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Re: map/reduce job conf settings ignored? (bug?) - Hadoop - [mail # user]
...Also note that the property may have been set up as "final" meaning you  can't override it (without reconfiguring the cluster).  I had a problem  like this.  On Mar 4, 20...
   Author: Keith Wiley, 2011-03-04, 16:47
Re: Speculative execution - Hadoop - [mail # user]
...On Mar 3, 2011, at 3:29 PM, Jacob R Rideout wrote:  wrote: should find the route cause, which is often some race condition or  hardware fault. If it's the same server ever time, tu...
3 emails [+ more]    Author: Keith Wiley, 2011-03-03, 23:52
Streaming cmd-line args? - Hadoop - [mail # user]
...All-Java Hadoop programs can receive command-line arguments to the  driver program simply listing options at run time that aren't prepended  with a recognized Hadoop flag (-file or...
   Author: Keith Wiley, 2011-02-15, 17:41
Re: Multiple various streaming questions - Hadoop - [mail # user]
...On Feb 7, 2011, at 13:39 , Allen Wittenauer wrote:   [On the topic of why I care if Hadoop funnels and queues multiple input  splits into a a small number mappers instead of perfec...
4 emails [+ more]    Author: Keith Wiley, 2011-02-07, 23:39
Override automatica final streaming job status message? - Hadoop - [mail # user]
...Streaming tasks seem to get a final status message from Hadoop itself  (not my code) that reports "R/W", presumably the number of records read  and written (the number of lines of ...
   Author: Keith Wiley, 2011-02-04, 22:49
Re: Streaming data locality - Hadoop - [mail # user]
...On Feb 3, 2011, at 6:25 PM, Allen Wittenauer wrote:  doing.  -cache is used for sending files with your job and should have  no bearing on what your input is to your job. &nbs...
5 emails [+ more]    Author: Keith Wiley, 2011-02-04, 07:03
Managing stdout in streaming - Hadoop - [mail # user]
...So streaming uses stdout to organize the mapper/reducer output, one  record per line with each key/val split at the first TAB.  (Presumably multiple TABS are permitted and become e...
   Author: Keith Wiley, 2011-02-01, 20:55
Re: Streaming reporter counter update - Hadoop - [mail # user]
...Ah, so count doesn't "set" the count, it increments it, meaning I  shouldn't increment it each time.  That would result in some sort of  strange exponential counter.  I s...
2 emails [+ more]    Author: Keith Wiley, 2011-02-01, 20:47
Streaming with user-defined Java driver - Hadoop - [mail # user]
...I would like to use streaming for the mapper and reducer but in such a  way that I still get to do the usual Hadoop setup in Java, the usual  Java arrangement, like this:  pub...
   Author: Keith Wiley, 2011-01-29, 21:14
Sending cachefiles back from streaming interface - Hadoop - [mail # user]
...Looks like I can use -cacheFile or DistributedCache.addCacheFile() to  send read-only files (on HDFS) to mappers and reducers.  This is  particularly useful for streaming mapp...
   Author: Keith Wiley, 2011-01-29, 18:33
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