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[HADOOP-8757] Metrics should disallow names with invalid characters - Hadoop - [issue]
...Just spent a couple hours trying to figure out why a metric I added didn't show up in JMX, only to eventually realize it was because I had a whitespace in the property name. This didn't caus...
http://issues.apache.org/jira/browse/HADOOP-8757    Author: Todd Lipcon, 2012-09-01, 02:48
Re: [DISCUSS] Spin out MR, HDFS and YARN as their own TLPs and disband Hadoop umbrella project - Hadoop - [mail # general]
...On Fri, Aug 31, 2012 at 9:58 AM, Robert Evans  wrote:  I haven't been in the MR codebase much of late, so I'll defer to your judgment here: would it be feasible to have an abstract...
   Author: Todd Lipcon, 2012-08-31, 17:06
[HADOOP-7754] Expose file descriptors from Hadoop-wrapped local FileSystems - Hadoop - [issue]
...In HADOOP-7714, we determined that using fadvise inside of the MapReduce shuffle can yield very good performance improvements. But many parts of the shuffle are FileSystem-agnostic and thus ...
http://issues.apache.org/jira/browse/HADOOP-7754    Author: Todd Lipcon, 2012-08-16, 00:20
[HADOOP-7714] Umbrella for usage of native calls to manage OS cache and readahead - Hadoop - [issue]
...Especially in shared HBase/MR situations, management of the OS buffer cache is important. Currently, running a big MR job will evict all of HBase's hot data from cache, causing HBase perform...
http://issues.apache.org/jira/browse/HADOOP-7714    Author: Todd Lipcon, 2012-08-03, 10:19
[HADOOP-6133] ReflectionUtils performance regression - Hadoop - [issue]
...HADOOP-4187 introduced extra calls to Class.forName in ReflectionUtils.setConf. This caused a fairly large performance regression. Attached is a microbenchmark that shows the following timin...
http://issues.apache.org/jira/browse/HADOOP-6133    Author: Todd Lipcon, 2012-07-30, 14:37
Re: Re: HDFS block physical location - Hadoop - [mail # user]
...Hi JS,  You may also be interested in the following JIRA which proposes an API for block->disk mapping information: https://issues.apache.org/jira/browse/HDFS-3672  There has be...
   Author: Todd Lipcon, 2012-07-25, 22:51
[HADOOP-7761] Improve performance of raw comparisons - Hadoop - [issue]
...Guava has a nice implementation of lexicographical byte-array comparison that uses sun.misc.Unsafe to compare unsigned byte arrays long-at-a-time. Their benchmarks show it as being 2x more C...
http://issues.apache.org/jira/browse/HADOOP-7761    Author: Todd Lipcon, 2012-07-23, 17:52
[HADOOP-8609] IPC server logs a useless message when shutting down socket - Hadoop - [issue]
...I occasionally see this WARN message out of the NameNode:12/07/19 10:37:37 WARN ipc.Server: Ignoring socket shutdown exceptionwith no further details. This message isn't useful - it either n...
http://issues.apache.org/jira/browse/HADOOP-8609    Author: Todd Lipcon, 2012-07-21, 14:03
Re: [DISCUSS] Merge *-user@hadoop lists? - Hadoop - [mail # general]
...Sure, +1. I already subscribe to all and filter into the same mailbox anyway :)  -Todd  On Fri, Jul 20, 2012 at 11:34 AM, Mahadev Konar  wrote:    Todd Lipcon Softwa...
   Author: Todd Lipcon, 2012-07-20, 19:05
[HADOOP-8397] NPE thrown when IPC layer gets an EOF reading a response - Hadoop - [issue]
...When making a call on an IPC connection where the other end has shut down, I see the following exception:Caused by: java.lang.NullPointerException        at org.apac...
http://issues.apache.org/jira/browse/HADOOP-8397    Author: Todd Lipcon, 2012-07-20, 18:32
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