Configuring Spark logging options

Configure Spark logging options.

You can configure Spark logging options for the Spark logs.

logback.xml

The location of the logback.xml file depends on the type of installation:
Package installations /etc/dse/cassandra/logback.xml
Tarball installations installation_location/resources/cassandra/conf/logback.xml

Log directories

The Spark logging directory is the directory where the Spark components store individual log files. DataStax Enterprise places logs in the following locations:
Executor logs
  • SPARK_WORKER_DIR/worker-n/application_id/executor_id/stderr
  • SPARK_WORKER_DIR/worker-n/application_id/executor_id/stdout
Spark Master/Worker logs
Spark Master: the global system.log
Spark Worker: SPARK_WORKER_LOG_DIR/worker-n/worker.log

The default SPARK_WORKER_LOG_DIR location is /var/log/spark/worker.

Default log directory for Spark SQL Thrift server
The default log directory for starting the Spark SQL Thrift server is $HOME/spark-thrift-server.
Spark Shell and application logs
Spark Shell and application logs are output to the console.
SparkR shell log
The default location for the SparkR shell is $HOME/.sparkR.log
Log configuration file
Log configuration files are located in the same directory as spark-env.sh.

Procedure

To configure Spark logging options:

  1. Configure logging options, such as log levels, in the following files:
    OptionDescription
    Executors logback-spark-executor.xml
    Spark Master logback.xml
    Spark Worker logback-spark-server.xml
    Spark Driver (Spark Shell, Spark applications) logback-spark.xml
    SparkR logback-sparkR.xml
  2. If you want to enable rolling logging for Spark executors, add the following options to spark-daemon-defaults.conf.

    Enable rolling logging with 3 log files retained before deletion. The log files are broken up by size with a maximum size of 50,000 bytes.

    spark.executor.logs.rolling.maxRetainedFiles 3
    spark.executor.logs.rolling.strategy size
    spark.executor.logs.rolling.maxSize 50000
    The default location of the Spark configuration files depends on the type of installation:
    • Package installations: /etc/dse/spark/
    • Tarball installations: installation_location/resources/spark/conf
  3. Configure a safe communication channel to access the Spark user interface.
    Note: When user credentials are specified in plain text on the dse command line, like dse -u username -p password, the credentials are present in the logs of Spark workers when the driver is run in cluster mode.

    The Spark Master, Spark Worker, executor, and driver logs might include sensitive information. Sensitive information includes passwords and digest authentication tokens for Kerberos guidelines mode that are passed in the command line or Spark configuration. DataStax recommends using only safe communication channels like VPN and SSH to access the Spark user interface.

    Tip: You can provide authentication credentials in several ways, see Credentials for authentication.