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[MAPREDUCE-1568] TrackerDistributedCacheManager should clean up cache in a background thread - MapReduce - [issue]
...Right now the TrackerDistributedCacheManager do the clean up with the following code path:TaskRunner.run() -> TrackerDistributedCacheManager.setup() ->TrackerDistributedCacheManager.ge...
http://issues.apache.org/jira/browse/MAPREDUCE-1568    Author: Scott Chen, 2010-08-24, 21:21
[MAPREDUCE-1538] TrackerDistributedCacheManager can fail because the number of subdirectories reaches system limit - MapReduce - [issue]
...TrackerDistributedCacheManager deletes the cached files when the size goes up to a configured number.But there is no such limit for the number of subdirectories. Therefore the number of subd...
http://issues.apache.org/jira/browse/MAPREDUCE-1538    Author: Scott Chen, 2010-08-24, 21:20
[MAPREDUCE-1265] Include tasktracker name in the task attempt error log - MapReduce - [issue]
...When task attempt receive an error, TaskInProgress will log the task attempt id and diagnosis string in the JobTracker log.Ex:2009-xx-xx 23:50:45,994 INFO org.apache.hadoop.mapred.TaskInProg...
http://issues.apache.org/jira/browse/MAPREDUCE-1265    Author: Scott Chen, 2010-08-24, 21:19
[MAPREDUCE-1198] Alternatively schedule different types of tasks in fair share scheduler - MapReduce - [issue]
...Matei has mentioned in MAPREDUCE-961 that the current scheduler will first try to launch map tasks until canLaunthTask() returns false then look for reduce tasks. This might starve reduce ta...
http://issues.apache.org/jira/browse/MAPREDUCE-1198    Author: Scott Chen, 2010-08-24, 21:19
[MAPREDUCE-1167] Make ProcfsBasedProcessTree collect rss memory information - MapReduce - [issue]
...Right now ProcfsBasedProcess collects only virtual memory. We can make it collect rss memory as well.Later we can use rss in TaskMemoryManagerThread to obtain better memory management....
http://issues.apache.org/jira/browse/MAPREDUCE-1167    Author: Scott Chen, 2010-08-24, 21:19
[MAPREDUCE-1995] FairScheduler can wait for JobInProgress lock while holding JobTracker lock - MapReduce - [issue]
...Here is the related code path.JobInProgress.getTaskInProgress() (Locks JobInProgress)LocalityLevel.fromTask()FairScheduler.updateLastMapLocalityLevel()FairScheduler.assignTasks()JobTracker.h...
http://issues.apache.org/jira/browse/MAPREDUCE-1995    Author: Scott Chen, 2010-08-05, 01:59
[MAPREDUCE-1361] In the pools with minimum slots, new job will always receive slots even if the minimum slots limit has been fulfilled - MapReduce - [issue]
...In 0.20, the fair scheduler compares all the jobs based on their running tasks, minimum slots and deficit. If the number of running tasks is less than the number of minimum slots, it will be...
http://issues.apache.org/jira/browse/MAPREDUCE-1361    Author: Scott Chen, 2010-06-16, 18:01
[MAPREDUCE-1756] FairScheduler may assign tasks over the TaskTracker limit - MapReduce - [issue]
...FairScheduler may assign tasks over the TaskTracker limit.The over assigned task will wait on the TaskTracker in the state of UNASSIGNED causing a higher latency....
http://issues.apache.org/jira/browse/MAPREDUCE-1756    Author: Scott Chen, 2010-05-07, 01:46
[MAPREDUCE-1739] Collecting CPU and memory usage for MapReduce jobs - MapReduce - [issue]
...MAPREDUCE-220 collects CPU and memory usage for each task.We can aggregate them to get the information per job. Such information can be used for scheduling, profiling or charging the users b...
http://issues.apache.org/jira/browse/MAPREDUCE-1739    Author: Scott Chen, 2010-05-07, 00:50
[MAPREDUCE-1546] Jobtracker JSP pages should automatically redirect to the corresponding history page if not in memory - MapReduce - [issue]
...MAPREDUCE-1185 redirects jobdetails.jsp to it's corresponding history page.For convenience, we should also redirect the following JSP pages to the corresponding history pages:jobconf.jspjobt...
http://issues.apache.org/jira/browse/MAPREDUCE-1546    Author: Scott Chen, 2010-05-05, 18:29
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