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[MAPREDUCE-4229] Counter names' memory usage can be decreased by interning - MapReduce - [issue]
...In our experience, most of the memory in production JTs goes to storing counter names (String objects and character arrays). Since most counter names are reused again and again, it would be ...
http://issues.apache.org/jira/browse/MAPREDUCE-4229    Author: Todd Lipcon, 2013-02-06, 17:05
Re: HyperThreading in TaskTracker nodes? - MapReduce - [mail # user]
...Power issues aside, I've seen similar sorts of performance gains for MR workloads - around 15-20%.  I think a fair bit of it is due to poor CPU cache utilization in various parts of Had...
   Author: Todd Lipcon, 2013-02-05, 21:09
Re: Release numbering for branch-2 releases - MapReduce - [mail # dev]
...On Mon, Feb 4, 2013 at 2:14 PM, Suresh Srinivas wrote:  My issue with the current scheme is that there is little definition as to what alpha/beta/stable means. We're trying to boil down...
   Author: Todd Lipcon, 2013-02-04, 22:36
[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
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
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
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