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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hive/DeveloperGuide" by RussellMelick
Date Fri, 19 Nov 2010 23:26:20 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "Hive/DeveloperGuide" page has been changed by RussellMelick.
The comment on this change is: More information about debugging unit tests with eclipse.
http://wiki.apache.org/hadoop/Hive/DeveloperGuide?action=diff&rev1=27&rev2=28

--------------------------------------------------

  Debugging Hive
  
  === Debugging Hive code ===
- Hive code includes both client-side code (e.g., compiler, semantic analyzer, and optimizer
of HiveQL) and server-side code (e.g., operator/task/SerDe implementations). The client-side
code are running on your local machine so you can easily debug it using Eclipse the same way
as you debug a regular local Java code.  The server-side code is distributed and running on
the Hadoop cluster, so debugging server-side Hive code is a little bit complicated. In addition
to printing to log files using log4j, you can also attach the debugger to a different JVM
under unit test (single machine mode). Below are the steps on how to debug on server-side
code.
+ Hive code includes both client-side code (e.g., compiler, semantic analyzer, and optimizer
of HiveQL) and server-side code (e.g., operator/task/SerDe implementations). The client-side
code are running on your local machine so you can easily debug it using Eclipse the same way
as you debug a regular local Java code.  Here are the steps to debug code within a unit test.
+  * make sure that you have run {{{ant model-jar}}} in hive/metastore and {{{ant gen-test}}}
in hive/ql since the last time you ran {{{ant clean}}}
+  * To run all of the unit tests for the Cli, open up TestCliDriver.java
+   * click Run->Debug Configurations , select TestCliDriver, and click Debug
+  * To run a single test within TestCliDriver.java
+   * Begin running the whole TestCli suite as before
+   * Once it finishes the setup and starts executing the JUnit tests, stop the test execution
+   * Find the desired test in the JUnit pane
+   * Right click on that test and select Debug
+ 
+ The server-side code is distributed and running on the Hadoop cluster, so debugging server-side
Hive code is a little bit complicated. In addition to printing to log files using log4j, you
can also attach the debugger to a different JVM under unit test (single machine mode). Below
are the steps on how to debug on server-side code.
  
   * Compile Hive code with javac.debug=on. Under Hive checkout directory.
   {{{

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