xyuanlu

**Is your feature request related to a problem? Please describe.** Helix cloud event handling need a set of util functions to track instance enable/disable **Describe the solution you'd like** Previously...

### Describe the bug Helix is reading MultiZK config from jvm only when initiating ZkHelixManager. Helix should also read from user passed in connectionConfig.

### Describe the bug ``` 2022-05-15T20:32:53.2585338Z [ERROR] Tests run: 205, Failures: 1, Errors: 0, Skipped: 35, Time elapsed: 146.079 s

### Describe the bug When global rebalance failed, Waged metrics rebalanceFailureCount is not increased. This failure is not tacked by metrics.

**Is your feature request related to a problem? Please describe.** Maintenance Management service fails silently when user provided OperationInterface returns null in take/freeInstance API. **Describe the solution you'd like** We...

Inconsistent behavior in getIdealAssignmentForFullAuto and getImmediateAssignmentForWagedFullAuto -- delayed rebalance

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**Is your feature request related to a problem? Please describe.** Helix has 2 functions to return potential cluster partition assignment for any cluster state change. getIdealAssignmentForFullAuto for ChrushEd resources and...

[WIP] Add new submodule meta client - a generic metadata client

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### Issues [WIP] This is a draft PR for meta client. It should be merged to a feature branch instead on master. - [ ] My PR addresses the following...

### Describe the bug When adding/removing instance from a cluster, it is possible that at a point of time, instance config is gone but the INSTANCE ZNode is still there....

**Is your feature request related to a problem? Please describe.** Helix-rest apis like stoppable and partition assignment reads the whole cluster's info every time. When these APIs are called multiple...

**Is your feature request related to a problem? Please describe.** Right now Helix does not provide user with an option to prepare planned host removal. Many replicas will have n-1...