The Platform loader controller (plc) controls the data loaders that gather data from the system and writes the data into the relational database containing raw data.
There are logging levels that determine the detail of messages that the PERF services record in the log files. In decreasing level of detail, these levels are ALL (all messages), TRACE, DEBUG, INFO, WARN, ERROR, FATAL, and OFF (no messages).
By default, the PERF services log messages of INFO level or higher (that is, all INFO, WARN, ERROR, and FATAL messages).
The loader controller log file is located in the log directory:
The loader controller service controls the scheduling of the data loaders. Sampling and retrieving data loaders request cluster operation data from the data tables through the node data sources while other data loaders obtain it directly from the data tables through the node data sources. The data loaders store this data into data tables through the node data sources. Each data loader contains data that is stored in specific data tables in the database.
The following diagram illustrates the interaction between the loader controller and other components.