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Reducer hanged in Selecter.select() call - MapReduce - [mail # dev]
...Our application is waiting on this piece of code for more than 37 hours. Following is the thread which is stuck:  This is the Reducer's GetMapCompletionEvent thread. All the Map task ar...
   Author: Subroto Sanyal, 2011-10-24, 11:59
RE: System.out.println in Map / Reduce - MapReduce - [mail # user]
...Hi Arko,     Request you to look into the "userlogs" folder of the corresponding task.  It will have three file sysout, syslog and syserr. Your System.out.println() will be ca...
   Author: Subroto Sanyal, 2011-09-27, 03:18
RE: Unblacklist a blacklisted tracker (at job level)? - MapReduce - [mail # user]
...Hi David,  Request you to go through the link: https://issues.apache.org/jira/browse/HADOOP-4305?focusedCommentId=12678406& page=com.atlassian.jira.plugin.system.issuetabpanels:comment-...
   Author: Subroto Sanyal, 2011-09-15, 05:24
RE: Debugging Mapreduce programs - MapReduce - [mail # user]
...Hi,     MapReduce framework provide different in built approaches to debug a Job:  1)       LocalJobRunner (Running the Job without a cluster; check basic funct...
   Author: Subroto Sanyal, 2011-09-15, 05:18
RE: Multiple files as input to a mapreduce job - MapReduce - [mail # user]
...Hi Shreya,     The functionality expected by you achieved by Hive (Internally by Mapred).   May be you can take look in Hive Join logics or can use Hive directly.  You ca...
   Author: Subroto Sanyal, 2011-09-09, 10:58
RE: Compiling programs with Hadoop 0.21.0 - MapReduce - [mail # user]
...Dear Arko,     The class org.apache.hadoop.fs.Path is available in the hadoop-common-0.21.0.jar.  into it.     The code snippet needs the hdfs and common jar for com...
   Author: Subroto Sanyal, 2011-09-02, 05:35
[expand - 2 more] - RE: RE: RE: Can reducer get parameters from mapper besides key and value? - MapReduce - [mail # user]
...Hi Jun,     I hope you want to find out the adjacent nodes of node in a graph.     I have just gone through the mapper code (not very thoroughly). I feel  the implem...
   Author: Subroto Sanyal, 2011-08-09, 13:41
[expand - 1 more] - RE: RE: Can I use the cores of each CPU to be the datanodes instead of CPU? - MapReduce - [mail # user]
...Hi Jun,     User can run multiple DataNode instances on same physical server  provided user changes the DataNode configuration.     One simple test you can try: &nbs...
   Author: Subroto Sanyal, 2011-08-08, 09:59
RE: How can I know how many mappers created? - MapReduce - [mail # user]
...Hi Jun,     Request you to go through this link:  http://wiki.apache.org/hadoop/HowManyMapsAndReduces     Following configuration may help you :  mapred.min.spl...
   Author: Subroto Sanyal, 2011-08-08, 04:32
RE: How to access contents of a Map Reduce job's working directory - MapReduce - [mail # user]
...Hi Smriti,     I would suggest you to have custom OutputCommiter which will be extension of FileOutputCommiter and will help you achieve your desired functionality.     R...
   Author: Subroto Sanyal, 2011-08-02, 10:36
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