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[MAPREDUCE-1184] mapred.reduce.slowstart.completed.maps is too low by default - MapReduce - [issue]
...By default, this value is set to 5%.  I believe for most real world situations the code isn't efficient enough to be set this low.  This should be higher, probably around the 50% m...
http://issues.apache.org/jira/browse/MAPREDUCE-1184    Author: Allen Wittenauer, 2011-11-02, 17:46
[MAPREDUCE-1206] Need a better answer for "how many reduces?" - MapReduce - [issue]
...http://hadoop.apache.org/common/docs/current/mapred_tutorial.html#Reducer-snip-How Many Reduces?The right number of reduces seems to be 0.95 or 1.75 multiplied by (<no. of nodes> * map...
http://issues.apache.org/jira/browse/MAPREDUCE-1206    Author: Allen Wittenauer, 2011-11-02, 17:46
[MAPREDUCE-1237] Job with no maps or reduces creates graph with XML parsing error - MapReduce - [issue]
...For some reason, a job that had zero maps and zero reduces got submitted.  When looking at the details of this job in the jobtracker ui, the map completion graph was an XML error rather...
http://issues.apache.org/jira/browse/MAPREDUCE-1237    Author: Allen Wittenauer, 2011-11-02, 17:45
[MAPREDUCE-1450] task logs should specify user vs. system death - MapReduce - [issue]
...When looking at task attempt logs, it should specify whether the task was killed by Hadoop or by the user....
http://issues.apache.org/jira/browse/MAPREDUCE-1450    Author: Allen Wittenauer, 2011-11-02, 17:44
[MAPREDUCE-1552] TaskTracker should report which fs during error - MapReduce - [issue]
...We run with ZFS with fs quotas for the mapred spill space to prevent it over-running the HDFS space.  During merge, we some times end up running out of space.  It would be useful i...
http://issues.apache.org/jira/browse/MAPREDUCE-1552    Author: Allen Wittenauer, 2011-11-02, 17:43
[MAPREDUCE-1665] kill and modify should not be the same acl - MapReduce - [issue]
...The permission to kill a job/task should be split out from modification.  There are definitely instances where someone who can kill a job should not be able to modify it.  [Thi...
http://issues.apache.org/jira/browse/MAPREDUCE-1665    Author: Allen Wittenauer, 2011-11-02, 17:42
[MAPREDUCE-1679] capacity scheduler's user-limit documentation is not helpful - MapReduce - [issue]
...The example given for the user limit tunable doesn't actually show how that value comes into play.  With 4 users, the Max() is 25 for both the user limit and the capacity limit (from my...
http://issues.apache.org/jira/browse/MAPREDUCE-1679    Author: Allen Wittenauer, 2011-11-02, 17:42
[MAPREDUCE-1755] Zombie tasks kept alive by logging system - MapReduce - [issue]
...I'm currently looking at a task that, as far as the task tracker is concerned, is dead.  Like long long long ago dead.  It was a failed task that ran out of heap.  Rather than...
http://issues.apache.org/jira/browse/MAPREDUCE-1755    Author: Allen Wittenauer, 2011-11-02, 17:41
[MAPREDUCE-1815] Directory in logs/history causes ArrayIndexOutOfBoundsException - MapReduce - [issue]
...Creating a directory in the jobtracker history directory causes an ArrayIndexOutOfBounds exception....
http://issues.apache.org/jira/browse/MAPREDUCE-1815    Author: Allen Wittenauer, 2011-11-02, 17:40
[MAPREDUCE-1847] capacity scheduler job tasks summaries are wrong if nodes fail - MapReduce - [issue]
...The Job Scheduling Information the web UI is needs to be re-computed in case nodes fail.  Otherwise it will report tasks are running that are not....
http://issues.apache.org/jira/browse/MAPREDUCE-1847    Author: Allen Wittenauer, 2011-11-02, 17:40
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