bin/interpreter.sh overwrites spark-defaults.conf/spark.driver.extraJavaOptions

In

zeppelin/bin/interpreter.sh

the following line starts the spark interpreter if spark-submit is available

INTERPRETER_RUN_COMMAND+=' '` echo ${SPARK_SUBMIT} --class ${ZEPPELIN_SERVER} --driver-class-path \"${ZEPPELIN_INTP_CLASSPATH_OVERRIDES}:${ZEPPELIN_INTP_CLASSPATH}\" --driver-java-options \"${JAVA_INTP_OPTS}\" ${SPARK_SUBMIT_OPTIONS} ${ZEPPELIN_SPARK_CONF} ${SPARK_APP_JAR} ${CALLBACK_HOST} ${PORT} ${INTP_GROUP_ID} ${INTP_PORT}`

where you can see that --driver-java-options is only depending on JAVA_INTP_OPTS and indeed will overwrite any spark.driver.extraJavaOptions if they had been specified in the spark-defaults.conf file

This breaks the interoperability of spark-properties files and demands specific handling of Zeppelin everywhere. Hence I guess this behaviour is unintended.