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From "Scott Carey (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6884) Add LOG.isDebugEnabled() guard for each LOG.debug("...")
Date Tue, 17 Aug 2010 01:23:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899228#action_12899228

Scott Carey commented on HADOOP-6884:

bq. Also #3 seems to be fairly simple with a single "around" advice in aspectj and a couple
of lines for ajc target in build.xml. Why use an ad-hoc script that's known (according Erik
himself) to have false positive that require manual inspection (which is also not part of
the version controlled source tree), when you we have a built-in (aspectj*.jars are already
included as build/runtime dependencies) tool specifically for such tasks?

You can do this for info messages too for more performance when that is off.  There are no
extra lines of code or maintenance; it is the simplest solution.  As long as the change is
applied at build time, I don't see any real drawback.

> Add LOG.isDebugEnabled() guard for each LOG.debug("...")
> --------------------------------------------------------
>                 Key: HADOOP-6884
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6884
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 0.22.0
>            Reporter: Erik Steffl
>            Assignee: Erik Steffl
>             Fix For: 0.22.0
>         Attachments: HADOOP-6884-0.22-1.patch, HADOOP-6884-0.22.patch
> Each LOG.debug("...") should be executed only if LOG.isDebugEnabled() is true, in some
cases it's expensive to construct the string that is being printed to log. It's much easier
to always use LOG.isDebugEnabled() because it's easier to check (rather than in each case
reason whether it's necessary or not).

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