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[MAPREDUCE-3267] MR2 reduce tasks showing >100% complete - MapReduce - [issue]
...My job is currently showing >100% reduce completion. Some reduce tasks are much higher than 100% complete. they appear to be in the "last merge pass" stage...
http://issues.apache.org/jira/browse/MAPREDUCE-3267    Author: Todd Lipcon, 2013-01-28, 23:03
[MAPREDUCE-4469] Resource calculation in child tasks is CPU-heavy - MapReduce - [issue]
...In doing some benchmarking on a hadoop-1 derived codebase, I noticed that each of the child tasks was doing a ton of syscalls. Upon stracing, I noticed that it's spending a lot of time loopi...
http://issues.apache.org/jira/browse/MAPREDUCE-4469    Author: Todd Lipcon, 2013-01-22, 06:52
Re: Hadoop 1.0.4 Performance Problem - MapReduce - [mail # user]
...Hi Jon,  FYI, this issue in the fair scheduler was fixed by https://issues.apache.org/jira/browse/MAPREDUCE-2905 for 1.1.0. Though it is present again in MR2: https://issues.apache.org/...
   Author: Todd Lipcon, 2012-12-21, 01:06
[MAPREDUCE-4221] Remove jquery theming support - MapReduce - [issue]
...As of today we have 9.4MB of JQuery themes in our code tree. In addition to being a waste of space, it's a highly questionable feature. I've never heard anyone complain that the Hadoop inter...
http://issues.apache.org/jira/browse/MAPREDUCE-4221    Author: Todd Lipcon, 2012-11-13, 20:44
Re: About connection to NameNode in NameNode-HA - MapReduce - [mail # user]
...Hi Yamashita,  Yes, the order in which the nodes are tried is indeed the order in which your nodes are listed in the configuration.  We currently do write StandybException into the...
   Author: Todd Lipcon, 2012-11-01, 16:43
[expand - 1 more] - Re: DataNodes fail to send heartbeat to HA-enabled NameNode - MapReduce - [mail # user]
...BTW, I forgot that I did file a ticket a while back on a related issue: https://issues.apache.org/jira/browse/hdfs-2882  My assumption is that, higher up in the logs, you will find an u...
   Author: Todd Lipcon, 2012-10-30, 20:16
[expand - 1 more] - Re: HDFS HA IO Fencing - MapReduce - [mail # user]
...NFS Locks typically last forever if you disconnect abruptly. So they are not sufficient -- your standby wouldn't be able to take over without manual intervention to remove the lock.  If...
   Author: Todd Lipcon, 2012-10-26, 14:37
[MAPREDUCE-486] JobTracker web UI counts COMMIT_PENDING tasks as Running - MapReduce - [issue]
...In jobdetails.jsp, tasks in COMMIT_PENDING state are listed as "Running". I propose creating another column in this table for COMMIT_PENDING tasks, since users find it confusing that a given...
http://issues.apache.org/jira/browse/MAPREDUCE-486    Author: Todd Lipcon, 2012-10-17, 23:30
[MAPREDUCE-2376] test-task-controller fails if run as a userid < 1000 - MapReduce - [issue]
...test-task-controller tries to verify that the task-controller won't run on behalf of users with uid < 1000. This makes the test fail when running in some test environments - eg our hudson...
http://issues.apache.org/jira/browse/MAPREDUCE-2376    Author: Todd Lipcon, 2012-10-17, 22:59
[MAPREDUCE-3394] Add log guard for a debug message in ReduceTask - MapReduce - [issue]
...There's a LOG.debug message in ReduceTask that stringifies a task ID and uses a non-negligible amount of CPU in some cases. We should guard it with isDebugEnabled...
http://issues.apache.org/jira/browse/MAPREDUCE-3394    Author: Todd Lipcon, 2012-10-17, 19:27
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