along with your parsed events list...
   Author: MARCOS MEDRADO RUBINELLI, 2013-04-19, 11:21
Re: Physically moving HDFS cluster to new - MapReduce - [mail # user]
...Here's a rough guideline:  Moving a cluster isn't all that different from upgrading it. The initial steps are the same: - stop your mapreduce services - switch you namenode to safe mode...
   Author: MARCOS MEDRADO RUBINELLI, 2013-04-18, 12:36
Re: HW infrastructure for Hadoop - MapReduce - [mail # user]
...Tadas,  "Hadoop Operations" has pretty useful, up-to-date information. The chapter on hardware selection is available here: http://my.safaribooksonline.com/book/databases/hadoop/9781449...
   Author: MARCOS MEDRADO RUBINELLI, 2013-04-16, 10:27
Re: UNDERSTANDING HADOOP PERFORMANCE - MapReduce - [mail # user]
...dfs.namenode.handler.count and dfs.datanode.handler.count control how many concurrent threads the server will have to handle incoming requests. The default values should be fine for smaller ...
   Author: MARCOS MEDRADO RUBINELLI, 2013-04-11, 11:14
Re: jps show nothing but hadoop still running - MapReduce - [mail # user]
...It's a limitation of jps: it will only show processes run as the current user. Try using "sudo -u hdfs jps". This also means that you will have to sudo as the appropriate user to run the sto...
   Author: MARCOS MEDRADO RUBINELLI, 2013-04-11, 10:31
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