Out of memory exception

[vishal-bihani]

Describe the bug
When connector is deployed to read from topics that contains large amounts of record, after some time the connector throws out of memory exception.

Cause
Kafka connect consumer thread keeps on consuming records from the Kafka when connector is busy processing the records in buffer. This leads to Kafka connect running out of memory.

Expected behavior
When the connector starts processing the records in the buffer, it should pause consuming records from the Kafka topic, only once the processing is complete it should resume the consumer.