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[MAPREDUCE-791] Document Hadoop Map-Reduce Architecture - MapReduce - [issue]
...It would be nice to document the Map-Reduce architecture similar to the HDFS design document: http://hadoop.apache.org/common/docs/current/hdfs_design.html....
http://issues.apache.org/jira/browse/MAPREDUCE-791    Author: Arun C Murthy, 2014-07-23, 21:05
[MAPREDUCE-786] Jobtracker history should be written aysnchronously to the filesystem - MapReduce - [issue]
...Jobtracker lock is held while writing the history events. This makes the jobtracker slow on flushes, especially when history is written to HDFS. History events should be written asynchronous...
http://issues.apache.org/jira/browse/MAPREDUCE-786    Author: Sharad Agarwal, 2014-07-23, 21:04
[MAPREDUCE-774] Java/C++ word count examples have different outputs - MapReduce - [issue]
...I ran the c++ word count example using pipes and got this result:        Alethea 1488        Arneb   1508       &nb...
http://issues.apache.org/jira/browse/MAPREDUCE-774    Author: Hyunjung Park, 2014-07-23, 21:02
[MAPREDUCE-770] org.apache.hadoop.tools.TestCopyFiles may leave junk files when an assertion fails - MapReduce - [issue]
...In most of the testXxxYyyZzz methods, the code runs:   preliminaries   ToolRunner( ..., new String[] { local and DFS filenames and more filenames });   assertMa...
http://issues.apache.org/jira/browse/MAPREDUCE-770    Author: Dick King, 2014-07-23, 21:00
[MAPREDUCE-491] RAgzip: multiple map tasks for a large gzipped file - MapReduce - [issue]
...Currently, the hadoop processes gzipped files with only one map.We have made a patch that enables multiple map tasks for one large gzipped file. We call the patch RAgzip.To process multiple ...
http://issues.apache.org/jira/browse/MAPREDUCE-491    Author: Daehyun Kim, 2014-07-23, 20:53
[MAPREDUCE-763] Capacity scheduler should clean up reservations if it runs tasks on nodes other than where it has made reservations - MapReduce - [issue]
...Currently capacity scheduler makes a reservation on nodes for high memory jobs that cannot currently run at the time. It could happen that in the meantime other tasktrackers become free to r...
http://issues.apache.org/jira/browse/MAPREDUCE-763    Author: Hemanth Yamijala, 2014-07-23, 20:50
[MAPREDUCE-762] Task's process trees may not be killed if a TT is restarted - MapReduce - [issue]
...Some work has been done to make sure the tasktrackers kill process trees of tasks when they finish (either successfully, or with failures or when they are killed). Related JIRAs are HADOOP-2...
http://issues.apache.org/jira/browse/MAPREDUCE-762    Author: Hemanth Yamijala, 2014-07-23, 20:45
[MAPREDUCE-761] Revisit MapRed logging information - MapReduce - [issue]
...We should revisit what information should be logged so that debugging becomes easier....
http://issues.apache.org/jira/browse/MAPREDUCE-761    Author: Amar Kamat, 2014-07-23, 20:33
[MAPREDUCE-759] Refactor localization code in TaskTracker - MapReduce - [issue]
...Localization code in TaskTracker is spread across TaskTracker, TaskTracker.TaskInProgress and TaskRunner. It turns out to be a bit complicated piece of code, as was observed during HADOOP-44...
http://issues.apache.org/jira/browse/MAPREDUCE-759    Author: Vinod Kumar Vavilapalli, 2014-07-23, 20:31
[MAPREDUCE-758] JobInProgressListener events might be garbled - MapReduce - [issue]
...Consider the following scenario EagerTaskInitializer calls jobtracker.initJob(obj1) initJob will snapshot the job run-state to PREP Before initJob() issues job1.initTask(), user issues a ki...
http://issues.apache.org/jira/browse/MAPREDUCE-758    Author: Amar Kamat, 2014-07-23, 20:31
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