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[expand - 1 more] - From X to Hadoop MapReduce - Hadoop - [mail # user]
...Cool, James. I am very interested to contribute to this. I think group by, join and order by can been added to the examples.   On Thu, Jul 22, 2010 at 4:59 AM, James Seigel  wrote:...
   Author: Jeff Zhang , 2010-07-22, 01:22
Hadoop:Pig: Update column value - Hadoop - [mail # user]
...Hi John,  It would be better if you ask the question in pig user mail list. And paste your pig script and any udf.    On Wed, Jul 7, 2010 at 7:39 AM, John Seer  wrote: &n...
   Author: Jeff Zhang , 2010-07-07, 01:06
copy files to HDFS protocols - Hadoop - [mail # user]
...1. You can use mount the files on another machine to your local machine, and invoke the copyFromLocal 2. Sure, you can write stream to HDFS, but I'm afraid you have to use Java API of hadoop...
   Author: Jeff Zhang , 2010-06-30, 09:19
Can we modify files in HDFS? - Hadoop - [mail # general]
...You can not modify file in HDFS, HDFS is designed for write once, read many times.    On Tue, Jun 29, 2010 at 8:29 AM, elton sky  wrote: > hello everyone, > > After s...
   Author: Jeff Zhang , 2010-06-29, 01:50
Connect to Hadoop Cluster from external client - Hadoop - [mail # user]
...Hadoop haven't provide API to directly connect to NameNode. The only way to communicate with NameNode is through class DFSClient    On Fri, Jun 25, 2010 at 1:23 PM, Dipy  wrot...
   Author: Jeff Zhang , 2010-06-25, 06:10
Newb question on HDFS - Hadoop - [mail # user]
...change localhost.com to localhost  On Thu, Jun 24, 2010 at 12:11 PM, Blargy  wrote: > > Hey all. Im trying to start up a psuedo distributed setup following the > direction...
   Author: Jeff Zhang , 2010-06-24, 04:52
Questions about recommendation value of the "io.sort.mb" parameter - Hadoop - [mail # dev]
...Hi 李钰  The size of map output depends on your Mapper class. The Mapper class will do processing on the input data.    2010/6/23 李钰 : > Hi Sriguru, > > Thanks a lot fo...
   Author: Jeff Zhang , 2010-06-23, 10:08
Stuck MR job - Hadoop - [mail # user]
...Dd you put the jar which contains your mapper and reducer class on your classpath ?    On Wed, Jun 23, 2010 at 5:06 PM, Vidhyashankar Venkataraman  wrote: > Hi >  This l...
   Author: Jeff Zhang , 2010-06-23, 09:40
[expand - 3 more] - Performance tuning of sort - Hadoop - [mail # user]
...The scale of each reducer depends on the Partitioner. You can think of Partitioner as a Hash Function, and the reducer as bucket, So you can not expect that each bucket has same number of it...
   Author: Jeff Zhang , 2010-06-18, 05:34
how to query JobTracker - Hadoop - [mail # user]
...Use JobClient.submitJob(JobConf job) , this method will return RunningJob. Then you can call RunningJob.isComplete() to query whether the previous job has been done.    On Thu, Jun...
   Author: Jeff Zhang , 2010-06-17, 14:42