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IntelliJ Setup

This document contains some examples and instructions on how to get IntelliJ setup to run local debugging and test setups of Druid.

Project SDK

The "SDK", configured for the Druid project, must be called 1.8, to avoid annoying changes of .idea/misc.xml file, that you shouldn't check into your commits. If you don't have an SDK on your dev machine with this name, you should either rename one of the existing SDKs to 1.8, or create another one with this name, and it could point to the same files as some other existing SDK, even if it's actually JDK 9+. 1.8 is just an alias name. You can do this in Using File -> Project Structure... -> Platform Settings -> SDKs (see also IntelliJ help page about this):

Code Style

The Code Style is available in XML format at druid_intellij_formatting.xml and can be imported into IntelliJ.

Set Code Coverage Runner

Druid CI checks are configured to enforce code coverage using JaCoCo. The checks will prevent PR from being merged if test coverage of new added code is below the set threshold. You should run the tests locally to make sure that your code pass the coverage threshold. In IntelliJ, edit the template of JUnit tests in "Run Configurations..." to use Jacoco for code coverage (this provides branch coverage instead of the default which is only line coverage). You can then right click src/test/java folder of the modules you are modifying and click run with coverage. This will generate a report to show the current code coverage on the code (not just your change).

Git Checkstyle Verification Hook (Optional)

Git Checkstyle pre-commit hook can be installed to automatically run checkstyle verification before committing, saving cycle from avoiding the checkstyle failing later in Travis/CI environment. The hook can be setup easily by running the <DRUID_HOME>/hooks/install-hooks.sh script.

Metadata

The installation of a MySQL metadata store is outside the scope of this document, but instructions on setting up MySQL can be found at docs/development/extensions-core/mysql.md. This assumes you followed the example there and have a database named druid with proper permissions for a user named druid and a password of diurd.

Use of other databases such as Postgres or Derby are entirely reasonable, but doing so is left as an excercise to the reader.

ZooKeeper

This also assumes you have ZooKeeper running locally, which usually just involves downloading the latst distribution of ZooKeeper, doing some minor configuration in ZooKeeper's conf/ directory (most defaults are fine), then running ./bin/zkServer.sh start in the ZooKeeper directory.

On macOS, you can also achieve this through the following commands

brew install zookeeper
brew services start zookeeper

Initial Build

Before running or debugging the apps, you should do a mvn clean install -Pdist -DskipTests in the Druid source in order to make sure directories are populated correctly.

-Pdist is required because it puts all core extensions under distribution\target\extensions directory, where runConfigurations below could load extensions from.

You may also add -Ddruid.console.skip=true to the command if you're focusing on backend servers instead of frontend project. This option saves great building time.

XML App Def

You can configure application definitions in XML for import into IntelliJ. Below are a few examples. These should be placed in an XML file in .idea/runConfigurations in the Druid source code.

Historical.xml

<component name="ProjectRunConfigurationManager">
  <configuration default="false" name="Historical" type="Application" factoryName="Application">
    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
    <option name="MAIN_CLASS_NAME" value="org.apache.druid.cli.Main" />
    <option name="VM_PARAMETERS" value="-server -Duser.timezone=UTC -Dfile.encoding=UTF-8 -Xmx2G -XX:MaxJavaStackTraceDepth=9999 -XX:+UseG1GC -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintAdaptiveSizePolicy -XX:+PrintReferenceGC -verbose:gc -XX:+PrintFlagsFinal -Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager -Dorg.jboss.logging.provider=slf4j -Dlog4j.configurationFile=$PROJECT_DIR$/core/src/main/resources/log4j2.debug.xml -Ddruid.host=localhost -Ddruid.service=historical -Ddruid.processing.buffer.sizeBytes=100000000 -Ddruid.extensions.hadoopDependenciesDir=$PROJECT_DIR$/distribution/target/hadoop-dependencies/ -Ddruid.extensions.directory=$PROJECT_DIR$/distribution/target/extensions/ -Ddruid.extensions.loadList=[\&quot;druid-s3-extensions\&quot;,\&quot;druid-histogram\&quot;,\&quot;mysql-metadata-storage\&quot;] -Ddruid.historical.cache.useCache=false -Ddruid.historical.cache.populateCache=false -Ddruid.segmentCache.locations=&quot;[{\&quot;path\&quot;:\&quot;/tmp/druid/indexCache\&quot;,\&quot;maxSize\&quot;:10000000000}]&quot; -Ddruid.zk.service.host=localhost -Ddruid.processing.numThreads=1 -Ddruid.server.http.numThreads=50 -Ddruid.serverview.type=batch -Ddruid.emitter=logging" />
    <option name="PROGRAM_PARAMETERS" value="server historical" />
    <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$" />
    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
    <option name="ALTERNATIVE_JRE_PATH" value="1.8" />
    <option name="ENABLE_SWING_INSPECTOR" value="false" />
    <option name="ENV_VARIABLES" />
    <option name="PASS_PARENT_ENVS" value="true" />
    <module name="druid-services" />
    <envs />
    <method />
  </configuration>
</component>

Coordinator.xml

<component name="ProjectRunConfigurationManager">
  <configuration default="false" name="Coordinator" type="Application" factoryName="Application">
    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
    <option name="MAIN_CLASS_NAME" value="org.apache.druid.cli.Main" />
    <option name="VM_PARAMETERS" value="-server -Duser.timezone=UTC -Dfile.encoding=UTF-8 -Xmx256M -Xmx256M -XX:+UseG1GC -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintAdaptiveSizePolicy -XX:+PrintReferenceGC -verbose:gc -XX:+PrintFlagsFinal -Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager -Dorg.jboss.logging.provider=slf4j -Ddruid.host=localhost -Ddruid.service=coordinator -Ddruid.extensions.directory=$PROJECT_DIR$/distribution/target/extensions/ -Ddruid.extensions.loadList=[\&quot;druid-s3-extensions\&quot;,\&quot;druid-histogram\&quot;,\&quot;mysql-metadata-storage\&quot;] -Ddruid.zk.service.host=localhost -Ddruid.metadata.storage.type=mysql -Ddruid.metadata.storage.connector.connectURI=&quot;jdbc:mysql://localhost:3306/druid&quot; -Ddruid.metadata.storage.connector.user=druid -Ddruid.metadata.storage.connector.password=diurd -Ddruid.serverview.type=batch -Ddruid.emitter=logging -Ddruid.coordinator.period=PT10S -Ddruid.coordinator.startDelay=PT5S" />
    <option name="PROGRAM_PARAMETERS" value="server coordinator" />
    <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$" />
    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
    <option name="ALTERNATIVE_JRE_PATH" value="1.8" />
    <option name="ENABLE_SWING_INSPECTOR" value="false" />
    <option name="ENV_VARIABLES" />
    <option name="PASS_PARENT_ENVS" value="true" />
    <module name="druid-services" />
    <envs />
    <method />
  </configuration>
</component>

property files

You can also provide a property file for running or debugging the application through intellij.

For example, put a file named as common.properties under .idea/conf directory, then add -Ddruid.properties.file=$PROJECT_DIR$/.idea/conf/common.properties to VM_PARAMETERS in the App Def file.

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