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Chapter 39. MongoDB Source
Consume documents from MongoDB.
If the persistentTailTracking option will be enabled, the consumer will keep track of the last consumed message and on the next restart, the consumption will restart from that message. In case of persistentTailTracking enabled, the tailTrackIncreasingField must be provided (by default it is optional).
If the persistentTailTracking option won’t be enabled, the consumer will consume the whole collection and wait in idle for new documents to consume.
39.1. Configuration Options
The following table summarizes the configuration options available for the mongodb-source Kamelet:
| Property | Name | Description | Type | Default | Example |
|---|---|---|---|---|---|
| collection * | MongoDB Collection | Sets the name of the MongoDB collection to bind to this endpoint. | string | ||
| database * | MongoDB Database | Sets the name of the MongoDB database to target. | string | ||
| hosts * | MongoDB Hosts | Comma separated list of MongoDB Host Addresses in host:port format. | string | ||
| password * | MongoDB Password | User password for accessing MongoDB. | string | ||
| username * | MongoDB Username | Username for accessing MongoDB. The username must be present in the MongoDB’s authentication database (authenticationDatabase). By default, the MongoDB authenticationDatabase is 'admin'. | string | ||
| persistentTailTracking | MongoDB Persistent Tail Tracking | Enable persistent tail tracking, which is a mechanism to keep track of the last consumed message across system restarts. The next time the system is up, the endpoint will recover the cursor from the point where it last stopped slurping records. | boolean |
| |
| tailTrackIncreasingField | MongoDB Tail Track Increasing Field | Correlation field in the incoming record which is of increasing nature and will be used to position the tailing cursor every time it is generated. | string |
Fields marked with an asterisk (*) are mandatory.
39.2. Dependencies
At runtime, the mongodb-source Kamelet relies upon the presence of the following dependencies:
- camel:kamelet
- camel:mongodb
- camel:jackson
39.3. Usage
This section describes how you can use the mongodb-source.
39.3.1. Knative Source
You can use the mongodb-source Kamelet as a Knative source by binding it to a Knative object.
mongodb-source-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
name: mongodb-source-binding
spec:
source:
ref:
kind: Kamelet
apiVersion: camel.apache.org/v1alpha1
name: mongodb-source
properties:
collection: "The MongoDB Collection"
database: "The MongoDB Database"
hosts: "The MongoDB Hosts"
password: "The MongoDB Password"
username: "The MongoDB Username"
sink:
ref:
kind: Channel
apiVersion: messaging.knative.dev/v1
name: mychannel
39.3.1.1. Prerequisite
Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.
39.3.1.2. Procedure for using the cluster CLI
-
Save the
mongodb-source-binding.yamlfile to your local drive, and then edit it as needed for your configuration. Run the source by using the following command:
oc apply -f mongodb-source-binding.yaml
39.3.1.3. Procedure for using the Kamel CLI
Configure and run the source by using the following command:
kamel bind mongodb-source -p "source.collection=The MongoDB Collection" -p "source.database=The MongoDB Database" -p "source.hosts=The MongoDB Hosts" -p "source.password=The MongoDB Password" -p "source.username=The MongoDB Username" channel:mychannel
This command creates the KameletBinding in the current namespace on the cluster.
39.3.2. Kafka Source
You can use the mongodb-source Kamelet as a Kafka source by binding it to a Kafka topic.
mongodb-source-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
name: mongodb-source-binding
spec:
source:
ref:
kind: Kamelet
apiVersion: camel.apache.org/v1alpha1
name: mongodb-source
properties:
collection: "The MongoDB Collection"
database: "The MongoDB Database"
hosts: "The MongoDB Hosts"
password: "The MongoDB Password"
username: "The MongoDB Username"
sink:
ref:
kind: KafkaTopic
apiVersion: kafka.strimzi.io/v1beta1
name: my-topic
39.3.2.1. Prerequisites
Ensure that you’ve installed the AMQ Streams operator in your OpenShift cluster and created a topic named my-topic in the current namespace. Make also sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.
39.3.2.2. Procedure for using the cluster CLI
-
Save the
mongodb-source-binding.yamlfile to your local drive, and then edit it as needed for your configuration. Run the source by using the following command:
oc apply -f mongodb-source-binding.yaml
39.3.2.3. Procedure for using the Kamel CLI
Configure and run the source by using the following command:
kamel bind mongodb-source -p "source.collection=The MongoDB Collection" -p "source.database=The MongoDB Database" -p "source.hosts=The MongoDB Hosts" -p "source.password=The MongoDB Password" -p "source.username=The MongoDB Username" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic
This command creates the KameletBinding in the current namespace on the cluster.
