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https://issues.apache.org/jira/browse/SPARK-4977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-4977.
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Resolution: Won't Fix
> spark-ec2 start resets all the spark/conf configurations
> --------------------------------------------------------
>
> Key: SPARK-4977
> URL: https://issues.apache.org/jira/browse/SPARK-4977
> Project: Spark
> Issue Type: Bug
> Components: EC2
> Affects Versions: 1.2.0
> Reporter: Noah Young
> Priority: Minor
>
> Running `spark-ec2 start` to restart an already-launched cluster causes the
> cluster setup scripts to be run, which reset any existing spark configuration
> files on the remote machines. The expected behavior is that all the modules
> (tachyon, hadoop, spark itself) should be restarted, and perhaps the master
> configuration copy-dir'd out, but anything in spark/conf should (at least
> optionally) be left alone.
> As far as I know, one must create and execute their own init script to set
> all spark configurables as needed after restarting a cluster.
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