santosh-d3vpl3x opened a new pull request, #18843:
URL: https://github.com/apache/druid/pull/18843
Fixes #18746.
### Description
Add contrib extension `druid-consul-extensions` to let Druid use Consul for
service discovery and Coordinator/Overlord leader election as
an alternative to ZooKeeper, using the HTTP server view and indexer runner.
#### Consul-based discovery and leader election
- Wire `ConsulDiscoveryModule` to provide Consul-backed announcer, discovery
provider, and leader selector when the extension is enabled.
- Implement `ConsulDruidNodeAnnouncer`, `ConsulDruidNodeDiscoveryProvider`,
and `ConsulLeaderSelector` on top of `ConsulApiClient` /
`DefaultConsulApiClient`, with `ConsulServiceIds`, `ConsulDiscoveryConfig`,
and `ConsulSSLConfig` for configuration.
- Add `ConsulMetrics`, retry/backoff handling, and clear logging around
registration, watches, and leader lock lifecycle.
#### Tests and documentation
- Add unit tests for config, announcer, leader selector, client security,
and service ID behavior.
- Add embedded/docker Consul discovery tests covering plain, TLS, and mTLS,
including restart/failover.
- Document the extension, configuration examples, a basic Consul dev
harness, and a high-level migration path from ZooKeeper.
#### Release note
Add optional contrib extension `druid-consul-extensions` that lets Druid
clusters use Consul for service discovery and
Coordinator/Overlord leader election instead of ZooKeeper, with support for
ACLs, TLS/mTLS, and metrics. This requires
`druid.serverview.type=http` and `druid.indexer.runner.type=httpRemote` to
be enabled cluster-wide before switching selectors to Consul.
---
##### Key changed/added classes in this PR
-
`extensions-contrib/consul-extensions/src/main/java/org/apache/druid/consul/discovery/ConsulDiscoveryModule`
-
`extensions-contrib/consul-extensions/src/main/java/org/apache/druid/consul/discovery/ConsulDiscoveryConfig`
-
`extensions-contrib/consul-extensions/src/main/java/org/apache/druid/consul/discovery/ConsulDruidNodeAnnouncer`
-
`extensions-contrib/consul-extensions/src/main/java/org/apache/druid/consul/discovery/ConsulDruidNodeDiscoveryProvider`
-
`extensions-contrib/consul-extensions/src/main/java/org/apache/druid/consul/discovery/ConsulLeaderSelector`
-
`extensions-contrib/consul-extensions/src/main/java/org/apache/druid/consul/discovery/ConsulApiClient`
-
`embedded-tests/src/test/java/org/apache/druid/testing/embedded/docker/BaseConsulDiscoveryDockerTest`
and Consul Docker test subclasses
---
This PR has:
- [x] been self-reviewed.
- [x] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [x] added documentation for new or modified features or behaviors.
- [x] a release note entry in the PR description.
- [x] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [x] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [x] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [x] added integration tests.
- [x] been tested in a test Druid cluster.
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