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RE: help!!!,what is happened with my project? - MapReduce - [mail # user]
...Did you do a hadoop version upgrade before this error happened? Yong  Date: Wed, 11 Sep 2013 16:57:54 +0800 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] CC: [EMAIL PROTECTED] Subject: ...
   Author: java8964 java8964, 2013-09-11, 13:02
[expand - 1 more] - RE: secondary sort - number of reducers - MapReduce - [mail # user]
...Well, The reducers normally will take much longer than the mappers stage, because the copy/shuffle/sort all happened at this time, and they are the hard part. But before we simply say it is ...
   Author: java8964 java8964, 2013-08-30, 15:58
RE: copy files from hdfs to local fs - MapReduce - [mail # user]
...What's wrong by using old Unix pipe? hadoop fs -cat /user/input/foo.txt | head -100 > local_file  Date: Thu, 29 Aug 2013 13:50:37 -0700 Subject: Re: copy files from hdfs to local fs ...
   Author: java8964 java8964, 2013-08-29, 23:48
RE: Jar issue - MapReduce - [mail # user]
...I am not sure the original suggestion will work for your case. My understanding is the you want to use some API, only exists in slf4j versiobn 1.6.4, but this library with different version ...
   Author: java8964 java8964, 2013-08-27, 21:31
RE: Partitioner vs GroupComparator - MapReduce - [mail # user]
...As Harsh said, sometime you want to do the 2nd sort, but for MR, it can only be sorted by key, not by value. A lot of time, you want to the reducer output sort by a field, but only do the so...
   Author: java8964 java8964, 2013-08-23, 17:45
RE: running map tasks in remote node - MapReduce - [mail # user]
...It is possible to do what you are trying to do, but only make sense if your MR job is very CPU intensive, and you want to use the CPU resource in your cluster, instead of the IO. You may wan...
   Author: java8964 java8964, 2013-08-23, 14:11
[expand - 1 more] - RE: Question related to Decompressor interface - MapReduce - [mail # user]
...Hi, Dave: Thanks for you reply. I am not sure how the EncryptedWritable will work, can you share more ideas about it? For example, if I have a text file as my source raw file. Now I need to ...
   Author: java8964 java8964, 2013-02-10, 15:13
RE: What to do/check/debug/root cause analysis when jobtracker hang - MapReduce - [mail # user]
...Our cluster on cdh3u4 has the same problem. I think it is caused by some bugs in JobTracker. I believe Cloudera knows about this issue. After upgrading to cdh3u5, we havn't faced this issue ...
   Author: java8964 java8964, 2013-02-07, 02:12
Seekable interface and CompressInputStream question - MapReduce - [mail # user]
...Hi,  I have a question related to Seekable interface. Right now I am using the CDH3 release, with hadoop 0.20.2. I understand in it, the CompressInputStream will throw UnsupportedExcept...
   Author: java8964 java8964, 2012-12-22, 02:13
[expand - 1 more] - RE: Cumulative value using mapreduce - MapReduce - [mail # user]
...Are you allowed to change the order of the data in the output? If you want  to calculate the cr/dr indicator cumulative sum value, then it will easy  if the business allow you to c...
   Author: java8964 java8964, 2012-10-05, 14:03
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