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Re: Parallel Load Data into Two partitions of a Hive Table - MapReduce - [mail # user]
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...load data to different partitions parallel is OK, because it equivalent to write to different file on HDFS 2013/5/3 selva ...
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Author: Yanbo Liang,
2013-05-03, 09:08
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Re: block over-replicated - MapReduce - [mail # user]
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...You can reference this function, it remove excess replicas form the map. public void removeStoredBlock(Block block, DatanodeDescriptor node) 2013/4/12 lei liu ...
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Author: Yanbo Liang,
2013-04-15, 10:08
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Re: hadoop datanode kernel build and HDFS multiplier factor - MapReduce - [mail # user]
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...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...
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Author: Yanbo Liang,
2013-04-03, 07:15
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Re: are we able to decommission multi nodes at one time? - MapReduce - [mail # user]
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...It means that may be some replicas will be stay in under replica state? 2013/4/3 Azuryy Yu ...
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Author: Yanbo Liang,
2013-04-03, 06:04
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Re: MultipleInputs.addInputPath compile error in eclipse(indigo) - MapReduce - [mail # user]
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...You set the wrong parameter NodeReducer.class which should be subclass of Mapper rather than Reducer. 2013/4/2 YouPeng Yang ...
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Author: Yanbo Liang,
2013-04-02, 09:25
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Re: are we able to decommission multi nodes at one time? - MapReduce - [mail # user]
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...It's alowable to decommission multi nodes at the same time. Just write the all the hostnames which will be decommissioned to the exclude file and run "bin/hadoop dfsadmin -refreshNodes...
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Author: Yanbo Liang,
2013-04-01, 11:17
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Re: Any answer ? Candidate application for map reduce - MapReduce - [mail # user]
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...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...
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Author: Yanbo Liang,
2013-03-25, 09:24
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Re: On a small cluster can we double up namenode/master with tasktrackers? - MapReduce - [mail # user]
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...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 ...
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Author: Yanbo Liang,
2013-03-18, 11:11
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Re: Understand dfs.datanode.max.xcievers - MapReduce - [mail # user]
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...dfs.datanode.max.xcievers value should set across the cluster rather than particular DataNode. It means the upper bound on the number of files that the DataNode will serve at any one time. &...
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Author: Yanbo Liang,
2013-03-18, 10:23
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Re: How to Create file in HDFS using java Client with Permission - MapReduce - [mail # user]
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...You must change to user dasmohap to execute this client program otherwise you can not create file under the directory "/user/dasmohap". If you do not have a user called dasmohap at client ma...
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Author: Yanbo Liang,
2013-03-15, 09:33
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