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Re: Copy Vs DistCP - MapReduce - [mail # user]
...Yes makes sense...  cp is serialized and simpler, and does not rely on jobtracker- Whereas distcp actually only submits a job and waits for completion.   So it can fail if tasks st...
   Author: Jay Vyas, 2013-04-11, 12:44
Mapreduce migration to mvn ? - MapReduce - [mail # dev]
...Hi guys :  Seems like it would be simpler if the existing mapreduce repo had a pom.xml for building, rather than build.xml.  Could there be a JIRA made to this effect?  Jay Vy...
   Author: Jay Vyas, 2013-04-10, 00:02
The Job.xml file - MapReduce - [mail # user]
...Hi guys: I cant find much info about the life cycle for the job.xml file in hadoop.  My thoughts are :  1) It is created by the job client 2) It is only read by the JobTracker 3) T...
   Author: Jay Vyas, 2013-04-09, 16:25
Re: Distributed cache: how big is too big? - MapReduce - [mail # user]
...Hmmm.. maybe im missing something.. but (@bjorn) Why would you use hdfs as a replacement for the distributed cache?  After all - the distributed cache is just a file with replication ov...
   Author: Jay Vyas, 2013-04-09, 14:56
Specific HDFS tasks where is passwordless SSH is necessary - MapReduce - [mail # user]
...When setting up passwordless ssh on a cluster, its clear that the namenode needs to be able to ssh into task trackers to start/stop nodes and restart the cluster.  What else is password...
   Author: Jay Vyas, 2013-02-05, 23:06
Re: core-site.xml file is being ignored by new Configuration() - MapReduce - [mail # user]
...no difference.  This is really odd.  The only way I can get it to work is by the following:   /**  * A simple test harness for glusterfs  * @author jvyas  */ pu...
   Author: Jay Vyas, 2013-01-17, 05:01
datanode write forwarding - MapReduce - [mail # user]
...Hi :  Do data nodes, when they receive write requests, forward the request to the next datanode in the chain after appending to a file? Or rather, do the write and forward asynchronousl...
   Author: Jay Vyas, 2012-12-18, 20:56
JobTracker scheduling when there is no locality optimization. - MapReduce - [mail # user]
...How does the JobTracker schedule / assign tasks to open TaskTrackers when there is no locality constraints (i.e. when some non file input format, such as DBInputFormat is used).... Is it ran...
   Author: Jay Vyas, 2012-12-07, 22:09
hadoop task assigner - MapReduce - [mail # user]
...Hi : Where are the hooks in hadoop for the implementation of locality?  I assume that Mappers are blind to locality - they read directly via their Context objects, whatever splits they ...
   Author: Jay Vyas, 2012-12-07, 16:28
Re: DFS and the RecordReader - MapReduce - [mail # user]
...Hmm... so when a record reader calls fs.open(...) , I guess Im looking for an example of how the input stream is created... ?...
   Author: Jay Vyas, 2012-12-06, 22:47
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