Github user skonto commented on the pull request:
https://github.com/apache/spark/pull/8669#issuecomment-165048947
Its because Mesos Dispatcher passed that env variable to the driver at line:
builder.setEnvironment(envBuilder.build())
In 1.6 the spark-submit script has changed...
https://github.com/apache/spark/blob/master/bin/spark-submit
This line make SPARK_HOME not to change to the local path on mesos slave
because it has already been set.
if [ -z "${SPARK_HOME}" ]; then
export SPARK_HOME="$(cd "`dirname "$0"`"/..; pwd)"
fi
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