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https://issues.apache.org/jira/browse/SPARK-4831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14242778#comment-14242778
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Sean Owen commented on SPARK-4831:
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Hm, so I made a quick test, where I put a class {{Foo.class}} inside
{{Foo.jar}} and then ran {{java -cp :otherstuff.jar Foo}}. It does not find the
class, which suggests to me that it does not interpret that empty entry as
meaning "local directory too".
It doesn't work even if I put "." on the classpath. That makes sense. The
working directory contains JARs, in your case, not classes.
However it finds it if I leave {{Foo.class}} in the working directory, *if* I
have an empty entry in the classpath. Is it perhaps finding and exploded
directory of classes? Otherwise, I can't repro this directly I suppose, in Java.
> Current directory always on classpath with spark-submit
> -------------------------------------------------------
>
> Key: SPARK-4831
> URL: https://issues.apache.org/jira/browse/SPARK-4831
> Project: Spark
> Issue Type: Bug
> Components: Deploy
> Affects Versions: 1.1.1, 1.2.0
> Reporter: Daniel Darabos
> Priority: Minor
>
> We had a situation where we were launching an application with spark-submit,
> and a file (play.plugins) was on the classpath twice, causing problems
> (trying to register plugins twice). Upon investigating how it got on the
> classpath twice, we found that it was present in one of our jars, and also in
> the current working directory. But the one in the current working directory
> should not be on the classpath. We never asked spark-submit to put the
> current directory on the classpath.
> I think this is caused by a line in
> [compute-classpath.sh|https://github.com/apache/spark/blob/v1.2.0-rc2/bin/compute-classpath.sh#L28]:
> {code}
> CLASSPATH="$SPARK_CLASSPATH:$SPARK_SUBMIT_CLASSPATH"
> {code}
> Now if SPARK_CLASSPATH is empty, the empty string is added to the classpath,
> which means the current working directory.
> We tried setting SPARK_CLASSPATH to a bogus value, but that is [not
> allowed|https://github.com/apache/spark/blob/v1.2.0-rc2/core/src/main/scala/org/apache/spark/SparkConf.scala#L312].
> What is the right solution? Only add SPARK_CLASSPATH if it's non-empty? I can
> send a pull request for that I think. Thanks!
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