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RE: Why the reducer's input group count is higher than my GroupComparator implementation - HDFS - [mail # user]
...OK.  Finally I found out the reason for this problem, after reading the Hadoop ReducerTask source code. Here is the mistake I made, and something new I learned about secondary sorting. ...
   Author: java8964 java8964, 2013-10-31, 01:30
RE: running map tasks in remote node - HDFS - [mail # user]
...If you don't plan to use HDFS, what kind of sharing file system you are going to use between cluster? NFS?For what you want to do, even though it doesn't make too much sense, but you need to...
   Author: java8964 java8964, 2013-08-22, 11:10
java.io.IOException: Task process exit with nonzero status of -1 - HDFS - [mail # user]
...Hi,  This is a 4 node hadoop cluster running on CentOS 6.3 with Oracle JDK (64bit) 1.6.0_43. Each node has 32G memory, with max 8 mapper tasks and 4 reducer tasks being set. The hadoop ...
   Author: java8964 java8964, 2013-08-15, 15:58
RE: Encryption in HDFS - HDFS - [mail # user]
...I am also interested in your research. Can you share some insight about the following questions? 1) When you use CompressionCodec, can the encrypted file split? From my understand, there is ...
   Author: java8964 java8964, 2013-02-26, 19:52
RE: Confused about splitting - HDFS - [mail # user]
...Hi, Chris: Here is my understand about the file split and Data block. The HDFS will store your file into multi data blocks, each block will be 64M or 128M depend on your setting. Of course, ...
   Author: java8964 java8964, 2013-02-10, 16:32
RE: Profiling the Mapper using hprof on Hadoop 0.20.205 - HDFS - [mail # user]
...What range you gave it for mapred.task.profile.maps? And you sure your mapper will invoke the methods you expect in the traces? Yong  Date: Wed, 6 Feb 2013 23:50:08 +0200 Subject: Profi...
   Author: java8964 java8964, 2013-02-07, 01:58
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