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how to perform dfs -ls as a request from www - Hadoop - [mail # user]
...If you are using Java Servlet, then you can use HDFS Java API directly.   Use FileSystem.listStatus instead of call shell, and put core-site.xml hdfs-site.xml on your classpath.  I...
   Author: Jeff Zhang , 2010-11-12, 02:30
[expand - 1 more] - JobConf - Hadoop - [mail # user]
...Sorry, I do not get your point. What do you mean ?   On Fri, Nov 12, 2010 at 1:57 AM, maha  wrote: > Thanks Jeff :) How could you recall all possible readInputFile methods from ...
   Author: Jeff Zhang , 2010-11-12, 02:22
mapper and reducer scheduling - Hadoop - [mail # dev]
...TaskTracker will tell JobTracker how many free slots it has through heartbeat. And JobTracker will choose the best tasktracker with the consideration of data locality.   On Thu, Oct 28,...
   Author: Jeff Zhang , 2010-10-29, 07:15
How about hadoop world 2010 ? - Hadoop - [mail # user]
...Hi all,  I haven't the opportunity to attend the hadoop world 2010, but still curious to know the conference and hear the voice from the attendees. And it would be better if someone can...
   Author: Jeff Zhang , 2010-10-19, 16:46
Corrupted input data to map - Hadoop - [mail # user]
...You can read the input as plain text then do type conversion in mapper, if there's NumberFormatException happens, you can decide how to do with it , like add a customized Counter to record i...
   Author: Jeff Zhang , 2010-10-16, 01:21
another quick question - Hadoop - [mail # user]
...Hi Maha ,  I don't think the hadoop.tmp.dir relates the problem of web ui. The web ui is bind to 0.0.0.0:50070 And localhost is mapped to 127.0.0.1 of your home machine in your client s...
   Author: Jeff Zhang , 2010-10-06, 21:41
how to set diffent VM parameters for mappers and reducers? - Hadoop - [mail # user]
...You can set mapred.child.java.opts in mapred-site.xml  BTW, combiner can been run both in map side and reduce side     On Tue, Oct 5, 2010 at 8:59 PM, Vitaliy Semochkin  ...
   Author: Jeff Zhang , 2010-10-05, 13:14
Help!!The problem about Hadoop - Hadoop - [mail # user]
...Hi Jander,  Hadoop has overhead compared to single-machine solution. How many task have you get when you run your hadoop job ? And what is time consuming for each map and reduce task ? ...
   Author: Jeff Zhang , 2010-10-05, 08:28
readFields() throws a NullPointerException - Hadoop - [mail # general]
...Do you have a no-argument constructor for your customer class and in the constructor do you do initialize the members ? Otherwise these members in your customer class will be null.   On...
   Author: Jeff Zhang , 2010-09-20, 01:34
[HADOOP-6957] Return bindAdrress directly rather than get it from ServerSocketChannel in Listener's getAddress() method - Hadoop - [issue]
...I am trying to make Pseudo-Distributed hadoop can been accessed by outside, I change the fs.default.name to 0.0.0.0.:9000 , but still failed. Finally I found that the problem is caused by th...
http://issues.apache.org/jira/browse/HADOOP-6957    Author: Jeff Zhang , 2010-09-18, 12:37