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[MAPREDUCE-1187] mradmin -refreshNodes should be implemented - MapReduce - [issue]
...dfsadmin -refreshNodes re-reads the include/exclude files for the HDFS, triggers decommisions, etc.  The MapReduce framework should have similar functionality using the same parameter t...
http://issues.apache.org/jira/browse/MAPREDUCE-1187    Author: Allen Wittenauer, 2011-11-03, 16:54
[MAPREDUCE-3334] TaskRunner should log its activities - MapReduce - [issue]
...TaskRunner has little to no information that it logs, making it impossible to debug when something goes wrong....
http://issues.apache.org/jira/browse/MAPREDUCE-3334    Author: Allen Wittenauer, 2011-11-02, 19:03
[MAPREDUCE-991] HadoopPipes.cc doesn't compile cleanly with SunStudio - MapReduce - [issue]
...Attempting to compile HadoopPipes.cc throws the following warnings and errors:     [exec] "/export/home/awittena/src/hadoop-0.20.0/src/c++/pipes/impl/HadoopPipes.cc", line 663...
http://issues.apache.org/jira/browse/MAPREDUCE-991    Author: Allen Wittenauer, 2011-11-02, 17:49
[MAPREDUCE-1058] analysehistory.jsp should report node where task ran - MapReduce - [issue]
...It is kind of painful to determine which nodes which tasks ran on.  It would be useful to list this in the web ui, especially for the best/worse performing tasks.   Using that info...
http://issues.apache.org/jira/browse/MAPREDUCE-1058    Author: Allen Wittenauer, 2011-11-02, 17:49
[MAPREDUCE-1162] Job history should keep track of which task trackers were blacklisted - MapReduce - [issue]
...It would be useful to have job history keep track of which nodes were blacklisted by the job.  This would be used to build a history of job failure on certain nodes....
http://issues.apache.org/jira/browse/MAPREDUCE-1162    Author: Allen Wittenauer, 2011-11-02, 17:48
[MAPREDUCE-1166] SerialUtils.cc: dynamic allocation of arrays based on runtime variable is not portable - MapReduce - [issue]
...In SerialUtils.cc, the following code appears:    int len;    if (b < -120) {      negative = true;      len = -120 -...
http://issues.apache.org/jira/browse/MAPREDUCE-1166    Author: Allen Wittenauer, 2011-11-02, 17:48
[MAPREDUCE-1180] Detailed area chart of map/reduce slots usage - MapReduce - [issue]
...People are always looking for ideas of things to implement... so here's one. I'd like an app that I can throw at a JobHistory directory that would show me detailed slot usage by job, user, p...
http://issues.apache.org/jira/browse/MAPREDUCE-1180    Author: Allen Wittenauer, 2011-11-02, 17:47
[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
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