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Re: SequenceFileOutputFormat - Custom Type Key & Value - HDFS - [mail # user]
...You NO need to do anything specifically to emit Text, VectorWritable into your SequenceFileOutputFormat. Rather you need to just emit the Key as Text and value as VectorWritable in your Redu...
   Author: Mahesh Balija, 2013-02-01, 16:05
Re: mappers-node relationship - HDFS - [mail # user]
...Mappers and Reducers will run in Task instances mapper/reducer instances also called as mapper/reducer slots. Each node can have multiple slots (I mean multiple mapper instances, each run in...
   Author: Mahesh Balija, 2013-01-25, 09:18
Re: How to Backup HDFS data ? - HDFS - [mail # user]
...Hi Steve,              On top of Harsh answer, other than Backup there is a feature called Snapshot offered by some third party vendors like MapR.   &...
   Author: Mahesh Balija, 2013-01-25, 07:44
[expand - 1 more] - Re: How to copy log files from remote windows machine to Hadoop cluster - HDFS - [mail # user]
...That link talks about just installing Flume on Windows machine (NOT even have configs to push logs to the Hadoop cluster), but what if I have to collect logs from various clients, then I wil...
   Author: Mahesh Balija, 2013-01-17, 11:17
Re: Compile error using contrib.utils.join package with new mapreduce API - HDFS - [mail # user]
...Hi Mike,              As I can see that DataJoinMapper/ReducerBase are implementing the Mapper and Reducer interfaces from the MapRed package. And as you a...
   Author: Mahesh Balija, 2013-01-13, 04:40
Re: Best practices forking with files in Hadop MR jobs - HDFS - [mail # user]
...One more approach I would prefer is,  c) Once your job completes processing an input file move the file to another path (say /input/processed) and then delete the files in that path aft...
   Author: Mahesh Balija, 2012-12-11, 09:55
Re: understanding performance - HDFS - [mail # user]
...Hi Peter,             Can you also track the the details like, in what nodes your mappers/reducers are running in each execution.         &n...
   Author: Mahesh Balija, 2012-12-04, 08:16
Re: Input splits for sequence file input - HDFS - [mail # user]
...Hi Jeff,              Beyond the hdfs blocks, there is something called as * InputSplit/FileSplit* (in your terms logical structure).       ...
   Author: Mahesh Balija, 2012-12-03, 06:51
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