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Dynamic configuration API

This document describes the API endpoints to retrieve and manage dynamic configurations for the Coordinator and Overlord in Apache Druid.

In this topic, http://ROUTER_IP:ROUTER_PORT is a placeholder for your Router service address and port. Replace it with the information for your deployment. For example, use http://localhost:8888 for quickstart deployments.

Coordinator dynamic configuration​

The Coordinator has dynamic configurations to tune certain behavior on the fly, without requiring a service restart. For information on the supported properties, see Coordinator dynamic configuration.

Get dynamic configuration​

Retrieves the current Coordinator dynamic configuration. Returns a JSON object with the dynamic configuration properties.

URL​

GET /druid/coordinator/v1/config

Responses​

Successfully retrieved dynamic configuration

Sample request​

curl "http://ROUTER_IP:ROUTER_PORT/druid/coordinator/v1/config"

Sample response​

View the response
{
    "millisToWaitBeforeDeleting": 900000,
    "mergeBytesLimit": 524288000,
    "mergeSegmentsLimit": 100,
    "maxSegmentsToMove": 100,
    "replicantLifetime": 15,
    "replicationThrottleLimit": 500,
    "balancerComputeThreads": 1,
    "killDataSourceWhitelist": [],
    "killPendingSegmentsSkipList": [],
    "maxSegmentsInNodeLoadingQueue": 500,
    "decommissioningNodes": [],
    "decommissioningMaxPercentOfMaxSegmentsToMove": 70,
    "pauseCoordination": false,
    "replicateAfterLoadTimeout": false,
    "maxNonPrimaryReplicantsToLoad": 2147483647,
    "useRoundRobinSegmentAssignment": true,
    "smartSegmentLoading": true,
    "debugDimensions": null
}

Update dynamic configuration​

Submits a JSON-based dynamic configuration spec to the Coordinator. For information on the supported properties, see Dynamic configuration.

URL​

POST /druid/coordinator/v1/config

Header parameters​

The endpoint supports a set of optional header parameters to populate the author and comment fields in the configuration history.

  • X-Druid-Author
    • Type: String
    • Author of the configuration change.
  • X-Druid-Comment
    • Type: String
    • Description for the update.

Responses​

Successfully updated dynamic configuration

Sample request​

curl "http://ROUTER_IP:ROUTER_PORT/druid/coordinator/v1/config" \
--header 'Content-Type: application/json' \
--data '{
  "millisToWaitBeforeDeleting": 900000,
  "mergeBytesLimit": 524288000,
  "mergeSegmentsLimit": 100,
  "maxSegmentsToMove": 5,
  "percentOfSegmentsToConsiderPerMove": 100,
  "useBatchedSegmentSampler": true,
  "replicantLifetime": 15,
  "replicationThrottleLimit": 10,
  "balancerComputeThreads": 1,
  "emitBalancingStats": true,
  "killDataSourceWhitelist": [],
  "killPendingSegmentsSkipList": [],
  "maxSegmentsInNodeLoadingQueue": 100,
  "decommissioningNodes": [],
  "decommissioningMaxPercentOfMaxSegmentsToMove": 70,
  "pauseCoordination": false,
  "replicateAfterLoadTimeout": false,
  "maxNonPrimaryReplicantsToLoad": 2147483647,
  "useRoundRobinSegmentAssignment": true
}'

Sample response​

A successful request returns an HTTP 200 OK message code and an empty response body.

Get dynamic configuration history​

Retrieves the history of changes to Coordinator dynamic configuration over an interval of time. Returns an empty array if there are no history records available.

URL​

GET /druid/coordinator/v1/config/history

Query parameters​

The endpoint supports a set of optional query parameters to filter results.

  • interval

    • Type: String
    • Limit the results to the specified time interval in ISO 8601 format delimited with /. For example, 2023-07-13/2023-07-19. The default interval is one week. You can change this period by setting druid.audit.manager.auditHistoryMillis in the runtime.properties file for the Coordinator.

  • count

    • Type: Integer
    • Limit the number of results to the last n entries.

Responses​

Successfully retrieved history

Sample request​

The following example retrieves the dynamic configuration history between 2022-07-13 and 2024-07-19. The response is limited to 10 entries.

curl "http://ROUTER_IP:ROUTER_PORT/druid/coordinator/v1/config/history?interval=2022-07-13%2F2024-07-19&count=10"

Sample response​

View the response
[
    {
        "key": "coordinator.config",
        "type": "coordinator.config",
        "auditInfo": {
            "author": "",
            "comment": "",
            "ip": "127.0.0.1"
        },
        "payload": "{\"millisToWaitBeforeDeleting\":900000,\"mergeBytesLimit\":524288000,\"mergeSegmentsLimit\":100,\"maxSegmentsToMove\":5,\"replicantLifetime\":15,\"replicationThrottleLimit\":10,\"balancerComputeThreads\":1,\"killDataSourceWhitelist\":[],\"killPendingSegmentsSkipList\":[],\"maxSegmentsInNodeLoadingQueue\":100,\"decommissioningNodes\":[],\"decommissioningMaxPercentOfMaxSegmentsToMove\":70,\"pauseCoordination\":false,\"replicateAfterLoadTimeout\":false,\"maxNonPrimaryReplicantsToLoad\":2147483647,\"useRoundRobinSegmentAssignment\":true,\"smartSegmentLoading\":true,\"debugDimensions\":null}",
        "auditTime": "2023-10-03T20:59:51.622Z"
    }
]

Overlord dynamic configuration​

The Overlord has dynamic configurations to tune how Druid assigns tasks to workers. For information on the supported properties, see Overlord dynamic configuration.

