Telemetry Service

Telemetry Service is a highly scalable micro service which allows various components in the Sunbird platform to send the event level data generated from various activities in the platform. These event level data could be either from clients such as the user apps or from micro services such as Sunbird Lern.

Key Features:

1. Horizontally Scalable: The service can be scaled horizontally to handle increase in Telemetry data traffic as the operations are idempotent.
2. Configurable storage: The service supports disk storage, Apache Kafka, Apache Cassandra as data storage.
3. In-built compression: Efficient use of network bandwidth by compressing the messages sent to the data storage.

Installation Configuration Reference:

Property	Description	Default
localStorageEnabled	A boolean flag to enable on disk storage	true
dispatcher	Supported dispatchers are kafka, cassandra, file and console	console
kafkaHost	Host or IP address of the Kafka broker servers	none
topic	The kafka topic to which telemetry data will be pushed to	none
compression_type	Type of compression to use if kafka dispatcher is chosen. Possible values are none, gzip and snappy	none
filename	The name of the file to write data to if file dispatcher is chosen	telemetry-%DATE%.log
maxSize	Roll over max size for file based dispatched	100 Mb
maxFiles	Max files to keep for a file based dispatcher	100
partitionBy	Time based partitioning key for a Cassandra dispatcher	hour
keyspace	Keyspace name for a Cassandra dispatcher	none
cassandraTtl	TTL for retention of data for a Cassandra dispatcher	none
threads	Number of cpu threads to be used by the service	Default number of cpus on the machine

Note

Telemetry documentation telemetry.sunbird.org

Source Code