Implementation:Apache Druid Compaction Dynamic Config Completions

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

Overview

Defines JSON autocompletion rules for the cluster-wide compaction dynamic configuration editor in the Druid web console.

Description

COMPACTION_DYNAMIC_CONFIG_COMPLETIONS is a constant array of JsonCompletionRule objects that provides context-aware autocompletion for editing the global compaction dynamic configuration. The rules cover root-level properties including compactionTaskSlotRatio, maxCompactionTaskSlots, compactionPolicy, useSupervisors, engine, and storeCompactionStatePerSegment. Conditional completions are provided for the engine property based on whether useSupervisors is enabled (allowing the MSQ engine option) or not (restricting to native only).

Usage

This module is consumed by the CompactionDynamicConfigDialog component, which passes the completions array to the JsonInput component when editing the cluster-wide compaction configuration in JSON mode.

Code Reference

Source Location

Repository: Apache Druid
File: web-console/src/dialogs/compaction-dynamic-config-dialog/compaction-dynamic-config-completions.ts
Lines: 1-138

Signature

export const COMPACTION_DYNAMIC_CONFIG_COMPLETIONS: JsonCompletionRule[]

Import

import { COMPACTION_DYNAMIC_CONFIG_COMPLETIONS } from './compaction-dynamic-config-completions';

I/O Contract

Inputs

Name	Type	Required	Description
(none)	N/A	N/A	This is a constant data definition with no runtime inputs

Outputs

Name	Type	Description
COMPACTION_DYNAMIC_CONFIG_COMPLETIONS	`JsonCompletionRule[]`	Array of completion rules covering root-level properties (compactionTaskSlotRatio, maxCompactionTaskSlots, compactionPolicy, useSupervisors, engine, storeCompactionStatePerSegment), suggested numeric values for slot ratios and limits, compactionPolicy type (newestSegmentFirst), and conditional engine options based on useSupervisors state

Usage Examples

Providing completions to the compaction dynamic config JSON editor

import { COMPACTION_DYNAMIC_CONFIG_COMPLETIONS } from './compaction-dynamic-config-completions';

<JsonInput
  value={dynamicConfig}
  height="50vh"
  onChange={setDynamicConfig}
  setError={setJsonError}
  jsonCompletions={COMPACTION_DYNAMIC_CONFIG_COMPLETIONS}
/>

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