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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
[expand - 1 more] - Re: changing SequenceFile format - Hadoop - [mail # user]
...The next method has three version for three type of sequence file: non-compression, record compression and block compression) I think maybe you should write a new class for your data format ...
   Author: Jeff Zhang, 2010-09-13, 12:41
Re: Problem in copyFromLocal - Hadoop - [mail # user]
...check the data node's log to see whether it starts correctly   On Thu, Sep 9, 2010 at 8:51 AM, Medha Atre  wrote: Node_Cluster%29(as ny ut e Namesystem.java:1448) 0) ve Method) mpl...
   Author: Jeff Zhang, 2010-09-10, 01:08
Re: How to disable secondary node - Hadoop - [mail # user]
...then, do not start secondary namenode (  comment the last line of start-dfs.sh  #  "$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters start secondarynamenode )...
   Author: Jeff Zhang, 2010-09-09, 07:08
[expand - 3 more] - Re: How to rebuild Hadoop ?? - Hadoop - [mail # user]
...Matthew,  InputFormat will been used in client side, so you should combine the hadoop-0.20.2.jar and hadoop-example.jar into one single jar    On Wed, Sep 8, 2010 at 2:58 AM, ...
   Author: Jeff Zhang, 2010-09-08, 10:27
Re: change HDFS block size - Hadoop - [mail # user]
...Those lagacy files won't change block size (NameNode have the mapping between block and file) only the new added files will have the block size of 128m    On Tue, Sep 7, 2010 at 7:...
   Author: Jeff Zhang, 2010-09-08, 03:03
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