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Re: question about preserving data locality in MapReduce with Yarn - MapReduce - [mail # user]
...How do you know where the data exists when you begin?  Sent from a remote device. Please excuse any typos...  Mike Segel  ...
   Author: Michael Segel, 2013-10-29, 02:03
Re: Multidata center support - MapReduce - [mail # user]
...Sorry, its a poor idea period.   Its one thing for something like Cleversafe to span a data center, but you're also having unit of work in terms of map/reduce.   Think about all of...
   Author: Michael Segel, 2013-09-05, 01:15
Re: Does libhdfs c/c++ api support read/write compressed file - MapReduce - [mail # user]
...Silly question... then what's meant by the native libraries when you talk about compression?   On Jun 3, 2013, at 5:27 AM, Harsh J  wrote:  ...
   Author: Michael Segel, 2013-06-03, 14:04
Re: Reading json format input - MapReduce - [mail # user]
...You have the entire string.  If you tokenize on commas ...   Starting with :  You end up with  {"author":"foo",    and "text":"hello"}  So you can ignore t...
   Author: Michael Segel, 2013-05-30, 02:52
[expand - 2 more] - Re: Question about Name Spaces… - MapReduce - [mail # user]
...Harsh,   IMHO, I don't see the need of doing any sort of links over name spaces or containers.  If you want to have data that spans containers, you copy the data to the container, ...
   Author: Michael Segel, 2013-05-16, 12:47
Hardlinkes (See HDFS-3370)  wuz  Re: Question about Name Spaces… - MapReduce - [mail # user]
...Ok, that's what I thought.  So here's my real question...  I'm looking at HDFS-3370 (see: https://issues.apache.org/jira/browse/HDFS-3370 )  There is some talk about one of th...
   Author: Michael Segel, 2013-05-15, 16:57
Re: Benefits of Hadoop Distributed Cache - MapReduce - [mail # user]
...Not sure what you mean...  If you want to put up a small file to be used by each Task in your job (mapper or reducer)... you could put it up on HDFS.   Or if you're launching your ...
   Author: Michael Segel, 2013-05-07, 22:48
[expand - 1 more] - Re: Hardware Selection for Hadoop - MapReduce - [mail # user]
...I wouldn't.  You end up with a 'Frankencluster' which could become problematic down the road.   Ever try to debug a port failure on a switch? (It does happen and its a bitch.) &nbs...
   Author: Michael Segel, 2013-05-07, 12:53
Re: OutOfMemory during Plain Java MapReduce - MapReduce - [mail # user]
..."A potential problem could be, that a reduce is going to write files >600MB and our mapred.child.java.opts is set to ~380MB."  Isn't the minimum heap normally 512MB?   Why not j...
   Author: Michael Segel, 2013-03-08, 14:39
Re: Is there a way to keep all intermediate files there after the MapReduce Job run? - MapReduce - [mail # user]
...Your job.xml file is kept for a set period of time.  I believe the others are automatically removed.   You can easily access the job.xml file from the JT webpage.  On Mar 1, 2...
   Author: Michael Segel, 2013-03-01, 13:23
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