GridGain Developers Hub

Configuring Logging

Overview

GridGain supports a number of logging libraries and frameworks:

  • JUL (default),

  • Log4j,

  • Log4j2,

  • JCL,

  • SLF4J.

This section shows you how to set up the logger.

When a node starts, it outputs start-up information to the console, including the information about the configured logging library. Each logging library has its own configuration parameters and should be set up according to its official documentation. Besides library-specific configuration, there is a number of system properties that allow you to tune logging. These properties are presented in the following table.

System Property Description Default Value

IGNITE_LOG_INSTANCE_NAME

If the property is set, GridGain includes its instance name in log messages.

Not set

IGNITE_QUIET

Set to false to disable the quiet mode and enable the verbose mode. In the verbose mode, the node logs a lot more information.

true

IGNITE_LOG_DIR

The directory where GridGain writes log files.

$IGNITE_HOME/ work/log

IGNITE_DUMP_THREADS_ON_FAILURE

Set to true to output thread dumps to the log when a critical error is caught.

true

Default Logging

By default, GridGain uses the java.util.logging (JUL) framework. If you start GridGain using the ignite.sh|bat script from the distribution package, GridGain uses $IGNITE_HOME/config/java.util.logging.properties as the default logging configuration file and output all messages to log files in the $IGNITE_HOME/work/log directory. You can override the default logging directory by specifying the IGNITE_LOG_DIR system property.

If you use GridGain as a library in your application, the default logging configuration includes only console handler at INFO level. You can provide a custom configuration file via the java.util.logging.config.file system property.

Using Log4j

To enable Log4j logger, set the gridLogger property of IgniteConfiguration, as shown in the following example:

<bean class="org.apache.ignite.configuration.IgniteConfiguration" id="ignite.cfg">
    <property name="gridLogger">
        <bean class="org.apache.ignite.logger.log4j.Log4JLogger">
            <!-- log4j configuration file -->
            <constructor-arg type="java.lang.String" value="log4j-config.xml"/>
        </bean>
    </property>

    <!-- other properties -->

</bean>
IgniteConfiguration cfg = new IgniteConfiguration();

IgniteLogger log = new Log4JLogger("log4j-config.xml");

cfg.setGridLogger(log);

// Start a node.
try (Ignite ignite = Ignition.start(cfg)) {
    ignite.log().info("Info Message Logged!");
}
This API is not presently available for .NET. You can use XML configuration.
This API is not presently available for C++. You can use XML configuration.

In the above example, the path to log4j-config.xml can be either an absolute path, a local path relative to META-INF in classpath or to IGNITE_HOME. An example log4j configuration file can be found in the distribution package ($IGNITE_HOME/config/ignite-log4j.xml).

Using Log4j2

To enable Log4j2 logger, set the gridLogger property of IgniteConfiguration, as shown below:

<bean class="org.apache.ignite.configuration.IgniteConfiguration" id="ignite.cfg">
    <property name="gridLogger">
        <bean class="org.apache.ignite.logger.log4j2.Log4J2Logger">
            <!-- log4j2 configuration file -->
            <constructor-arg type="java.lang.String" value="log4j2-config.xml"/>
        </bean>
    </property>

    <!-- other properties -->

</bean>
IgniteConfiguration cfg = new IgniteConfiguration();

IgniteLogger log = new Log4J2Logger("log4j2-config.xml");

cfg.setGridLogger(log);

// Start a node.
try (Ignite ignite = Ignition.start(cfg)) {
    ignite.log().info("Info Message Logged!");
}
This API is not presently available for .NET. You can use XML configuration.
This API is not presently available for C++. You can use XML configuration.

In the above example, the path to log4j2-config.xml can be either an absolute path, a local path relative to META-INF in classpath or to IGNITE_HOME. An example log4j2 configuration file can be found in the distribution package ($IGNITE_HOME/config/ignite-log4j2.xml).

Using JCL

To enable Log4j2 logger, set the gridLogger property of IgniteConfiguration, as shown below:

<bean class="org.apache.ignite.configuration.IgniteConfiguration" id="ignite.cfg">
    <property name="gridLogger">
        <bean class="org.apache.ignite.logger.jcl.JclLogger">
        </bean>
    </property>

    <!-- other properties -->

</bean>
IgniteConfiguration cfg = new IgniteConfiguration();

cfg.setGridLogger(new JclLogger());

// Start a node.
try (Ignite ignite = Ignition.start(cfg)) {
    ignite.log().info("Info Message Logged!");
}
This API is not presently available for .NET. You can use XML configuration.
This API is not presently available for C++. You can use XML configuration.

Using SLF4J

To enable the SLF4J logger, set the gridLogger property of IgniteConfiguration, as shown below:

<bean class="org.apache.ignite.configuration.IgniteConfiguration" id="ignite.cfg">
    <property name="gridLogger">
        <bean class="org.apache.ignite.logger.slf4j.Slf4jLogger">
        </bean>
    </property>

    <!-- other properties -->

</bean>
IgniteConfiguration cfg = new IgniteConfiguration();

cfg.setGridLogger(new Slf4jLogger());

// Start a node.
try (Ignite ignite = Ignition.start(cfg)) {
    ignite.log().info("Info Message Logged!");
}
This API is not presently available for .NET. You can use XML configuration.
This API is not presently available for C++. You can use XML configuration.

Refer to the SLF4J user manual for more information.

Suppressing Sensitive Information

Logs can include the content of cache entries, system properties, startup options, etc. In some cases, those can contain sensitive information. You can prevent such information from being written to the log by setting the IGNITE_TO_STRING_INCLUDE_SENSITIVE system property to false.

./ignite.sh -J-DIGNITE_TO_STRING_INCLUDE_SENSITIVE=false

See Setting JVM Options to learn about different ways to set system properties.

Logging Configuration Example

The following steps guide you through the process of configuring logging. This should be suitable for most cases.

  1. Use either Log4j or Log4j2 as the logging framework. To enable it, follow the instructions provided in the corresponding section above.

  2. If you use the default configuration file (either ignite-log4j.xml or ignite-log4j2.xml), uncomment the CONSOLE appender.

  3. In the log4j configuration file, set the path to the log file. The default location is ${IGNITE_HOME}/work/log/ignite.log.

  4. Start the nodes in verbose mode:

    • If you use ignite.sh to start nodes, specify the -v option.

    • If you start nodes from Java code, use the IGNITE_QUIET=false system variable.