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[MAPREDUCE-5692] Add explicit diagnostics when a task attempt is killed due to speculative execution - MapReduce - [issue]
...We need to clearly indicate when a task attempt is killed because another task attempt succeeded first when speculative execution is enabled....
http://issues.apache.org/jira/browse/MAPREDUCE-5692    Author: Gera Shegalov, 2014-01-28, 23:33
[MAPREDUCE-5650] Job fails when hprof mapreduce.task.profile.map/reduce.params is specified - MapReduce - [issue]
...When one uses dedicated hprof mapreduce.task.profile.map.params or mapreduce.task.profile.reduce.params, the profiled tasks will fail to launch because hprof parameters are supplied to the c...
http://issues.apache.org/jira/browse/MAPREDUCE-5650    Author: Gera Shegalov, 2014-01-18, 13:27
[MAPREDUCE-5696] Add Localization counters to MR - MapReduce - [issue]
...Users are often unaware of localization cost that their jobs incur. To measure effectiveness of localization caches it is necessary to expose the overhead in the form of user-visible metrics...
http://issues.apache.org/jira/browse/MAPREDUCE-5696    Author: Gera Shegalov, 2014-01-03, 03:53
[MAPREDUCE-5613] DefaultSpeculator holds and checks hashmap that is always empty - MapReduce - [issue]
...The only way pendingSpeculations is used:     // If the task is already known to be speculation-bait, don't do anything         if (pendingSpeculation...
http://issues.apache.org/jira/browse/MAPREDUCE-5613    Author: Gera Shegalov, 2013-11-13, 13:47
[MAPREDUCE-5150] Backport 2009 terasort (MAPREDUCE-639) to branch-1 - MapReduce - [issue]
...Users evaluate performance of Hadoop clusters using different benchmarks such as TeraSort. However, terasort version in branch-1 is outdated. It works on teragen dataset that cannot exceed 4...
http://issues.apache.org/jira/browse/MAPREDUCE-5150    Author: Gera Shegalov, 2013-06-01, 00:21
[MAPREDUCE-4986] Document the locality effect of preemption timeouts in FairScheduler when mapred.fairscheduler.preemption is off - MapReduce - [issue]
...fair_scheduler.xml does not mention the delay scheduling algorithm. Furthermore, it does not explain that in getAllowedLocalityLevel the preemption timeouts are used to disable the locality ...
http://issues.apache.org/jira/browse/MAPREDUCE-4986    Author: Gera Shegalov, 2013-02-07, 00:30
[MAPREDUCE-4844] Counters.java doesn't obey Java Memory Model - MapReduce - [issue]
...Counters have a number of immutable fields that have not been declared 'final'.For example, the field groups is not final. It is, however, accessed in a couple of methods that are declared '...
http://issues.apache.org/jira/browse/MAPREDUCE-4844    Author: Gera Shegalov, 2012-12-04, 23:24
[MAPREDUCE-4195] With invalid queueName request param, jobqueue_details.jsp shows NPE - MapReduce - [issue]
...When you access /jobqueue_details.jsp manually, instead of via a link, it has queueName set to null internally and this goes for a lookup into the scheduling info maps as well.As a result, i...
http://issues.apache.org/jira/browse/MAPREDUCE-4195    Author: Gera Shegalov, 2012-09-12, 03:30
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