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Re: fundamental doubt - Hadoop - [mail # user]
...Hi Jamal  It is performed at a frame work level map emits key value pairs and the framework collects and groups all the values corresponding to a key from all the map tasks. Now the red...
   Author: Bejoy KS, 2012-11-21, 20:03
Re: guessing number of reducers. - Hadoop - [mail # user]
...Hi Manoj  If you intend to calculate the number of reducers based on the input size, then in your driver class you should get the size of the input dir in hdfs and  say you intende...
   Author: Bejoy KS, 2012-11-21, 18:34
Re: Hadoop installation on mac - Hadoop - [mail # user]
...Hi Suneel  You can get the latest stable versions of hadoop from the following url  http://hadoop.apache.org/releases.html#Download  to download choose a mirror and  slec...
   Author: Bejoy KS, 2012-10-16, 12:06
Re: How to lower the total number of map tasks - Hadoop - [mail # user]
...Hi Shing  Is your input a single file or set of small files? If latter you need to use CombineFileInputFormat.   Regards Bejoy KS  Sent from handheld, please excuse typos. &nb...
   Author: Bejoy KS, 2012-10-02, 17:46
Re: Disable retries - Hadoop - [mail # user]
...Hi Marco  You can disable retries by setting mapred.map.max.attempts and mapred.reduce.max.attempts  to 1.  Also if you need to disable speculative execution. You can disable ...
   Author: Bejoy KS, 2012-08-03, 00:02
Re: Merge Reducers Output - Hadoop - [mail # user]
...Hi   Why not use 'hadoop fs -getMerge  ' while copying files out of hdfs for the end users to consume. This will merge all the files in 'outputFolderInHdfs'  into one file and...
   Author: Bejoy KS, 2012-07-31, 04:30
Re: Retrying connect to server: localhost/127.0.0.1:9000. - Hadoop - [mail # user]
...Hi Keith  Your NameNode is not up still. What does the NN logs say?  Regards Bejoy KS  Sent from handheld, please excuse typos.  From: anil gupta  Date: Fri, 27 Jul ...
   Author: Bejoy KS, 2012-07-27, 18:34
Re: fail and kill all tasks without killing job. - Hadoop - [mail # user]
...Hi Jay  Did you try hadoop job -kill-task  ? And is that not working as desired?   Regards Bejoy KS  Sent from handheld, please excuse typos.  From: jay vyas  D...
   Author: Bejoy KS, 2012-07-20, 22:23
Re: Hive/Hdfs Connector - Hadoop - [mail # user]
...Hi Sandeep  You can connect to hdfs from a remote machine if that machine is reachable from the cluster, and you have the hadoop jars and right hadoop configuration files.  Similar...
   Author: Bejoy KS, 2012-07-05, 15:12
Re: Setting number of mappers according to number of TextInput lines - Hadoop - [mail # user]
...Hi Ondrej  You can use NLineInputFormat with n set to 10.  From: OndÅ™ej Klimpera To: [EMAIL PROTECTED] ReplyTo: [EMAIL PROTECTED] Subject: Setting number of mappers according to nu...
   Author: Bejoy KS, 2012-06-16, 09:27
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