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Re: Does all reducer take input from all NodeManager/Tasktrackers of Map tasks - Hadoop - [mail # user]
...On Jan 27, 2014, at 4:17 AM, Amit Mittal  wrote:Reducers pull map outputs from all the maps. So JobTracker/AppMaster simply give the completion events of *all* the maps to every reducer...
   Author: Vinod Kumar Vavilapalli, 2014-01-27, 17:16
[expand - 1 more] - Re: Memory problems with BytesWritable and huge binary files - Hadoop - [mail # user]
...Okay. Assuming you don't need a whole file (video) in memory for your processing, you can simply write a Inputformat/RecordReader implementation that streams through any given file and proce...
   Author: Vinod Kumar Vavilapalli, 2014-01-24, 22:43
Re: HDFS data transfer is faster than SCP based transfer? - Hadoop - [mail # user]
...Is it a single file? Lots of files? How big are the files? Is the copy on asingle node or are you running some kind of a MapReduce program?+VinodHortonworks Inc.http://hortonworks.com/On Fri...
   Author: Vinod Kumar Vavilapalli, 2014-01-24, 18:19
[expand - 2 more] - Re: Logistics for releasing 2.4 - Hadoop - [mail # dev]
...Can you please send out a separate note so that others who aren't following this thread also know about the change of direction? And update the RoadMap wiki too?+VinodOn Jan 22, 2014, at 6:0...
   Author: Vinod Kumar Vavilapalli, 2014-01-23, 08:10
Re: kerberos for outside threads - Hadoop - [mail # user]
...That is a very appropriate setup. As long as those assumptions remain valid, of course. This was the only way how early hadoop clusters were secured - by restricting access to the cluster us...
   Author: Vinod Kumar Vavilapalli, 2014-01-22, 18:21
Re: [YARN] TestDistributedShell failed in eclipse but successful in maven - Hadoop - [mail # user]
...Yes. It depends on JAVA_HOME env variable. When you run it, it will succeed if you set that variable up correctly in eclipse test Run configuration.  +Vinod  On Jan 21, 2014, at 5:...
   Author: Vinod Kumar Vavilapalli, 2014-01-22, 18:17
[expand - 1 more] - Re: Container's completion issue - Hadoop - [mail # user]
...Can you paste the trace for this container on the NodeManager? Specifically any exception messages.  +Vinod  On Jan 21, 2014, at 12:00 PM, REYANE OUKPEDJO  wrote:    ...
   Author: Vinod Kumar Vavilapalli, 2014-01-21, 23:21
Re: Pushing sources and Javadoc Maven artifacts for Hadoop releases - Hadoop - [mail # dev]
...Yes, this is very useful! Please file a ticket and put the patch there.  Thanks, +Vinod   On Jan 10, 2014, at 7:55 AM, Lewis John Mcgibbney  wrote:    CONFIDENTIALIT...
   Author: Vinod Kumar Vavilapalli, 2014-01-10, 18:44
Re: A question about Hadoop 1 job user id used for group mapping, which could lead to performance degradatioin - Hadoop - [mail # user]
...It just seems like lazy code. You can see that, later, there is this:  {code}          for(Token token : UserGroupInformation.getCurrentUser().getTokens()) { &n...
   Author: Vinod Kumar Vavilapalli, 2014-01-08, 18:11
Re: Understanding MapReduce source code : Flush operations - Hadoop - [mail # user]
...Assuming your output is going to HDFS, you want to look at DFSClient.  Reducer uses FileSystem to write the output. You need to start looking at how DFSClient chunks the output and send...
   Author: Vinod Kumar Vavilapalli, 2014-01-06, 19:11
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