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[expand - 1 more] - Re: How does hadoop decide how many reducers to run? - MapReduce - [mail # user]
...Since you are using EMR,  AWS pre configures the number of slots per node.  So you are already getting the optimum number of slots that their 'machines' can handle.   So when ...
   Author: Michael Segel, 2013-01-12, 14:05
Re: What is the preferred way to pass a small number of configuration parameters to a mapper or reducer - MapReduce - [mail # user]
...Ed,   There are some who are of the opinion that these certifications are worthless.  I tend to disagree, however, I don't think that they are the best way to demonstrate one's abi...
   Author: Michael Segel, 2012-12-30, 16:27
Re: Is it necessary to run secondary namenode when starting HDFS? - MapReduce - [mail # user]
...Hi,   Just a reminder... just because you can do something or rather in this case, not do something, doesn't mean that its a good idea.   The SN is there for a reason. Maybe if you...
   Author: Michael Segel, 2012-12-17, 17:42
Re: Assigning reduce tasks to specific nodes - MapReduce - [mail # user]
...I haven't thought about reducers but in terms of mappers you need to override the data locality so that it thinks that the node where you want to send the data exists.  Again, not reall...
   Author: Michael Segel, 2012-12-01, 17:57
Re: bounce message - MapReduce - [mail # user]
...So how many people here are old enough to remember the song 'Hotel California' ? :-P   On Nov 28, 2012, at 11:18 AM, Ted Dunning  wrote:  ...
   Author: Michael Segel, 2012-11-30, 20:46
Re: Best practice for storage of data that changes - MapReduce - [mail # user]
...Here's the simple thing to consider...   If you are running M/R jobs against the data... HBase hands down is the winner.   If you are looking at a stand alone cluster ... Cassandra...
   Author: Michael Segel, 2012-11-30, 20:44
Re: Hadoop processing - MapReduce - [mail # user]
...To go back to the OP's initial position.  2 new nodes where data hasn't yet been 'balanced'.   First, that's a small window of time.   But to answer your question...   Th...
   Author: Michael Segel, 2012-11-08, 15:03
[expand - 1 more] - Re: Please help on providing correct answers - MapReduce - [mail # user]
...Sorry, I think I had better explain why I am curious...   First, there are a couple of sites that have study questions to help pass Cloudera's certification.  ( I don't know if Hor...
   Author: Michael Segel, 2012-11-07, 18:37
[expand - 1 more] - Re: Question related to Number of Mapper - MapReduce - [mail # user]
...The larger question is how many blocks are required to store a 100MB file if the HDFS block size is 64MB.   If it takes 2 blocks then when you run your job, you will have 1 mapper per b...
   Author: Michael Segel, 2012-11-07, 17:30
[expand - 1 more] - Re: One mapper/reducer runs on a single JVM - MapReduce - [mail # user]
...If you exceed the amount of physical memory available, memory pages will be written to disk in a temp space. The act of 'swapping' the memory pages from memory to disk and back again is know...
   Author: Michael Segel, 2012-11-06, 16:27
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