Prashant Sharma created SPARK-30985:
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Summary: Propagate SPARK_CONF_DIR files to driver and exec pods.
Key: SPARK-30985
URL: https://issues.apache.org/jira/browse/SPARK-30985
Project: Spark
Issue Type: Improvement
Components: Kubernetes
Affects Versions: 3.0.0
Reporter: Prashant Sharma
Assignee: Prashant Sharma
SPARK_CONF_DIR hosts configuration files like,
1) spark-defaults.conf - containing all the spark properties.
2) log4j.properties - Logger configuration.
3) spark-env.sh - Environment variables to be setup at driver and executor.
4) core-site.xml - Hadoop related configuration.
5) fairscheduler.xml - Spark's fair scheduling policy at the job level.
6) metrics.properties - Spark metrics.
7) Any user specific - library or framework specific configuration file.
Traditionally, SPARK_CONF_DIR has been the home to all user specific
configuration files and the default behaviour in the Yarn or standalone mode is
that these configuration files are copied to the worker nodes as required by
the users themselves. In other words, they are not auto-copied.
But, in the case of spark on kubernetes, we use spark images and generally
these images are approved or undergoe some kind of standardisation. These files
cannot be simply copied to the SPARK_CONF_DIR of the running executor and
driver pods by the user.
So, at the moment we have special casing for providing each configuration and
for any other user specific configuration files, the process is more complex,
i.e. - e.g. one can start with their own custom image of spark with
configuration files pre installed etc..
Examples of special casing are:
1. Hadoop configuration in spark.kubernetes.hadoop.configMapName
2. Spark-env.sh as in spark.kubernetes.driverEnv.[EnvironmentVariableName]
3. Log4j.properties as in https://github.com/apache/spark/pull/26193
... And for those such special casing does not exist, they are simply out of
luck.
So this feature, will let the user specific configuration files be mounted on
the driver and executor pods' SPARK_CONF_DIR.
At the moment it is not clear, if there is a need to, let user specify which
config files to propagate - to driver and or executor. But, if there is a case
that feature will be helpful, we can increase the scope of this work or create
another JIRA issue to track that work.
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