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https://issues.apache.org/jira/browse/SPARK-6435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376501#comment-14376501
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vijay commented on SPARK-6435:
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I came up with square brackets after 2 minutes of googling/stackoverflowing; a
more thorough search/understanding of bat scripts might result in a
better/different solution (I can rule myself out of the more thorough bat
script understanding). That being said, this test is used to check for an
empty string. Square brackets is the most upvoted solution:
http://stackoverflow.com/questions/2541767/what-is-the-proper-way-to-test-if-variable-is-empty-in-a-batch-file-if-not-1
> spark-shell --jars option does not add all jars to classpath
> ------------------------------------------------------------
>
> Key: SPARK-6435
> URL: https://issues.apache.org/jira/browse/SPARK-6435
> Project: Spark
> Issue Type: Bug
> Components: Spark Shell, Windows
> Affects Versions: 1.3.0
> Environment: Win64
> Reporter: vijay
>
> Not all jars supplied via the --jars option will be added to the driver (and
> presumably executor) classpath. The first jar(s) will be added, but not all.
> To reproduce this, just add a few jars (I tested 5) to the --jars option, and
> then try to import a class from the last jar. This fails. A simple
> reproducer:
> Create a bunch of dummy jars:
> jar cfM jar1.jar log.txt
> jar cfM jar2.jar log.txt
> jar cfM jar3.jar log.txt
> jar cfM jar4.jar log.txt
> Start the spark-shell with the dummy jars and guava at the end:
> %SPARK_HOME%\bin\spark-shell --master local --jars
> jar1.jar,jar2.jar,jar3.jar,jar4.jar,c:\code\lib\guava-14.0.1.jar
> In the shell, try importing from guava; you'll get an error:
> {code}
> scala> import com.google.common.base.Strings
> <console>:19: error: object Strings is not a member of package
> com.google.common.base
> import com.google.common.base.Strings
> ^
> {code}
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