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Re: 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] - Re: 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: om different classes? Is there like a spacial way to search Java APIs? d hadoop-0...
   Author: Jeff Zhang, 2010-11-12, 02:22
Re: 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
Re: 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
Re: 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
Re: 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
Re: 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
Re: 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
Re: Number of Mappers - Hadoop - [mail # general]
...Hi Rahul,  You can not determined set the mapper number as reducer number. The mapper number is determined by the your InputFormat. If you are using PigStorage, then the InputFormat is ...
   Author: Jeff Zhang, 2010-09-15, 01:22
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB