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Version: 2.14

Logging

Apache Flink® clusters have a default Apache Log4j® configuration. It is possible to customize the generated logging configuration as described on this page.

Loggers​

You can configure log levels for individual loggers via the log4jLoggers attribute:

kind: SessionCluster
spec:
  logging:
    log4jLoggers:
      "": INFO            # Root log level
      com.company: DEBUG  # Log level of com.company
note

The root log level is configured by using the empty string "" as key.

Logging Profile​

Logging profiles are Log4j configuration templates pre-configured by the Ververica Platform administrator. A profile named default is always available.

kind: SessionCluster
spec:
  logging:
    loggingProfile: default

In general, you should expect the Ververica Platform administrator to set up the default logging profile as required by your environment.

Please consult the Logging & Metrics documentation for more details on how to configure logging profiles.

Log4j Template (Advanced)​

The Log4j configuration template gives you full control over the Apache Log4j® configuration of your Flink cluster if the logging profile does not provide enough flexibility.

kind: SessionCluster
spec:
  logging:
    log4j2ConfigurationTemplate: |
      <?xml version="1.0" encoding="UTF-8" standalone="no"?>
      <Configuration xmlns="http://logging.apache.org/log4j/2.0/config" strict="true">
      ...
      </Configuration>

Custom Log4j templates follow the XML configuration format of Log4j and have higher precedence than a configured profile.

Please consult the Logging & Metrics documentation for more details on how to configure Log4j templates.