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[MAPREDUCE-5744] Job hangs because RMContainerAllocator$AssignedRequests.preemptReduce() violates the comparator contract - MapReduce - [issue]
...We ran into a situation where tasks are not getting assigned because RMContainerAllocator$AssignedRequests.preemptReduce() fails repeatedly with the following exception:2014-02-06 16:43:45,1...
http://issues.apache.org/jira/browse/MAPREDUCE-5744    Author: Sangjin Lee, 2014-02-28, 21:35
[MAPREDUCE-5232] log classpath and other key properties on child JVM start - MapReduce - [issue]
...It would be great if we log vital information such as classpath, etc. upon a mapreduce child JVM start. This would help a great deal in terms of troubleshooting classpath issues, etc. Today ...
http://issues.apache.org/jira/browse/MAPREDUCE-5232    Author: Sangjin Lee, 2014-02-19, 02:04
Re: [VOTE] Release Apache Hadoop 2.3.0 - MapReduce - [mail # dev]
...If it's not too late, I'd like to bring your attention to YARN-1692.We get a ConcurrentModificationException with the fair scheduler when itupdates demand, and we saw RM get into a pretty ba...
   Author: Sangjin Lee, 2014-02-12, 19:57
[MAPREDUCE-5186] mapreduce.job.max.split.locations causes some splits created by CombineFileInputFormat to fail - MapReduce - [issue]
...CombineFileInputFormat can easily create splits that can come from many different locations (during the last pass of creating "global" splits). However, we observe that this often runs afoul...
http://issues.apache.org/jira/browse/MAPREDUCE-5186    Author: Sangjin Lee, 2014-01-28, 23:33
branch development for HADOOP-9639 - MapReduce - [mail # dev]
...We have been having discussions on HADOOP-9639 (shared cache for jars) and the proposed design there for some time now. We are going to start work on this and have it vetted and reviewed by ...
   Author: Sangjin Lee, 2013-12-02, 19:47
[MAPREDUCE-5170] incorrect exception message if min node size > min rack size - MapReduce - [issue]
...The exception message for CombineFileInputFormat if min node size > min rack size is worded backwards.Currently it reads "Minimum split size per node... cannot be smaller than the minimum...
http://issues.apache.org/jira/browse/MAPREDUCE-5170    Author: Sangjin Lee, 2013-09-26, 14:29
[expand - 1 more] - Re: [VOTE] Release Apache Hadoop 2.0.4.1-alpha - MapReduce - [mail # dev]
...+1 (non-binding)  Thanks, Sangjin   On Fri, May 24, 2013 at 8:48 PM, Konstantin Boudnik  wrote:  ...
   Author: Sangjin Lee, 2013-05-25, 17:01
[MAPREDUCE-5046] backport MAPREDUCE-1423 to mapred.lib.CombineFileInputFormat - MapReduce - [issue]
...The CombineFileInputFormat class in org.apache.hadoop.mapred.lib (the old API) has a couple of issues. These issues were addressed in the new API (MAPREDUCE-1423), but the old class was not ...
http://issues.apache.org/jira/browse/MAPREDUCE-5046    Author: Sangjin Lee, 2013-05-06, 03:56
[MAPREDUCE-5146] application classloader may be used too early to load classes - MapReduce - [issue]
...At least in the case of YarnChild, the application classloader is set fairly early (both in Configuration and as a TCCL). This has an effect of using the application classloader unexpectedly...
http://issues.apache.org/jira/browse/MAPREDUCE-5146    Author: Sangjin Lee, 2013-04-23, 15:07
[expand - 1 more] - Re: MAPREDUCE-5069 - MapReduce - [mail # dev]
...Thanks for the clarification.  Sangjin   On Mon, Apr 22, 2013 at 11:38 AM, Konstantin Boudnik  wrote:  ...
   Author: Sangjin Lee, 2013-04-22, 18:44
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