There is one capture engine per database.
In most cases, the program that reads the transaction logs in Talend Change Data Capture journals is called the LogReader. It is executed by the Universal program.
With AS400/IBMi source database, the LogReader runs on the AS/400 IBMi machine, next to the source database. Only log-based reading mode is possible. There is no need to define a directory path for journalization.
With other source database types, the LogReader runs on the source engine machine only. Log-based or trigger-based modes are possible. Defining a directory path for journalization is needed.