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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9344) Configuration.writeXml can warn about deprecated properties user did not set
Date Thu, 28 Feb 2013 04:21:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13589174#comment-13589174
] 

Jason Lowe commented on HADOOP-9344:
------------------------------------

Here's a simple way to demonstrate the issue:

{code}
  public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    conf.set("fs.defaultFS", "foobar");
    conf.writeXml(System.out);
  }
{code}

Even though the code only set {{fs.defaultFS}} the following warning is emitted:

{noformat}
2013-02-28 04:16:29,213 WARN  [main] conf.Configuration (Configuration.java:warnOnceIfDeprecated(823))
- fs.default.name is deprecated. Instead, use fs.defaultFS
{noformat}
                
> Configuration.writeXml can warn about deprecated properties user did not set
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-9344
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9344
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: conf
>    Affects Versions: 2.0.3-alpha, 0.23.5
>            Reporter: Jason Lowe
>
> When the configuration is serialized it can emit warnings about deprecated properties
that the user did not specify.  Converting the config to XML causes all the properties in
the config to be processed for deprecation, and after HADOOP-8167 setting a proper config
property also causes the deprecated forms to be set.  Processing all the keys in the config
for deprecation therefore can trigger warnings for keys that were never specified by the user,
leaving users confused as to how their code could be triggering these warnings.

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