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Re: building hadoop 2.x from source - MapReduce - [mail # user]
...You can use maven to compile and package Hadoop and deploy it to one cluster, then run it with script supplied by Hadoop. And this tutorial for your reference http://svn.apache.org/repos/asf...
   Author: Yanbo Liang, 2013-12-27, 16:00
Re: Split the File using mapreduce - MapReduce - [mail # user]
...Did you installed Hive on your Hadoop cluster? If yes, use Hive SQL may be simple and efficiency. Otherwise, you can write a MapReduce program with org.apache.hadoop.mapred.lib.MultiOuputFor...
   Author: Yanbo Liang, 2013-12-27, 14:53
Re: How to execute wordcount with compression? - MapReduce - [mail # user]
...Compression is irrelevant with yarn. If you want to store files with compression, you should compress the file when they were load to HDFS. The files on HDFS were compressed according to the...
   Author: Yanbo Liang, 2013-10-18, 12:22
Re: Parallel Load Data into Two partitions of a Hive Table - MapReduce - [mail # user]
...load data to different partitions parallel is OK, because it equivalent to write to different file on HDFS   2013/5/3 selva  ...
   Author: Yanbo Liang, 2013-05-03, 09:08
Re: block over-replicated - MapReduce - [mail # user]
...You can reference this function, it remove excess replicas form the map.     public void removeStoredBlock(Block block, DatanodeDescriptor node)   2013/4/12 lei liu  ...
   Author: Yanbo Liang, 2013-04-15, 10:08
Re: hadoop datanode kernel build and HDFS multiplier factor - MapReduce - [mail # user]
...I have done similar experiment for tuning hadoop performance. Many factors will influence the performance such as hadoop configuration, JVM, OS.  For Linux kernel related factors, we ha...
   Author: Yanbo Liang, 2013-04-03, 07:15
Re: are we able to decommission multi nodes at one time? - MapReduce - [mail # user]
...It means that may be some replicas will be stay in under replica state?   2013/4/3 Azuryy Yu  ...
   Author: Yanbo Liang, 2013-04-03, 06:04
Re: MultipleInputs.addInputPath compile error in eclipse(indigo) - MapReduce - [mail # user]
...You set the wrong parameter NodeReducer.class which should be subclass of Mapper rather than Reducer.   2013/4/2 YouPeng Yang  ...
   Author: Yanbo Liang, 2013-04-02, 09:25
Re: Any answer ? Candidate application for map reduce - MapReduce - [mail # user]
...application, and merge the processed chunks to get A back" is just suit for the MapReduce paradigm. First you can feed the split chunks to Mapper and merge the processed chunks at Reducer. W...
   Author: Yanbo Liang, 2013-03-25, 09:24
Re: On a small cluster can we double up namenode/master with tasktrackers? - MapReduce - [mail # user]
...I think it is inadvisable to put NameNode and Master(JobTracker) placed in the same machine, because the two one are resource intensive applications.  2013/3/18 David Parks  ...
   Author: Yanbo Liang, 2013-03-18, 11:11
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