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Re: [Input split] File manipulation - Hadoop - [mail # user]
...The default split size is 64M which is the block size, and you can change it by configuration. What file type of your input file ? if it's gz , it can not been spited, and you will always ge...
   Author: Jeff Zhang, 2010-08-18, 01:37
Re: hadoop RPC Server and Client - Hadoop - [mail # user]
...There's heartbeat between jobtracker and tasktracker, namenode and datanode. Besides, tasktracker will report task progress info to jobtracker, and datanode will report block report to namen...
   Author: Jeff Zhang, 2010-08-13, 01:21
Re: MapReduce Usage in Search Engines - Hadoop - [mail # dev]
...As my understanding, google may use mapred to build index, but won't use mapred in the search phase. Because search phase need to be low latency which is not mapred's feature.   On Fri,...
   Author: Jeff Zhang, 2010-07-30, 14:18
Re: 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
Re: 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
Re: 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
Re: 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:    Best Regards  Jeff Z...
   Author: Jeff Zhang, 2010-06-29, 01:50
Re: 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
Re: Newb question on HDFS - Hadoop - [mail # user]
...change localhost.com to localhost  On Thu, Jun 24, 2010 at 12:11 PM, Blargy  wrote: son  my me and authority  at. en the file is stion-on-HDFS-tp918683p918683.html  ...
   Author: Jeff Zhang, 2010-06-24, 04:52
Re: 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 : e �Srigurunath Chakravarthi 写道� � arge job...
   Author: Jeff Zhang, 2010-06-23, 10:08
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