Configuring Logback Logging

The default Logback logging configuration file is located in /etc/oracle/graph/logback-server.xml. This configuration file contains the target location for the logs in /var/log/oracle/graph/. Additionally, the rolling file appenders are also defined in this configuration file.

Note:

Logback is configured to roll the log files based on both log size (250 MB) and date.
Log files are automatically saved in a compressed format in subdirectories, one directory per month. There can be multiple files on a given day.
Also, each startup of the graph server(PGX) triggers a new log file.

The Logback configuration file is picked up automatically by the the graph server(PGX). To use this configuration in your java application, you can set the logback.configurationFile system variable when launching the JVM:

java -Dlogback.configurationFile=$PGX_HOME/conf/logback.xml ...

Changing Logging Level During a JShell Session

When connected to the graph server using JShell, you can use the loglevel(String loggerName, String levelName) function to quickly change the logging level of any logger. For example:

loglevel("oracle.pgx", "debug")
loglevel("ROOT", "info")
loglevel("org.apache.hadoop", "off")

Logging in a Web Application Server

The graph-server-<version>-pgx<version>.war file in the oracle-graph-webapps-<version>.zip download package contains the logback.xml. This file determines what should be logged in the web application running on the application server of your choice. The file is located in the folder WEB-INF/classes inside the graph-server-<version>-pgx<version>.war file. By default, only errors are logged. But you can change this file if you want more logging in your web server. You must restart the web server after you change the file, for the change to take effect.