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RE: What happens to blacklisted TaskTrackers? - MapReduce - [mail # user]
...Hi Pedro,    1. If the Tast Tracker doesn't send heart beat for some time(i.e expiry interval), the the task tracker will be declared as lost tracker and not black listed task trac...
   Author: Devaraj k, 2012-04-26, 10:37
RE: How to get the HDFS I/O information - MapReduce - [mail # user]
...Hi Qu,       You can access the HDFS read/write bytes for each task or job level using the below counters.  FileSystemCounters :  HDFS_BYTES_READ      ...
   Author: Devaraj k, 2012-04-25, 06:31
[expand - 1 more] - RE: Unable to build hadoop-mapreduce-project - MapReduce - [mail # dev]
...Hi Apurv,  I am sorry for my misinterpretation and wrong reply.  Thanks for sharing this.  Thanks Devaraj  ________________________________________ From: Apurv Verma [[EM...
   Author: Devaraj k, 2012-04-19, 05:26
RE: ResourceCalculatorPlugin.getCpuUsage - MapReduce - [mail # dev]
...It should return 100.0 for fully utilized machine.  Thanks Devaraj  ________________________________________ From: Radim Kolar [[EMAIL PROTECTED]] Sent: Tuesday, April 17, 2012 7:5...
   Author: Devaraj k, 2012-04-17, 15:32
[expand - 1 more] - RE: Reducer not firing - MapReduce - [mail # user]
...Can you check the task attempt logs in your cluster and find out what is happening in the reduce phase. By default task attempt logs present in $HADOOP_LOG_DIR/userlogs//. There could be som...
   Author: Devaraj k, 2012-04-17, 09:30
RE: CompressionCodec in MapReduce - MapReduce - [mail # user]
...Hi Grzegorz,      You can find the below properties for Job input and output compression:  The below prop is used by the codec factory. This codec will be taken based on ...
   Author: Devaraj k, 2012-04-11, 08:37
RE: Calling one MR job within another MR job - MapReduce - [mail # user]
...Hi Stuti,  If you want deal with different types of files in the map phase, you can us e org.apache.hadoop.mapred.lib.MultipleInputs API(different input formats,  mappers) and then...
   Author: Devaraj k, 2012-04-04, 12:39
RE: Accessing local filesystem with org.apache.hadoop.fs.FileSystem - MapReduce - [mail # user]
...Please try like this to access the local file system.  FileSystem fileSystem = FileSystem.getLocal(conf); FSDataInputStream i = fileSystem.open(p);   Thanks Devaraj _______________...
   Author: Devaraj k, 2012-04-04, 12:25
[expand - 1 more] - RE: Including third party jar files in Map Reduce job - MapReduce - [mail # user]
...As Bejoy mentioned,  If you have copied the jar to $HADOOP_HOME, then you should copy it to all the nodes in the cluster. (or)  If you want to make use of -libjar option, your appl...
   Author: Devaraj k, 2012-04-04, 08:38
RE: Debug MR tasks impossible. - MapReduce - [mail # user]
...Hi Pedro,      You can use the below property to pass the debug params to the child jvm. And also you should make sure that have only one task running at a time by giving the ...
   Author: Devaraj k, 2012-03-29, 16:11
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