config.json

Source Configuration

Below is a sample config.json for connecting to a MongoDB replica set. Customize each field to match your environment.

olake_folder/config.json

{
  "hosts": [
    "host1:27017",
    "host2:27017",
    "host3:27017"
  ],
  "username": "test",
  "password": "test",
  "authdb": "admin",
  "replica-set": "rs0",
  "read-preference": "secondaryPreferred",
  "srv": true,
  "server-ram": 16,
  "database": "database",
  "max_threads": 50,
  "default_mode": "cdc",
  "backoff_retry_count": 2
}

Description of above parameters

Field	Description	Example Value	Data Type
hosts	List of MongoDB hosts. Use DNS SRV if srv = true.	x.xxx.xxx.120:27017, x.xxx.xxx.120:27017, x.xxx.xxx.133:27017 (can be multiple)	[]STRING
username/password	Credentials for MongoDB authentication.	"test"/"test"	STRING
authdb	Authentication database (often admin).	"admin"	STRING
replica-set	Name of the replica set, if applicable.	"rs0"	STRING
read-preference	Which node to read from (e.g., secondaryPreferred).	"secondaryPreferred"	STRING
srv	If using DNS SRV connection strings, set to true.	true, false	BOOL
server-ram	Memory management hint for the OLake container.	16	UINT
database	The MongoDB database name to replicate.	"database_name"	STRING
max_threads	Maximum parallel threads for chunk-based snapshotting.	50	INT
default_mode	Default sync mode ("cdc" or "full_refresh").	"cdc", "full_refresh", "incremental" (WIP)
backoff_retry_count	Retries attempt to establish sync again if it fails, increases exponentially ( in minutes - 1, 2,4,8,16... depending upon the backoff_retry_count value)	defaults to 3, takes default value if set to -1	INT

Refer here for more about sync modes.