Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/12678#issuecomment-215241450
first is com.exeample.CustomSparkSerializer spelled correctly? or did you
typo the name.
what kind of file is com.exeample.CustomSparkSerializer in (I assume a jar
but please confirm)? the --files/--jars get downloaded before any container is
launched. The classpath is set to include $PWD before its launched. If the
jar/file is there that it will be in the classpath when spark is launched
executor is launched. its possible there is something goofy going on but can
you verify your YARN env? Do you have access to the nodemanagers? If so go to
the nodemanager and check that the files properly got downloaded and the launch
script has the correct classpath set.
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