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[MAPREDUCE-1683] Remove JNI calls from ClusterStatus cstr - MapReduce - [issue]
...The ClusterStatus constructor makes two JNI calls to the Runtime to fetch memory information. ClusterStatus instances are often created inside the JobTracker to obtain other, unrelated metri...
http://issues.apache.org/jira/browse/MAPREDUCE-1683    Author: Chris Douglas, 2011-12-12, 06:18
[MAPREDUCE-1376] Support for varied user submission in Gridmix - MapReduce - [issue]
...Gridmix currently submits all synthetic jobs as the client user. It should be possible to map users in the trace to a set of users appropriate for the target cluster....
http://issues.apache.org/jira/browse/MAPREDUCE-1376    Author: Chris Douglas, 2011-12-12, 06:18
Re: Yarn NodeManager services - MapReduce - [mail # dev]
...On Tue, Oct 11, 2011 at 2:05 PM,   wrote:  A general-purpose transfer protocol for intermediate data was designed and scrapped for time. So was a local service allocated and shared...
   Author: Chris Douglas, 2011-10-11, 21:33
[MAPREDUCE-499] Revert extra debugging - MapReduce - [issue]
...It appears that HADOOP-3647 is actually caused by a bad disk, unobserved given HADOOP-4277. The extra debugging can be removed....
http://issues.apache.org/jira/browse/MAPREDUCE-499    Author: Chris Douglas, 2011-09-18, 22:57
Re: [VOTE] Merge MR-279 to trunk. - MapReduce - [mail # dev]
...+1 -C  On Tue, Aug 16, 2011 at 2:14 PM, Mahadev Konar  wr ote: to trunk. I have uploaded necessary details on https://issues.apache.org/ji ra/browse/MAPREDUCE-279....
   Author: Chris Douglas, 2011-08-18, 00:08
Re: Stupid questions about combiners in ...hadoop.mapreduce - MapReduce - [mail # user]
...On Mon, May 23, 2011 at 11:32 AM, Mike Spreitzer  wrote:  The combiner is responsible for maintaining the sort order (and partitioning) effected prior to that step. So given a reco...
   Author: Chris Douglas, 2011-05-23, 21:22
Re: Mappers crashing due to running out of heap space during initialisation - MapReduce - [mail # user]
...Lower io.sort.mb or raise the heap size for the task. -C  On Tue, Apr 26, 2011 at 10:55 AM, James Hammerton  wrote:...
   Author: Chris Douglas, 2011-04-26, 19:02
Re: what is the difference between the two packages "org.apache.hadoop.mapreduce"and "org.apache.hadoop.mapred"? - MapReduce - [mail # user]
...On Tue, Apr 26, 2011 at 10:56 AM, Marcos Ortiz  wrote:  It supports both APIs. The MapReduce runtime is effectively unchanged. -C...
   Author: Chris Douglas, 2011-04-26, 18:59
[expand - 2 more] - Re: Best practices for jobs with large Map output - MapReduce - [mail # user]
...On Mon, Apr 18, 2011 at 3:42 AM, Shai Erera  wrote:  Without knowing the format of a Lucene index, I can't say whether this approach makes sense. Instead of handling the cleanup yo...
   Author: Chris Douglas, 2011-04-19, 18:47
[expand - 1 more] - Re: Best approach for accessing secondary map task outputs from reduce tasks? - MapReduce - [mail # user]
...On Sun, Feb 13, 2011 at 8:22 PM, Jason  wrote:  As listed in the assumptions, I thought each map emits only one datum that must be read by every reduce. Not one special datum among...
   Author: Chris Douglas, 2011-02-14, 13:43
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