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Re: Where do/should .jar files live? - MapReduce - [mail # user]
...Hi Chris  In larger clusters it is better to have an edge/client node where all the user jars reside and you trigger your MR jobs from here.  A client/edge node is a server with ha...
   Author: bejoy.hadoop@..., 2013-01-23, 02:54
Re: modifying existing wordcount example - MapReduce - [mail # user]
...Hi Jamal  You can use Distributed Cache only if the file to be distributed is small. Mapreduce should be dealing with larger datasets so you should expect the output file to get larger....
   Author: bejoy.hadoop@..., 2013-01-17, 03:30
Re: Reg: No space left on device Exception - MapReduce - [mail # user]
...Hi Manoj  Go to the JT web UI, browse to the failed tasks. Identify which task threw the space related error. Ssh to that node and check the disk space on that node. Some partitions mig...
   Author: bejoy.hadoop@..., 2012-12-07, 15:37
Re: Problem using distributed cache - MapReduce - [mail # user]
...Hi Peter  Can you try the following in your code 1. Driver class to implement Tools interface 2. Do a getConfiguration() rather than creating a new conf instance.  DC should be wor...
   Author: bejoy.hadoop@..., 2012-12-07, 15:13
Re: Weird performance problem. - MapReduce - [mail # user]
...Hi      Some ares to look on - is majority of your tasks data local?  - how is the rack topology enabled? - Is the data uniformly distributed across nodes?    R...
   Author: bejoy.hadoop@..., 2012-03-16, 21:58
Re: Tracking Job completion times - MapReduce - [mail # user]
...Hi Bharath         You could be getting detailed metrics on a per job basis from the jobtracker web UI  http://:50030/jobtracker.jsp  If you drill down you can ...
   Author: bejoy.hadoop@..., 2012-03-04, 22:46
Re: reduce output compression of Terasort - MapReduce - [mail # user]
...Juwei       Is there any error messages on your TaskTracker logs related to compression like 'Codec not found' or so ?  Regards Bejoy K S  From handheld, Please excu...
   Author: bejoy.hadoop@..., 2012-02-17, 10:16
Re: num of reducer - MapReduce - [mail # user]
...Hi Tamizh          If your input comprises of text files then changing the input format to TextInputFormat can get things right. One mapper for each hdfs block. &nbs...
   Author: bejoy.hadoop@..., 2012-02-16, 16:21
Re: Good resource to learn .20 API? - MapReduce - [mail # user]
...Keith       I echo Harsh's words. The old API is the stable one and the deprication has been removed in the later releases. We do have a good number of projects in production ...
   Author: bejoy.hadoop@..., 2012-02-08, 15:39
Re: hadoop - MapReduce - [mail # user]
...Hi Satish        After changing dfs.block.size to 40 did to recopy the files. Changing dfs.block.size won't affect the existing files in hdfs it would be applicable from ...
   Author: bejoy.hadoop@..., 2012-01-10, 03:57
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