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Re: Different ways of configuring the memory to the TaskTracker child process (Mapper and Reduce Tasks) - MapReduce - [mail # user]
...Praveen,  The mapred.job.map.memory.mb is a config that Hadoop uses to decided if you r task is using too much memory and needs to be killed.  The memory used by  this include...
   Author: Robert Evans, 2011-11-08, 16:18
[expand - 2 more] - Re: Map Rask has IO exception - MapReduce - [mail # user]
...I really don't know if there is any more I can do over email.  You might wa nt to look at the metrics to see if anything out of the ordinary is happeni ng on these nodes just before or ...
   Author: Robert Evans, 2011-11-07, 20:29
Re: On the relationship between MultithreadedMapper and tasks - MapReduce - [mail # user]
...What you are doing is commonly called a map/side join.  You can often impro ve your performance by increasing the replication count for the smaller fil es, 10 is usually a good number, ...
   Author: Robert Evans, 2011-11-07, 16:26
Re: Keeping intermediate results - MapReduce - [mail # user]
...So you are processing a graph looking for a specific node with a given valu e.  The special key is about all I can think of or if you don't need the re st of the graph you can look at j...
   Author: Robert Evans, 2011-11-07, 16:18
Re: Never ending reduce jobs, error Error reading task outputConnection refused - MapReduce - [mail # user]
...I am not sure what is causing this, but yes they are related.  In hadoop th e map output is served to the reducers through jetty, which is an imbedded  web server.  If the red...
   Author: Robert Evans, 2011-11-04, 15:39
Re: Start Nodemanager with webapp disabled. - MapReduce - [mail # dev]
...The simplest way is to use ephemeral ports.  Set the port number to 0 in th e config and the node manager will pick a free port to listen on.  It will  then heartbeat back int...
   Author: Robert Evans, 2011-10-05, 14:38
[expand - 1 more] - Re: modify a specific TaskTracker's Map slots on the fly - FairScheduler? - MapReduce - [mail # user]
...Ben,  I am not completely sure how it all works, but mapred.heartbeats.in.second  is the config.  It controls how many heartbeats the JT will be able to proc ess in a second f...
   Author: Robert Evans, 2011-09-29, 16:50
Re: Lost task tracker reschedules all tasktracker's successful map tasks - MapReduce - [mail # user]
...If a TaskTracker is lost then it cannot serve up any Map results to Reducer s that will need them so the Map tasks have to be rerun.  I am not sure if  this is the behavior you are...
   Author: Robert Evans, 2011-09-29, 16:46
Re: How to send objects to map task? - MapReduce - [mail # user]
...Pig does serialize some classes out to the jobConf (I believe that it is a  writeable with base64 encoding to turn the bytes into chars).  This has bee n problematic in the past be...
   Author: Robert Evans, 2011-09-28, 15:03
Re: Regarding 'branch-0.20-security' - MapReduce - [mail # dev]
...It is kind of a long history and I will try to leave out all of the politic s involved to make it shorter.  For a long time 0.20 has been the stable re lease of Hadoop.  It is supp...
   Author: Robert Evans, 2011-09-28, 14:25
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