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[MAPREDUCE-782] Use PureJavaCrc32 in mapreduce spills - MapReduce - [issue]
...HADOOP-6148 implemented a Pure Java implementation of CRC32 which performs better than the built-in one. This issue is to make use of it in the mapred package...    Author: Todd Lipcon , 2012-09-25, 18:00
[MAPREDUCE-2704] CombineFileInputFormat only works when paths are on the default filesystem - MapReduce - [issue]
...CombineFileInputFormat constructs new Path objects by converting an existing path to a URI, and then only pulling out the "path" part of it. This drops the scheme and host, which makes Combi...    Author: Todd Lipcon , 2012-09-19, 19:28
HDFS - MapReduce - [mail # user]
...Hi LiuLei,  Since you're using CDH3 (a 1.x derived distribution) you are using the old checksum implementations written in Java.  In Hadoop 2.0 (or CDH4), we have JNI-based checksu...
   Author: Todd Lipcon , 2012-09-17, 21:36
[MAPREDUCE-2855] ResourceBundle lookup during counter name resolution takes a lot of time - MapReduce - [issue]
...Loading a job status page in trunk takes a lot of time, and it seems like most of the time is spent resolving counter names. Looking through the JDK source, ResourceBundle.getBundle(String) ...    Author: Todd Lipcon , 2012-08-18, 19:22
[MAPREDUCE-2565] TestMRCLI still failing on trunk - MapReduce - [issue]
...I imagine this is related to the recent shell commands. Here is an example failed test:    Author: Todd Lipcon , 2012-07-10, 21:27
[MAPREDUCE-2251] Remove mapreduce.job.userhistorylocation config - MapReduce - [issue]
...Best I can tell, this config parameter is no longer used as of MAPREDUCE-157 but still exists in the code and in mapred-default.xml. We should remove it to avoid user confusion....    Author: Todd Lipcon , 2012-07-08, 16:18
PreCommit-Admin not running - MapReduce - [mail # dev]
...I reported it to builds@ earlier this week, seems to be running sporadically now.  We had some of our build slaves dead due to the leap second bug. I did the "date" trick to try to fix ...
   Author: Todd Lipcon , 2012-07-04, 23:00
[MAPREDUCE-2224] Synchronization bugs in JvmManager - MapReduce - [issue]
...JvmManager.JvmManagerForType has several HashMap members that are inconsistently synchronized. I've seen sporadic NPEs in the 0.20 version of this code which has similar bugs....    Author: Todd Lipcon , 2012-06-05, 07:25
[MAPREDUCE-4103] Fix HA docs for changes to shell command fencer args - MapReduce - [issue]
...HADOOP-8007 changes the way in which shell command fencers are invoked. For whatever reason, the docs live in the MR tree. This JIRA is to update the docs....    Author: Todd Lipcon , 2012-05-23, 20:28
Review Request. - MapReduce - [mail # dev]
...Hi Bhallamudi,  I committed MAPREDUCE-4002. MAPREDUCE-4071 has many test failures in the most recent QA run.  I looked at the other two but I think another committer who spends mor...
   Author: Todd Lipcon , 2012-05-20, 07:48