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Re: Stuck MR job - Hadoop - [mail # user]
...Dd you put the jar which contains your mapper and reducer class on your classpath ?    On Wed, Jun 23, 2010 at 5:06 PM, Vidhyashankar Venkataraman  wrote: help.. y configs (pr...
   Author: Jeff Zhang, 2010-06-23, 09:40
Re: Performance tuning of sort - Hadoop - [mail # user]
...The scale of each reducer depends on the Partitioner. You can think of Partitioner as a Hash Function, and the reducer as bucket, So you can not expect that each bucket has same number of it...
   Author: Jeff Zhang, 2010-06-18, 05:34
Re: how to query JobTracker - Hadoop - [mail # user]
...Use JobClient.submitJob(JobConf job) , this method will return RunningJob. Then you can call RunningJob.isComplete() to query whether the previous job has been done.    On Thu, Jun...
   Author: Jeff Zhang, 2010-06-17, 14:42
Re: job execution - Hadoop - [mail # user]
...There's a class org.apache.hadoop.mapred.jobcontrol.Job which is a wapper of JobConf. And You and dependent jobs to it. Then put it to JobControl.     On Mon, Jun 14, 2010 at 9:55 ...
   Author: Jeff Zhang, 2010-06-15, 01:43
Re: Hadoop code execution!! - Hadoop - [mail # user]
...You should put hadoop-*.core.jar on your classpath. and initialize your FileSystem by the following method public static FileSystem get(URI uri, Configuration conf)  You can make the ur...
   Author: Jeff Zhang, 2010-06-12, 07:08
How to force the replication ? - Hadoop - [mail # general]
...Hi all I change the replication of file by using command : bin/hadoop setrep But when I use fsck to check the status of the file, it always shows that the one replica of this file is missing...
   Author: Jeff Zhang, 2010-06-07, 05:34
Re: Setting up a second cluster and getting a weird issue - Hadoop - [mail # user]
...It is not suggested to deploy hadoop on NFS, there will be conflict between data nodes, because NFS share the same namespace of file system.    On Thu, May 13, 2010 at 9:52 PM, And...
   Author: Jeff Zhang, 2010-05-14, 01:51
Re: How to recover hadoop cluster using SecondaryNameNode ? - Hadoop - [mail # user]
...Allen,  Do you mean HDFS-976  and HDFS-966  ?    On Fri, May 14, 2010 at 1:32 AM, Allen Wittenauer  wrote: have undergone any review outside of Facebook. :( &nb...
   Author: Jeff Zhang, 2010-05-14, 01:39
Re: submit multiple jobs simultaneously - Hadoop - [mail # user]
...The returned object of JobClient.submitJob(JobConf job) is RunningJob. You can get the job status through this object.    2010/5/12 Gang Luo :  counters, etc. How can I get th...
   Author: Jeff Zhang, 2010-05-12, 15:46
Re: Questions about SequenceFiles - Hadoop - [mail # user]
...I think this is a bug, writable object should have default no-argument constructor.   On Tue, May 11, 2010 at 7:20 AM, Ananth Sarathy  wrote: om onf); yClass()); ueClass()); ection...
   Author: Jeff Zhang, 2010-05-11, 14:31
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