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Re: Connect to Hadoop Cluster from external client - Hadoop - [mail # user]
...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...
   Author: Jeff Zhang, 2010-06-25, 06:10
Re: Newb question on HDFS - Hadoop - [mail # user]
...change localhost.com to localhost  On Thu, Jun 24, 2010 at 12:11 PM, Blargy  wrote: son  my me and authority  at. en the file is stion-on-HDFS-tp918683p918683.html  ...
   Author: Jeff Zhang, 2010-06-24, 04:52
Re: Questions about recommendation value of the "io.sort.mb" parameter - Hadoop - [mail # dev]
...Hi 李钰  The size of map output depends on your Mapper class. The Mapper class will do processing on the input data.    2010/6/23 李钰 : e �Srigurunath Chakravarthi 写道� � arge job...
   Author: Jeff Zhang, 2010-06-23, 10:08
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
[expand - 3 more] - 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
[expand - 1 more] - 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
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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