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Ozone components depends on maven classpath. We generate classpath descriptor from the maven pom.xml files to use exactly the same classpath at runtime.

As a result, it's easy to start All the components in IDE (eg. IntelliJ) as the right classpath (without provided scope) has already been set.

Since HDDS-1715 we have provide ready-to-use IntelliJ run configurations.

To start Ozone from Intellij you need the following:

(1) Stop your Intellij

(2) Execute the helper shell script:

./hadoop-ozone/dev-support/intellij/install-runconfigs.sh

Note: helper script doesn't do any special, just copy the committed runners to the right location in your intellij project folder.

(3) Start IntelliJ

As a result you can find the new run entries under the Run menu:

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To run ozone, you can use the installed Run configurations in the following order:

1. StorageContainerManagerInit (to initialize the SCM dir)
2. StorageContainerManger (to start SCM)
3. OzoneManagerInit (to initialize OM, it requires SCM)
4. OzoneManager
5. Datanode

Note: as of now we support only one datanode, but supporting multiple datanode processes can be added.See: Run Ozone cluster from IDE