Mongo Db connector - Connection timeout when trying to connect to AWS Document DB

[rijin-thomas]

I am on Databricks Run Time LTE 14.3 Spark 3.5.0 Scala 2.12 and mongodb-spark-connector_2.12:10.2.0. 

Trying to connect to Document DB using the connector and all I get is a connection timeout. I tried using PyMongo, which works as expected and I can read from the db. I have a CA_File that I'm passing as an argument and it's stored in Unity Catalog. 

Code:

CONNECTION_URI = f"mongodb://{USERNAME}:{PASSWORD}@{ENDPOINT}:27017/{DATABASE_NAME}?replicaSet=rs0&readPreference=secondaryPreferred"

df = spark.read.format("mongodb") \
     .option("spark.mongodb.read.connection.uri", CONNECTION_URI) \
     .option("collection", COLLECTION) \
     .option("ssl", "true") \
     .option("ssl.CAFile", DBFS_CA_FILE) \
     .option("ssl.enabledProtocols", "TLSv1.2") \
     .load()

 Connector error:

SparkConnectGrpcException: (com.mongodb.MongoTimeoutException) Timed out after 30000 ms while waiting for a server that matches com.mongodb.client.internal.MongoClientDelegate. Client view of state is {type=REPLICA_SET, servers=[{address=<endpoint>, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketReadTimeoutException: Timeout while receiving message}, caused by {java.net.SocketTimeoutException: Read timed out}}]