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[MAPREDUCE-1198] Alternatively schedule different types of tasks in fair share scheduler
...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...
, 2010-08-24, 21:19
[MAPREDUCE-1167] Make ProcfsBasedProcessTree collect rss memory information
...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....
, 2010-08-24, 21:19
[MAPREDUCE-1995] FairScheduler can wait for JobInProgress lock while holding JobTracker lock
...Here is the related code path.JobInProgress.getTaskInProgress() (Locks JobInProgress)LocalityLevel.fromTask()FairScheduler.updateLastMapLocalityLevel()FairScheduler.assignTasks()JobTracker.h...
, 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
...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...
, 2010-06-16, 18:01
[MAPREDUCE-1756] FairScheduler may assign tasks over the TaskTracker limit
...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....
, 2010-05-07, 01:46
[MAPREDUCE-1546] Jobtracker JSP pages should automatically redirect to the corresponding history page if not in memory
...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...
, 2010-05-05, 18:29
[MAPREDUCE-1243] ant compile-test in contrib/streaming fails
...Compile fails. It seems that hdfs-test jar file cannot be found.compile-test: [echo] contrib: streaming [javac] Compiling 44 source files to /...
, 2009-11-26, 06:23
[MAPREDUCE-1129] Assign multiple Map and Reduce tasks in Fairscheduler
...In Hadoop-0.20, the period of heartbeat becomes much longer. Fairscheduler assigns at most one Map and one Reduce task per heartbeat.This makes the cluster become very inefficient. Often tim...
, 2009-11-10, 08:08
[MAPREDUCE-1181] Enforce RSS memory limit in TaskMemoryManagerThread
...TaskMemoryManagerThread will periodically check the rss memory usage of every task. If the memory usage exceeds the specified threshold, the task will be killed. Also if the total rss memory...
, 2009-11-08, 09:03
[MAPREDUCE-1195] Task resource utilization reporting for profiling and scheduling
...We can make TaskTracker reports its usage on CPU, memory, bandwidth to JobTracker. JobTracker can use the information for scheduling tasks and profiling jobs. One way to do this is to first ...
, 2009-11-06, 22:17
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