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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. {{{