Get dynamic configuration​

Retrieves the current Overlord dynamic configuration. Returns a JSON object with the dynamic configuration properties. Returns an empty response body if there is no current Overlord dynamic configuration.

URL​

GET /druid/indexer/v1/worker

Responses​

Successfully retrieved dynamic configuration

Sample request​

curl "http://ROUTER_IP:ROUTER_PORT/druid/indexer/v1/worker"

Sample response​

View the response
{
    "type": "default",
    "selectStrategy": {
        "type": "fillCapacityWithCategorySpec",
        "workerCategorySpec": {
            "categoryMap": {},
            "strong": true
        }
    },
    "autoScaler": null
}

Update dynamic configuration​

Submits a JSON-based dynamic configuration spec to the Overlord. For information on the supported properties, see Overlord dynamic configuration.

URL​

POST /druid/indexer/v1/worker

Header parameters​

The endpoint supports a set of optional header parameters to populate the author and comment fields in the configuration history.

  • X-Druid-Author
    • Type: String
    • Author of the configuration change.
  • X-Druid-Comment
    • Type: String
    • Description for the update.

Responses​

Successfully updated dynamic configuration

Sample request​

curl "http://ROUTER_IP:ROUTER_PORT/druid/indexer/v1/worker" \
--header 'Content-Type: application/json' \
--data '{
  "type": "default",
  "selectStrategy": {
    "type": "fillCapacityWithCategorySpec",
    "workerCategorySpec": {
      "categoryMap": {},
      "strong": true
    }
  },
  "autoScaler": null
}'

Sample response​

A successful request returns an HTTP 200 OK message code and an empty response body.

Get dynamic configuration history​

Retrieves the history of changes to Overlord dynamic configuration over an interval of time. Returns an empty array if there are no history records available.

URL​

GET /druid/indexer/v1/worker/history

Query parameters​

The endpoint supports a set of optional query parameters to filter results.

  • interval

    • Type: String
    • Limit the results to the specified time interval in ISO 8601 format delimited with /. For example, 2023-07-13/2023-07-19. The default interval is one week. You can change this period by setting druid.audit.manager.auditHistoryMillis in the runtime.properties file for the Overlord.

  • count

    • Type: Integer
    • Limit the number of results to the last n entries.

Responses​

Successfully retrieved history

Sample request​

The following example retrieves the dynamic configuration history between 2022-07-13 and 2024-07-19. The response is limited to 10 entries.

curl "http://ROUTER_IP:ROUTER_PORT/druid/indexer/v1/worker/history?interval=2022-07-13%2F2024-07-19&count=10"

Sample response​

View the response
[
    {
        "key": "worker.config",
        "type": "worker.config",
        "auditInfo": {
            "author": "",
            "comment": "",
            "ip": "127.0.0.1"
        },
        "payload": "{\"type\":\"default\",\"selectStrategy\":{\"type\":\"fillCapacityWithCategorySpec\",\"workerCategorySpec\":{\"categoryMap\":{},\"strong\":true}},\"autoScaler\":null}",
        "auditTime": "2023-10-03T21:49:49.991Z"
    }
]

Get an array of worker nodes in the cluster​

Returns an array of all the worker nodes in the cluster along with its corresponding metadata.

GET /druid/indexer/v1/workers

Responses​

Successfully retrieved worker nodes

Sample request​

curl "http://ROUTER_IP:ROUTER_PORT/druid/indexer/v1/workers"

Sample response​

View the response
[
    {
        "worker": {
            "scheme": "http",
            "host": "localhost:8091",
            "ip": "198.51.100.0",
            "capacity": 2,
            "version": "0",
            "category": "_default_worker_category"
        },
        "currCapacityUsed": 0,
        "currParallelIndexCapacityUsed": 0,
        "availabilityGroups": [],
        "runningTasks": [],
        "lastCompletedTaskTime": "2023-09-29T19:13:05.505Z",
        "blacklistedUntil": null
    }
]

Get scaling events​

Returns Overlord scaling events if autoscaling runners are in use. Returns an empty response body if there are no Overlord scaling events.

URL​

GET /druid/indexer/v1/scaling

Responses​

Successfully retrieved scaling events

Sample request​

curl "http://ROUTER_IP:ROUTER_PORT/druid/indexer/v1/scaling"

Sample response​

A successful request returns a 200 OK response and an array of scaling events.