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Re: [Input split] File manipulation - Hadoop - [mail # user]
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...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...
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Author: Jeff Zhang,
2010-08-18, 01:37
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Re: [Input split] File manipulation - Hadoop - [mail # user]
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...What size is your input ? If the input size is large enough, you do not need to worry about the splitting, only one split (the last split) has the different size, all the other splits has th...
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Author: Jeff Zhang,
2010-08-17, 15:44
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Re: hadoop RPC Server and Client - Hadoop - [mail # user]
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...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...
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Author: Jeff Zhang,
2010-08-13, 01:21
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Re: MapReduce Usage in Search Engines - Hadoop - [mail # dev]
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...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,...
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Author: Jeff Zhang,
2010-07-30, 14:18
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Re: From X to Hadoop MapReduce - Hadoop - [mail # user]
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...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:...
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Author: Jeff Zhang,
2010-07-22, 01:22
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Re: From X to Hadoop MapReduce - Hadoop - [mail # user]
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...Hi James, Maybe Cascading is what you are looking for. http://www.cascading.org/ On Wed, Jul 21, 2010 at 11:36 AM, James Seigel wrote: y at somewhere pos...
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Author: Jeff Zhang,
2010-07-21, 05:34
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Re: Hadoop:Pig: Update column value - Hadoop - [mail # user]
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...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...
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Author: Jeff Zhang,
2010-07-07, 01:06
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Re: copy files to HDFS protocols - Hadoop - [mail # user]
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...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...
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Author: Jeff Zhang,
2010-06-30, 09:19
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Re: Can we modify files in HDFS? - Hadoop - [mail # general]
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...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...
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Author: Jeff Zhang,
2010-06-29, 01:50
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Re: Connect to Hadoop Cluster from external client - Hadoop - [mail # user]
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...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...
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Author: Jeff Zhang,
2010-06-25, 06:10
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