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What is the role of hadoop-core-*.jar? - MapReduce - [mail # dev]
...Hello, everyone! As you can see in the title, I am curious about the exact role of thehadoop-core-*.jar file. At first I thought it contains every compiled hadoop source files, so ...
   Author: Yoonmin Nam, 2014-01-28, 09:00
RE: how to set org.apache.hadoop classpath? - MapReduce - [mail # dev]
...Hello, Harsh!I am Yoonmin from South Korea.I have a question for you about hadoop classpath.My hadoop home folder is same in all nodes in my cluster :/home/hadoop/hadoop-1.2.1Then, I compile...
   Author: Yoonmin Nam, 2014-01-28, 04:49
Changing code is not affect - MapReduce - [mail # dev]
...Hello, everyone!     I changed the tasktracker.java especially adding special LOG for debugging.  (in main function in TaskTracker.java, I added "LOG.info("Hello!");")   ...
   Author: Yoonmin Nam, 2013-12-24, 02:56
How can I inject a custom counter in internal of MapReduce engine? - MapReduce - [mail # dev]
...Hello, guys.     I want to inject a custom counters in MapReduce Framework group in MapTask.java and ReduceTask.java.  (Like MAP_INPUT_RECORDS)  So, first I wrote my thre...
   Author: Yoonmin Nam, 2013-12-20, 04:51
How can I get the spill time of each task? - MapReduce - [mail # dev]
...Hi.     I want to get exact time spent to spill a map output into disk.  Especially, the time spent to flush method in MapTask.java     It actually easy job when I u...
   Author: Yoonmin Nam, 2013-12-14, 08:03
Printing custom counter and stdout log is failed in MapReduce engine - MapReduce - [mail # dev]
...I tried to make a my counter to check the operation time of Maptask.run and ReduceTask.run using global counter or even LOG.info().     In a pseudo-distributed mode, using builded ...
   Author: Yoonmin Nam, 2013-12-13, 03:52
About documentation in apache hadoop site - MapReduce - [mail # dev]
...Hi, I am Yoonmin from DGIST, South Korea.     I found some typo in   http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/Clus terSetup.html     I...
   Author: Yoonmin Nam, 2013-10-24, 16:31
(Re)About block splitting, input split and TextInputFormat in MapReduce - MapReduce - [mail # dev]
...Hi.  Let we consider this situation:  1.     Block size = 67108864 (64MB)  2.     Data size = 2.2GB. (larger than block size)     Then, when I pu...
   Author: Yoonmin Nam, 2013-10-17, 15:21
About block splitting, input split and TextInputFormat in MapReduce - MapReduce - [mail # dev]
...Hi.  Let we consider this situation:  1.     Block size = 67108864 (64MB)  2.     Data size = 2.2GB. (larger than block size)     Then, when I pu...
   Author: Yoonmin Nam, 2013-10-17, 15:17
The work-process file creation and block generation and InputSplit generation - MapReduce - [mail # dev]
...Hello.        I want to see every detail of      1)     Block generation on hdfs when I put the file which has size over at  lease 64MB. &nb...
   Author: Yoonmin Nam, 2013-10-08, 10:41
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