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Carbon logs in WSO2 DAS 

Carbon logs are configured in the log4j.properties file (stored in the <PRODUCT_HOME>/repository/conf directory) for all WSO2 products as explained in the admin guide. However, WSO2 DAS generates some additional Carbon logs that should be separately configured by creating a new log4j.properties file in the <DAS_HOME>/repository/conf/analytics/spark  directory. Note: To create this file, you need to rename the log4j.properties.template file that is available in the <DAS_HOME>/repository/conf/analytics/spark directory to log4j.properties.

The following sections explain how to configure and manage Spark worker logs. Each time we start a DAS server, a spark application will be created, and the relevant 'stderr' and 'stdout' logs can be found in each application folder inside the <DAS_HOME>/work directory. These spark logs are configured in the spark-defaults.conf file (stored in the <DAS_HOME>/repository/conf/analytics/spark directory).

Managing the size of spark log 

By default, a spark log will be a maximum of 10MBs in size. The maximum size of a log file and the number of executor logs can be controlled using the following two properties in the spark-defaults.conf file.

Code Block
spark.executor.logs.rolling.maxSize10000000
spark.executor.logs.rolling.maxRetainedFiles10

Removing logs in WSO2 DAS servers

Follow the guidelines given below for managing Spark logs in WSO2 DAS servers.

  • Delete old content from the <DAS-HOME>/work directory for non-running nodes of WSO2 DAS. Since new directories will be created each time we start the server, the previous data will be unusable after the restart.

  • When you delete index data from Spark logs, be sure to purge data stored in DAS, instead of deleting the data stored in the <DAS_HOME>/repository/data directory. Purging data using this method will remove the index data from the database as well as the /repository/data directory.