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Re: Tez and MapReduce - Hadoop - [mail # user]
...e.g. in hive to switch enginesset hive.execution.engine=mr;orset hive.execution.engine=tez;tez is faster especially on complex queries.On Aug 31, 2014 10:33 PM, "Adaryl "Bob" Wakefield, MBA"...
   Author: Alexander Pivovarov, 2014-09-01, 16:44
[expand - 1 more] - Re: How to serialize very large object in Hadoop Writable? - Hadoop - [mail # user]
...Usually Hadoop Map Reduce deals with row based data.ReduceContextif you need to write a lot to hdfs file you can get OutputStream to hdfsfile and write bytes.On Fri, Aug 22, 2014 at 3:30 PM,...
   Author: Alexander Pivovarov, 2014-08-22, 23:01
Re: Setting Up First Hadoop / Yarn Cluster - Hadoop - [mail # user]
...Probably permission issue.On Thu, Jul 31, 2014 at 11:32 AM, Houston King wrote: ...
   Author: Alexander Pivovarov, 2014-07-31, 21:40
Re: Best Linux version for hadoop development - Hadoop - [mail # dev]
...I recommend CentOS 6.5 64-bitUI on Ubunty is slow.  CentOS uses old good Gnome 2.28.2I switched from Ubuntu to CentOS a year ago. Everything working fine. Ilike yum. Never had problem w...
   Author: Alexander Pivovarov, 2014-06-13, 18:51
[expand - 1 more] - Re: Which hardware to choose - Hadoop - [mail # user]
...All configs are per node. No HBase, only Hive and Pig installed  On Tue, Oct 2, 2012 at 9:40 PM, Michael Segel wrote:  ...
   Author: Alexander Pivovarov, 2012-10-03, 03:42
Re: More cores Vs More Nodes ? - Hadoop - [mail # user]
...more nodes means more IO on read on mapper step If you use combiners you might need to send only small amount of data over network to reducers  Alexander   On Tue, Dec 13, 2011 at ...
   Author: Alexander Pivovarov, 2011-12-13, 17:58
What's the diff btw setOutputKeyComparatorClass and setOutputValueGroupingComparator? - Hadoop - [mail # user]
...I tried to use one or another for secondary sort -- both options work fine  Also I noticed that if I set both of them at the same time then KeyComparatorClass.compare(O1, O2) never call...
   Author: Alexander Pivovarov, 2011-11-27, 05:13
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