You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2018/06/21 17:51:00 UTC

[jira] [Created] (HADOOP-15554) Improve JIT performance for Configuration parsing

Todd Lipcon created HADOOP-15554:
------------------------------------

             Summary: Improve JIT performance for Configuration parsing
                 Key: HADOOP-15554
                 URL: https://issues.apache.org/jira/browse/HADOOP-15554
             Project: Hadoop Common
          Issue Type: Improvement
          Components: conf, performance
    Affects Versions: 3.0.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


In investigating a performance regression for small tasks between Hadoop 2 and Hadoop 3, we found that the amount of time spent in JIT was significantly higher. Using jitwatch we were able to determine that, due to a combination of switching from DOM to SAX style parsing and just having more configuration key/value pairs, Configuration.loadResource is now getting compiled with the C2 compiler and taking quite some time. Breaking that very large function up into several smaller ones and eliminating some redundant bits of code improves the JIT performance measurably.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: common-dev-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-dev-help@hadoop.apache.org