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Folder not created using Hadoop Mapreduce code - MapReduce - [mail # user]
...Maybe just a silly guess, did you close your Writer? Yong  Date: Thu, 14 Nov 2013 12:47:13 +0530 Subject: Re: Folder not created using Hadoop Mapreduce code From: [EMAIL PROTECTED] To: ...
   Author: java8964 java8964 , 2013-11-14, 15:21
[expand - 2 more] - Why the reducer's input group count is higher than my GroupComparator implementation - MapReduce - [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
[expand - 1 more] - Mapreduce outputs to a different cluster? - MapReduce - [mail # user]
...Just use "hdfs://machine.domain:8080/tmp/myfolder" Yong  Date: Thu, 24 Oct 2013 20:25:35 -0700 From: [EMAIL PROTECTED] Subject: Re: Mapreduce outputs to a different cluster? To: [EMAIL ...
   Author: java8964 java8964 , 2013-10-26, 23:10
[expand - 2 more] - enable snappy on hadoop 1.1.1 - MapReduce - [mail # user]
...Thanks for your guys' help. It looks like the libhadoop.so didn't link the snappy in it, even it claims to support it in 2.1. I already created a ticket for this. I manually compiled the had...
   Author: java8964 java8964 , 2013-10-07, 13:07
Will different files in HDFS trigger different mapper - MapReduce - [mail # user]
...Hi, I have a question related to how the mapper generated for the input files from HDFS. I understand the split and blocks concept in the HDFS, but my originally understanding is that one ma...
   Author: java8964 java8964 , 2013-10-02, 20:22
File formats in Hadoop: Sequence files vs AVRO vs RC vs ORC - MapReduce - [mail # user]
...I am also thinking about this for my current project, so here I share some of my thoughts, but maybe some of them are not correct. 1) In my previous projects years ago, we store a lot of dat...
   Author: java8964 java8964 , 2013-09-30, 21:53
All datanodes are bad IOException when trying to implement multithreading serialization - MapReduce - [mail # user]
...Not exactly know what  you are trying to do, but it seems like the memory is your bottle neck, and you think you have enough CPU resource, so you want to use multi-thread to utilize CPU...
   Author: java8964 java8964 , 2013-09-30, 21:35
Extending DFSInputStream class - MapReduce - [mail # user]
...Just curious, any reason you don't want to use the DFSDataInputStream? Yong  Date: Thu, 26 Sep 2013 16:46:00 +0200 Subject: Extending DFSInputStream class From: [EMAIL PROTECTED] To: [E...
   Author: java8964 java8964 , 2013-09-26, 14:53
Hadoop sequence file's benefits - MapReduce - [mail # user]
...Hi, I have a question related to sequence file. I wonder why I should use it under what kind of circumstance? Let's say if I have a csv file, I can store that directly in HDFS. But if I do k...
   Author: java8964 java8964 , 2013-09-18, 02:29
MAP_INPUT_RECORDS counter in the reducer - MapReduce - [mail # user]
...Or you do the calculation in the reducer close() method, even though I am not sure in the reducer you can get the Mapper's count. But even you can't, here is what can do:1) Save the JobConf ...
   Author: java8964 java8964 , 2013-09-18, 02:08