Log levels determine the importance of information contained in a log file. You can configure log levels for some files.
Important: Using a higher log levels than the default levels may result in loss of performance.
Different log levels provide different content:
- For index engines and crawlers, log levels include the C++ side.
- E3 and E4 C++ log entries are written directly into the log files.
- E1 and E2 exceptions are handed over to the Java side and marked as a CPP exception.
| Level name | Log level | Property Description |
|---|---|---|
| Off | no logging | |
| fatal | E1 |
Logs fatal errors only. Messages up to [E1] are logged. |
| error | E2 | Logs all errors and fatal errors. Messages up to [E2] are logged. |
| warn | E3 |
Logs all information about possible issues. Messages up to [E3] are logged. This level is the standard level for all appenders (components that write log messages to files or the user interface). Use this log level for systems in operation. |
| info |
I1 - I4 |
Logs all information in detail. All error and information messages up to [I3 or I4] are logged by default. (See also Changing Log Levels for Engines and Data Sources .) |
| debug | I5 | Logs all information in great detail. All messages up to level 5 are logged. This level is only used for developer debugging and may significantly impact performance. |
| all | All messages. |