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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
Re: hadoop job progress going back - Hadoop - [mail # user]
...No, if you look at the click the job id and watch the details of this job, some task must failed.   Jeff Zhang  2009/12/27 Doopah Shaf   ues?...
   Author: Jeff Zhang, 2009-12-27, 10:28
Re: java.io.IOException: Error opening job jar - Hadoop - [mail # user]
...It seems something wrong with your jar. Can you run your jar locally ?   Jeff Zhang   On Wed, Dec 23, 2009 at 12:59 PM, Purnima Balu -X (pbalu - Linkwex at Cisco)  wrote: &nbs...
   Author: Jeff Zhang, 2009-12-27, 06:18
Re: reading sequence Files on local file system - Hadoop - [mail # user]
...The NullPointerException is because the Configuration of your FileSystem is null. So use FileSystem.getLocal(new Configuration())  instead of new LocalFileSystem()   Jeff Zhang &nb...
   Author: Jeff Zhang, 2009-12-26, 09:13
[expand - 1 more] - Re: Type mismatch in key from map - Hadoop - [mail # general]
...The KeyValueTextInputFormat is deprecated in hadoop 0.20.1, and there's a new one in trunk for new api. I think you should use part-00000 rather than part-r-00000, then you will get no IOExc...
   Author: Jeff Zhang, 2009-12-24, 04:01
Re: How to use LinkedList in Hadoop? - Hadoop - [mail # user]
...What is the activeList ? a local variable or class member variable?   On Wed, Dec 23, 2009 at 6:30 AM, oo famcr  wrote:  ...
   Author: Jeff Zhang, 2009-12-23, 14:47
[expand - 2 more] - Re: Alternative to JobConf - Hadoop - [mail # user]
...You should add the jar to the classpath of your eclipse project.  Right click the jar and choose Build path ---> Add to Build Path.  Jeff Zhang    On Fri, Dec 18, 2009...
   Author: Jeff Zhang, 2009-12-18, 17:31
RE: context.collect - Hadoop - [mail # user]
...Farhan,  In hadoop 0.20.x,  using context.write(key,value) instead of outputcollector.collect(key,value). And It's the RecordWriter in Context do the write operation.  Jeff Zh...
   Author: Jeff Zhang, 2009-12-18, 17:09
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB