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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
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
Re: What's HDFS's balancer criteria? - Hadoop - [mail # user]
...It's my mistake, the balancer process is so slow that make me think it balance regarding the block  Jeff Zhang  On Fri, Dec 18, 2009 at 8:36 PM, Brian Bockelman wrote:  ...
   Author: Jeff Zhang, 2009-12-18, 13:05
Re: do sth after map task finish - Hadoop - [mail # user]
...With hadoop's old API, you can make your map class extends MapReduceBase, and override the close() to do what you want. In hadoop's new API, you can create your map extends org.apache.hadoop...
   Author: Jeff Zhang, 2009-12-18, 05:42
Re: Error in cluster setup - Hadoop - [mail # user]
...Does your machines can ssh to each other ? And can open the JobTracker Web UI?  Jeff Zhang   On Fri, Dec 18, 2009 at 1:25 PM, anjali nair  wrote:  ...
   Author: Jeff Zhang, 2009-12-18, 05:35
Re: 0.18.3-14.cloudera.CH0_3 RHEL5: hadoop-site.xml properties not being read when formatting the Hadoop namenode - Hadoop - [mail # user]
...David´╝î  You should set dfs.data.dir and dfs.name.dir for HDFS.  These two directories is for the real data and meta data of file system.   Jeff Zhang   On Mon, Dec 14, 20...
   Author: Jeff Zhang, 2009-12-14, 08:58
Re: only one reduce task? - Hadoop - [mail # user]
...Mike,  Do you mean you only have one reducer task for a Job ?  You can increase the number of reducer task for one Job by setting  JobConf.setNumReduceTasks(n)   Jeff Zha...
   Author: Jeff Zhang, 2009-12-04, 00:32
Re: Object Serialization - Hadoop - [mail # user]
...As I know, Pig use object serilazation to put object into configration and then transfer it  to map and reduce task, and then map and reduce task desericalbe these object.  Could y...
   Author: Jeff Zhang, 2009-11-30, 08:34
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