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Re: Best Practice: Hadoop vs Google App Engine - Hadoop - [mail # user]
...You can have more control on hadoop, you can create your own cluster with hadoop. Although hdfs's latency is high, HBase is a good choice for real time application.   Jeff Zhang   ...
   Author: Jeff Zhang, 2009-11-04, 12:39
EC2 do not support hadoop 0.18.3 - Hadoop - [mail # user]
...Hi all,  I found the the default value of HADOOP_VERSION is 0.17.0 in hadoop-ec2-env.sh of hadoop 0.18.3, and I can create hadoop 0.17.0 cluster in ec2 succesully, but I can not create ...
   Author: Jeff Zhang, 2009-10-30, 13:06
Can I install two different version of hadoop in the same cluster ? - Hadoop - [mail # user]
...Hi all,  I have installed hadoop 0.18.3 on my own cluster with 5 machines, now I want to install hadoop 0.20, but I do not run to uninstall the hadoop 0.18.3.  So what things shoul...
   Author: Jeff Zhang, 2009-10-30, 05:44
Re: What if an XML file cross boundary of HDFS chunks? - Hadoop - [mail # dev]
...Hi Steve,  When you want to read xml, you should provide your custom InputFormat which extends FileInputFormat.  and override the method isSplitable to not split a file , that mean...
   Author: Jeff Zhang, 2009-10-30, 00:42
[expand - 2 more] - Re: Need Help: The problem with text key of MapFile - Hadoop - [mail # general]
...I guess maybe HBase will be fit for you.   HBase is a distributed database built upon Hadoop. You can use the url as the row key and put other fields into columns.  then you can re...
   Author: Jeff Zhang, 2009-10-29, 02:16
Does the map task push map output to reduce task or reduce task pull it from map task - Hadoop - [mail # user]
...Hi all,  I'd like to know does the map task push map output to reduce task or reduce task pull it from map task ? Which way is real in hadoop ?  Thank you very much.   Jeff zh...
   Author: Jeff Zhang, 2009-10-27, 01:05
Do I need some distributed computing algorithm if I want to deep into source code of hadoop ? - Hadoop - [mail # user]
...Hi all,  These days, I begin look into source code hadoop. And I want to know whether I need some distributed computing algorithm if I want to deep into source code of hadoop ?   T...
   Author: Jeff Zhang, 2009-10-21, 15:16
[expand - 1 more] - Re: help with Hadoop custom Writable types implementation - Hadoop - [mail # user]
...agree, you'd better make all the fields implement Writable.  and then call their read write in your read write function.    On Thu, Oct 15, 2009 at 3:53 PM, Eason.Lee  wr...
   Author: Jeff Zhang, 2009-10-15, 08:31
Re: Reading files from local file system - Hadoop - [mail # general]
...Maybe you could debug your mapreduce job in eclipse, since you run it in local mode.    On Tue, Oct 13, 2009 at 5:56 AM, Chandan Tamrakar  wrote:  ...
   Author: Jeff Zhang, 2009-10-13, 13:49
Re: How can I run such a mapreduce program? - Hadoop - [mail # user]
...I do not think you can run jar compiled with hadoop 0.20.1 on hadoop 0.18.3  They are not compatible.    2009/10/13 杨卓荦   on 邮箱贺卡全新上线� ��...
   Author: Jeff Zhang, 2009-10-13, 03:06
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