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DEVELOPER_GUIDE.md

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Developer Guide

So you want to contribute code to this project? Excellent! We're glad you're here. Here's what you need to do.

Forking and Cloning

Fork this repository on GitHub, and clone locally with git clone.

Install Prerequisites

JDK 21

OpenSearch components build using Java 21 at a minimum. This means you must have a JDK 21 installed with the environment variable JAVA_HOME referencing the path to Java home for your JDK 21 installation, e.g. JAVA_HOME=/usr/lib/jvm/jdk-21.

Download Java 21 from here.

Setup

  1. Check out this package from version control.
  2. Launch Intellij IDEA, choose Import Project, and select the settings.gradle file in the root of this package.
  3. To build from the command line, set JAVA_HOME to point to a JDK >= 21 before running ./gradlew.

  • Unix System

    1. export JAVA_HOME=jdk-install-dir: Replace jdk-install-dir with the JAVA_HOME directory of your system.
    2. export PATH=$JAVA_HOME/bin:$PATH

  • Windows System

    1. Find My Computers from file directory, right click and select properties.
    2. Select the Advanced tab, select Environment variables.
    3. Edit JAVA_HOME to path of where JDK software is installed.

Build

The project in this package uses the Gradle build system. Gradle comes with excellent documentation that should be your first stop when trying to figure out how to operate or modify the build.

However, to build the index management plugin project, we also use the OpenSearch build tools for Gradle. These tools are idiosyncratic and don't always follow the conventions and instructions for building regular Java code using Gradle. Not everything in index management will work the way it's described in the Gradle documentation. If you encounter such a situation, the OpenSearch build tools source code is your best bet for figuring out what's going on.

Building from the command line

  1. ./gradlew build builds and tests project.
  2. ./gradlew run launches a single node cluster with the index management (and job-scheduler) plugin installed.
  3. ./gradlew run -PnumNodes=3 launches a multi-node cluster with the index management (and job-scheduler) plugin installed.
  4. ./gradlew integTest launches a single node cluster with the index management (and job-scheduler) plugin installed and runs all integ tests.
  5. ./gradlew integTest -PnumNodes=3 launches a multi-node cluster with the index management (and job-scheduler) plugin installed and runs all integ tests.
  6. ./gradlew integTest -Dtests.class=*RestChangePolicyActionIT runs a single integ class
  7. ./gradlew integTest -Dtests.class=*RestChangePolicyActionIT -Dtests.method="test missing index" runs a single integ test method (remember to quote the test method name if it contains spaces)
  8. ./gradlew indexmanagementBwcCluster#mixedClusterTask -Dtests.security.manager=false launches a cluster of three nodes of bwc version of OpenSearch with index management and tests backwards compatibility by performing rolling upgrade of each node with the current version of OpenSearch with index management.
  9. ./gradlew indexmanagementBwcCluster#rollingUpgradeClusterTask -Dtests.security.manager=false launches a cluster with three nodes of bwc version of OpenSearch with index management and tests backwards compatibility by performing rolling upgrade of each node with the current version of OpenSearch with index management.
  10. ./gradlew indexmanagementBwcCluster#fullRestartClusterTask -Dtests.security.manager=false launches a cluster with three nodes of bwc version of OpenSearch with index management and tests backwards compatibility by performing a full restart on the cluster upgrading all the nodes with the current version of OpenSearch with index management.
  11. ./gradlew bwcTestSuite -Dtests.security.manager=false runs all the above bwc tests combined.
  12. ./gradlew integTestRemote -Dtests.rest.cluster=localhost:9200 -Dtests.cluster=localhost:9200 -Dtests.clustername="docker-cluster" -Dhttps=true -Duser=admin -Dpassword=admin launches integration tests against a local cluster and run tests with security

When launching a cluster using one of the above commands, logs are placed in build/testclusters/integTest-0/logs. Though the logs are teed to the console, in practices it's best to check the actual log file.

Debugging

Sometimes it is useful to attach a debugger to either the OpenSearch cluster or the integ tests to see what's going on. When running unit tests, hit Debug from the IDE's gutter to debug the tests. For the OpenSearch cluster or the integ tests, first, make sure start a debugger listening on port 5005.

To debug the server code, run:

./gradlew :integTest -Dcluster.debug # to start a cluster with debugger and run integ tests

OR

./gradlew run --debug-jvm # to just start a cluster that can be debugged

The OpenSearch server JVM will connect to a debugger attached to localhost:5005.

The IDE needs to listen for the remote JVM. If using Intellij you must set your debug configuration to "Listen to remote JVM" and make sure "Auto Restart" is checked. You must start your debugger to listen for remote JVM before running the commands.

To debug code running in an integration test (which exercises the server from a separate JVM), first, setup a remote debugger listening on port 8000, and then run:

./gradlew :integTest -Dtest.debug

The test runner JVM will connect to a debugger attached to localhost:8000 before running the tests.

Additionally, it is possible to attach one debugger to the cluster JVM and another debugger to the test runner. First, make sure one debugger is listening on port 5005 and the other is listening on port 8000. Then, run:

./gradlew :integTest -Dtest.debug -Dcluster.debug

Using IntelliJ IDEA

Launch Intellij IDEA, choose Import Project, and select the settings.gradle file in the root of this package.

Submitting Changes

See CONTRIBUTING.

Backport