Percona Link for MongoDB HTTP API documentation

Quick start guide

To get started with Percona Link for MongoDB API:

1. Ensure the service is running on http://localhost:2242
2. Use the /start endpoint to begin replication
3. Monitor progress using the /status endpoint
4. Use /pause and /resume to control the replication process
5. Call /finalize when replication is complete

Authentication

Currently, the API does not require authentication. However, it’s recommended to run the service behind a reverse proxy with proper authentication in production environments.

API endpoints

POST /start

Starts the replication process.

Request

Parameter	Type	Required	Description
includeNamespaces	string[]	No	List of namespaces to include in replication (for example, [“db.*”, “db.collection”])
excludeNamespaces	string[]	No	List of namespaces to exclude from replication

Example:

curl -X POST http://localhost:2242/start -d '{
    "includeNamespaces": ["dbName.*", "anotherDB.collName1", "anotherDB.collName2"],
    "excludeNamespaces": ["dbName.collName"]
}'

Response

• ok: Boolean indicating if the operation was successful.
• error (optional): Error message if the operation failed.

Example:

{ "ok": true }

POST /finalize

Finalizes the replication process.

Request

Example:

curl -X POST http://localhost:2242/finalize

Response

• ok: Boolean indicating if the operation was successful.
• error (optional): Error message if the operation failed.

Example:

{ "ok": true }

POST /pause

Pauses the replication process.

Request

Example:

curl -X POST http://localhost:2242/pause

Response

• ok: Boolean indicating if the operation was successful.
• error (optional): Error message if the operation failed.

Example:

{ "ok": true }

POST /resume

Resumes the replication process.

Request

Example:

curl -X POST http://localhost:2242/resume

Resume from failure:

curl -X POST http://localhost:2242/resume -d '{
  "fromFailure": true
}'

Response

• ok: Boolean indicating if the operation was successful.
• error (optional): Error message if the operation failed.

Example:

{ "ok": true }

GET /status

The /status endpoint provides the current state of the Percona Link for MongoDB replication process, including its progress, lag, and event processing details.

Request

Example:

curl -X GET http://localhost:2242/status

Response

The following are response fields:

Field	Type	Description
ok	boolean	Operation success status
state	string	Current replication state
info	string	Additional information about the current state
error	string	(optional): The error message if the operation failed.
lagTime	number	Current lag time in logical seconds between source and target clusters.
eventsProcessed	number	Total events processed
lastReplicatedOpTime	string	The last replicated operation time.
initialSync.completed	boolean	Initial sync completion status
initialSync.lagTime	number	The lag time in logical seconds until the initial sync completed
initialSync.cloneCompleted	boolean	Clone process completion status
initialSync.estimatedCloneSize	number	Estimated total size to clone (bytes)
initialSync.clonedSize	number	Current cloned size (bytes)

Example:

{
    "ok": true,
    "state": "running",
    "info": "Initial Sync",

    "lagTime": 22,
    "eventsProcessed": 5000,
    "lastReplicatedOpTime": "1740335200.5",

    "initialSync": {
        "completed": false,
        "lagTime": 5,

        "cloneCompleted": false,
        "estimatedCloneSize": 5000000000,
        "clonedSize": 2500000000
    }
}

Error handling

The API uses standard HTTP status codes and returns error messages in the following format:

{
    "ok": false,
    "error": "Detailed error message"
}

Common error scenarios:

• 400 Bad Request: Invalid request parameters
• 404 Not Found: Endpoint not found
• 500 Internal Server Error: Server-side issues

---

Last update: October 8, 2025
Created: October 8, 2025