# Debugging Kyuubi You can use the [Java Debug Wire Protocol](https://docs.oracle.com/javase/8/docs/technotes/guides/jpda/conninv.html#Plugin) to debug Kyuubi with your favorite IDE tool, e.g. IntelliJ IDEA. ## Debugging Server We can configure the JDWP agent in `KYUUBI_JAVA_OPTS` for debugging. For example, ```bash KYUUBI_JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 \ bin/kyuubi start ``` In the IDE, you set the corresponding parameters(host&port) in debug configurations, for example,

![](../imgs/idea_debug.png)

## Debugging Engine We can configure the Kyuubi properties to enable debugging engine. ### Flink Engine ```bash kyuubi.engine.flink.java.options -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` ### Trino Engine ```bash kyuubi.engine.trino.java.options -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` ### Hive Engine ```bash kyuubi.engine.hive.java.options -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` ## Debugging Apps ### Spark Engine - Spark Driver ```bash spark.driver.extraJavaOptions -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` - Spark Executor ```bash spark.executor.extraJavaOptions -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` ### Flink Engine - Flink Processes ```bash env.java.opts -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` - Flink JobManager ```bash env.java.opts.jobmanager -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` - Flink TaskManager ```bash env.java.opts.taskmanager -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` - Flink HistoryServer ```bash env.java.opts.historyserver -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ``` - Flink Client ```bash env.java.opts.client -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ```