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Re: Hadoop sampler related query! - Hadoop - [mail # user]
...Agreed with your explanation. One downside with your approach could be, if we collect samples from the intermediate keys on demand it might limit the partitioning to occur until all the mapp...
   Author: Mahesh Balija, 2013-04-24, 07:58
Re: namenode memory test - Hadoop - [mail # user]
...Can you manually go into the directory configured for hadoop.tmp.dir under core-site.xml and do an ls -l to find the disk usage details, it will have fsimage, edits, fstime, VERSION. or the ...
   Author: Mahesh Balija, 2013-04-24, 07:00
Re: Need help optimizing reducer - Hadoop - [mail # user]
...The reason why the reducer is fast upto 66% is be because of the Sorting and Shuffling phase of the reduce and when the actual task is NOT yet started.  The reduce side is divided into ...
   Author: Mahesh Balija, 2013-03-05, 09:00
Re: SequenceFileOutputFormat - Wrong Key Class - Hadoop - [mail # user]
...Hi Murthy,             Your InputFormat will have the LongWritable as Key and in your code you might be trying to read it as the Text rather than LongWritable t...
   Author: Mahesh Balija, 2013-02-03, 10:20
Re: Copy files from remote folder to HDFS - Hadoop - [mail # user]
...Hi Panshul,               I am also working on similar requirement, one approach is, mount your remote folder on your hadoop master node.     &nb...
   Author: Mahesh Balija, 2013-01-25, 07:31
Re: Hadoop execution sequence - Hadoop - [mail # user]
...As per the Mapreduce behavior, mapper will process all the input file(s) in parallel. i.e., no order is guaranteed among the input files. If you want to process each file separately and main...
   Author: Mahesh Balija, 2013-01-15, 14:47
Re: Best practice for storage of data that changes - Hadoop - [mail # user]
...Hi Jeff,          As HDFS paradigm is "Write once and read many" you cannot be able to update the files on HDFS.         But for your problem wha...
   Author: Mahesh Balija, 2012-11-25, 12:52
Re: Moving files - Hadoop - [mail # user]
...Hi David,         Can you check the following things,            1) Whether the user trying to rename has the filesystem permissions or NOT ...
   Author: Mahesh Balija, 2012-11-25, 12:42
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