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[expand - 4 more] - Re: rack awarness unexpected behaviour - Hadoop - [mail # user]
...Doing that will balance the block writing but I think here you loose the concept of physical rack awareness. Let's say you have 2 physical racks, one with 2 servers and one with 4. If you ar...
   Author: Marc Sturlese, 2013-10-03, 13:58
[expand - 1 more] - Re: doubt about reduce tasks and block writes - Hadoop - [mail # user]
...Thanks, Raj you got exactly my point. I wanted to confirm this assumption as I was guessing if a shared HDFS cluster with MR and Hbase like this would make sense: http://old.nabble.com/HBase...
   Author: Marc Sturlese, 2012-08-25, 07:05
[expand - 6 more] - Re: LZO exception decompressing (returned -8) - Hadoop - [mail # user]
...Absolutely. In case I don't find the root of the problem soon I'll definitely try it.   View this message in context: http://lucene.472066.n3.nabble.com/LZO-exception-decompressing-retu...
   Author: Marc Sturlese, 2012-03-02, 04:22
multioutput dfs.datanode.max.xcievers and too many open files - Hadoop - [mail # user]
...Hey there, I've been running a cluster for about a year (about 20 machines). I've run many concurrent jobs there and some of them with multiOutput and never had any problem (multiOutputs whe...
   Author: Marc Sturlese, 2012-02-23, 15:26
cross product of 2 data sets - Hadoop - [mail # user]
...Hey there, I would like to do the cross product of two data sets, any of them feeds in memory. I've seen pig has the cross operation. Can someone please explain me how it implements it? &nbs...
   Author: Marc Sturlese, 2011-09-01, 18:44
Re: Why use "Reverse Timestamp" as the Row Key? - Hadoop - [mail # user]
...This is normally useful for lot's of web apps. Sort in Hbase is done at insert time not when scanning. Using a reversed timestamp you ensure the most recent activity of the user will be show...
   Author: Marc Sturlese, 2011-07-22, 09:08
check namenode, jobtracker, datanodes and tasktracker status - Hadoop - [mail # user]
...Hey there, I've written some scripts to check dfs disk space, number of datanodes, number of tasktrackers, heap in use... I'm with hadoop 0.20.2 and to do that I use the DFSClient and JobCli...
   Author: Marc Sturlese, 2011-07-08, 17:49
Re: lucene with hbase. - Hadoop - [mail # user]
...There's a lot of work going on integrating lucene search into hbase. Maybe you find this interesting: https://issues.apache.org/jira/browse/HBASE-3529  View this message in context: htt...
   Author: Marc Sturlese, 2011-06-20, 13:35
Good practices using a jar with hadoop jobs - Hadoop - [mail # user]
...Let's say I have a /home/me/foo.jar which contains a main that runs a hadoop job and once it get completed launches another job (a pipeline of a couple of jobs). The jar contains all the had...
   Author: Marc Sturlese, 2011-06-20, 11:25
So many unexpected "Lost task tracker" errors making the job to be killed Options - Hadoop - [mail # user]
...Hey there, I have a small cluster running on 0.20.2. Everything is  fine but once in a while, when a job with a lot of map tasks is  running I start getting the error:  Lost t...
   Author: Marc Sturlese, 2011-05-09, 08:30
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