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Hive, mail # user - Question regarding serde2.s3.S3LogDeserializer.java


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Question regarding serde2.s3.S3LogDeserializer.java
Brandon Luth 2013-03-20, 18:52
Hello all,

I recently came across the following piece of code in
https://svn.apache.org/repos/asf/hive/trunk/contrib/src/java/org/apache/hadoop/hive/contrib/serde2/s3/S3LogDeserializer.java
:

  *static* *{*

    StackTraceElement*[]* sTrace *=* *new* Exception*().*getStackTrace*();*

    sTrace*[*0*].*getClassName*();*

  *}*

*
*

One question: What is this used for?

>From what I can tell its dead code.
Also there is similar code at
http://javasourcecode.org/html/open-source/hive/hive-0.9.0/org/apache/hadoop/hive/serde2/TestSerDe.java.html
:

  static {
    StackTraceElement
<http://javasourcecode.org/html/open-source/jdk/jdk-6u23/java/lang/StackTraceElement.java.html>[]
sTrace = new Exception
<http://javasourcecode.org/html/open-source/jdk/jdk-6u23/java/lang/Exception.java.html>().getStackTrace();
    String <http://javasourcecode.org/html/open-source/jdk/jdk-6u23/java/lang/String.java.html>
className = sTrace[0].getClassName();
    try {
      SerDeUtils.registerSerDe(shortName(), Class.forName(className));
      // For backward compatibility: this class replaces the following
class.      SerDeUtils.registerSerDe("org.apache.hadoop.hive.serde.TestSerDe",
Class
          .forName(className));
    } catch (Exception
<http://javasourcecode.org/html/open-source/jdk/jdk-6u23/java/lang/Exception.java.html>
e) {
      throw new RuntimeException
<http://javasourcecode.org/html/open-source/jdk/jdk-6u23/java/lang/RuntimeException.java.html>(e);
    }
  }

Which seems to do something, however I can't tell the difference between
the above and simple hard coding the class name; other than you can blindly
copy paste this code without changing that hard coded class name?

Any help in understanding this?

Thanks,

Brandon