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Re: How Jobtracler stores tasktracker's information - Hadoop - [mail # dev]
...I am not completely sure what you mean by this.  In Hadoop the TaskTracker  will heartbeat into the JobTracker to report its status and get new tasks t o launch.  The Schedule...
   Author: Robert Evans, 2011-12-13, 15:23
Re: Best ways to look-up information? - Hadoop - [mail # user]
...Mark,  Are all of the tables used by all of the processes?  Are all of the tables  used all of the time or are some used infrequently?  Does the data in these  looku...
   Author: Robert Evans, 2011-12-12, 18:55
Re: Hadoop - non disk based sorting? - Hadoop - [mail # dev]
...Mingxi,  My understanding was that just like with the maps that when a reducer's in  memory buffer fills up it too will spill to disk as part of the sort.  In f act I think it...
   Author: Robert Evans, 2011-12-01, 16:14
Re: Which branch for my patch? - Hadoop - [mail # dev]
...Niels,  I think that the branch you put it on depends mostly on where you and other s what to see this feature (splittable Gzip) go in.  At a minimum you shoul d target trunk. &nbs...
   Author: Robert Evans, 2011-11-30, 17:06
Re: Passing data files via the distributed cache - Hadoop - [mail # user]
...There is currently no way to delete the data from the cache when you are do ne.  It is garbage collected when the cache starts to fill up (in LRU order  if you are on a newer relea...
   Author: Robert Evans, 2011-11-28, 16:34
Re: Parallel mapred jobs in Yarn - Hadoop - [mail # dev]
...The configuration options are somewhat different for yarn, then they are fo r MRV1.  You probably want to generate the documentation for yarn  mvn site  And then read through ...
   Author: Robert Evans, 2011-11-09, 15:41
Re: mapred.map.tasks getting set, but not sure where - Hadoop - [mail # user]
...It seems logical too that launching 4000 map tasks on a 20 node cluster is  going to have a lot of overhead with it.  20 does not seem like the ideal n umber, but I don't really kn...
   Author: Robert Evans, 2011-11-07, 16:30
Re: Is it possible to run multiple MapReduce against the same HDFS? - Hadoop - [mail # user]
...I am not positive how all of that works and I may get some of this wrong, b ut I believe that the map reduce user has special privileges in relation to  HDFS that allows it to become an...
   Author: Robert Evans, 2011-10-11, 19:22
Re: Viewing hadoop mapper output - Hadoop - [mail # dev]
...The difference in the command is where the shell script is coming from.  If  you are using ~/mapper.sh then it will look in your home directory to run  the script.  If yo...
   Author: Robert Evans, 2011-10-07, 15:01
Re: Welcoming Eric Yang as a Hadoop Committer - Hadoop - [mail # general]
...Congratulations Eric.   On 10/4/11 3:51 PM, "Devaraj Das"  wrote:  On behalf of the Hadoop PMC, I am pleased to announce that Eric Yang has be en elected a committer in the Ap...
   Author: Robert Evans, 2011-10-05, 14:45
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