Implementation:Apache Druid Overlord Dynamic Config Completions

Knowledge Sources	Apache_Druid
Domains	Web_Console, Overlord_Configuration
Last Updated	2026-02-10 10:00 GMT

Overview

OVERLORD_DYNAMIC_CONFIG_COMPLETIONS is a constant array of JSON completion rules that provides autocomplete suggestions for the Overlord dynamic configuration editor.

Description

This module exports a comprehensive typed array of JsonCompletionRule objects defining autocomplete behavior for the Overlord dynamic config. It covers the selectStrategy configuration including worker selection strategy types (equalDistribution, fillCapacity, category-based variants, and JavaScript), affinity configuration with strong/weak modes, and worker category specifications for task assignment. It also covers autoScaler configuration for EC2 and GCE platforms with their respective environment-specific sub-properties like availability zones, project IDs, and instance group names.

Usage

Used by the overlord-dynamic-config-dialog's JSON editor to provide contextual autocomplete suggestions when administrators configure task assignment strategies and auto-scaling behavior.

Code Reference

Source Location

• Repository: Apache Druid
• File: web-console/src/dialogs/overlord-dynamic-config-dialog/overlord-dynamic-config-completions.ts
• Lines: 1-252

Signature

import type { JsonCompletionRule } from '../../utils';

export const OVERLORD_DYNAMIC_CONFIG_COMPLETIONS: JsonCompletionRule[];

Import

import { OVERLORD_DYNAMIC_CONFIG_COMPLETIONS } from 'web-console/src/dialogs/overlord-dynamic-config-dialog/overlord-dynamic-config-completions';

I/O Contract

Inputs

Name	Type	Required	Description
(none)	-	-	This is a static constant with no runtime inputs

Outputs

Name	Type	Description
OVERLORD_DYNAMIC_CONFIG_COMPLETIONS	JsonCompletionRule[]	Array of completion rules covering selectStrategy (type, affinityConfig, workerCategorySpec), autoScaler (type, minNumWorkers, maxNumWorkers, envConfig for EC2/GCE), and task category mappings

Usage Examples

Passing to JsonInput

<JsonInput
  value={dynamicConfig}
  onChange={setDynamicConfig}
  jsonCompletions={OVERLORD_DYNAMIC_CONFIG_COMPLETIONS}
/>

Related Pages

• Environment:Apache_Druid_Web_Console_Development