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https://issues.apache.org/jira/browse/SPARK-2960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15003555#comment-15003555
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Xusen Yin commented on SPARK-2960:
----------------------------------

Here we use the SPARK_HOME in those shell scripts may cause confusion. If users 
have already set up a SPARK_HOME to another dir, the bin/spark_shell script 
will use the libs in that dir, other than the current one. I think we'd better 
add a warning message for users who have another SPARK_HOME setting. Especially 
when the two spark directories are not the same version, there will be errors.

> Spark executables fail to start via symlinks
> --------------------------------------------
>
>                 Key: SPARK-2960
>                 URL: https://issues.apache.org/jira/browse/SPARK-2960
>             Project: Spark
>          Issue Type: Bug
>          Components: Deploy
>            Reporter: Shay Rojansky
>            Assignee: Saisai Shao
>            Priority: Minor
>             Fix For: 1.6.0
>
>
> The current scripts (e.g. pyspark) fail to run when they are executed via 
> symlinks. A common Linux scenario would be to have Spark installed somewhere 
> (e.g. /opt) and have a symlink to it in /usr/bin.



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