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Re: DataNodeCluster - Hadoop - [mail # user]
...Hi ryan,  I think you can use MiniDFSCluster in the test package, lots of testcase of hadoop use this class to create a cluster locally. You can refer some testcase for details.   ...
   Author: Jeff Zhang, 2010-01-13, 06:37
[expand - 1 more] - Re: about translating Hadoop:The Definitive Guide into chinese one - Hadoop - [mail # general]
...Hi Wang,  This is good, I agree with the plan. And this is msn: [EMAIL PROTECTED] We can talk using IM later.    On Sat, Jan 9, 2010 at 10:32 PM, Andrew Wang wr ote:  . m...
   Author: Jeff Zhang, 2010-01-10, 06:35
RE: custom InputFormat - Hadoop - [mail # user]
...Hi valentine,  I am not sure what's your first job's OutputFormat. But I suggest you  use SequenceFileOutputFormat which will write to SequenceFile as the intermediate data store f...
   Author: Jeff Zhang, 2010-01-09, 20:06
Re: Is it possible to share a key across maps? - Hadoop - [mail # user]
...Actually you can treat the mapper task as a template design pattern, here's the persuade code:  Mapper.configure(JobConf) for each record in InputSplit:       do Mapper.m...
   Author: Jeff Zhang, 2010-01-09, 04:15
[expand - 1 more] - Re: How to reuse the nodes in blacklist ? - Hadoop - [mail # user]
...Thanks, it works.  Jeff Zhang   On Tue, Jan 5, 2010 at 5:00 PM, Amareshwari Sri Ramadasu  wrote:  ...
   Author: Jeff Zhang, 2010-01-05, 09:12
Re: how to use InputSampler & TotalOrderPartitioner? - Hadoop - [mail # user]
...Because the shuffle phase start as soon as any mapper task finish, and the shuffle phase needs the Partitioner to route the output of mapper to reducer. So the sampler must complete before t...
   Author: Jeff Zhang, 2010-01-05, 06:26
Re: Killing a Hadoop job - Hadoop - [mail # user]
...invoke command: hadoop job -kill jobID   Jeff Zhang   On Tue, Dec 29, 2009 at 10:02 PM, Mark Kerzner wrote:  ...
   Author: Jeff Zhang, 2009-12-30, 06:07
Re: Implementing VectorWritable - Hadoop - [mail # user]
...The readFields and write method is empty ?  When data is transfered from map phase to reduce phase, data is serialized and deserialized , so the write and readFields will be called. You...
   Author: Jeff Zhang, 2009-12-29, 05:55
Re: VectorWritable - Hadoop - [mail # user]
...It's easy to implement it. You can wrap a List and size (in type) into VectorWritable, and implements the Writable interface   Jeff Zhang   On Sun, Dec 27, 2009 at 8:00 PM, bharath...
   Author: Jeff Zhang, 2009-12-28, 04:21
Is there any formal document about the TFile ? - Hadoop - [mail # user]
...Hi all,  I'd like to deep into internal structure of TFile, from the javadoc and jira-HADOOP-3315, it sounds TFile is a bit like the SequenceFile, but also it has index which makes it l...
   Author: Jeff Zhang, 2009-12-27, 15:35
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