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https://issues.apache.org/jira/browse/SPARK-2008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153770#comment-14153770
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Shivaram Venkataraman commented on SPARK-2008:
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This will be a very useful feature for spark-ec2 and is a good issue to work
on. I think removing slaves should be relatively easy to implement as systems
like HDFS, Spark should be resistant to slaves being removed.
For adding slaves we'll need a new script that'll run setup-slave.sh
https://github.com/mesos/spark-ec2/blob/v3/setup-slave.sh and bring up
Datanodes, Spark workers etc.
> Enhance spark-ec2 to be able to add and remove slaves to an existing cluster
> ----------------------------------------------------------------------------
>
> Key: SPARK-2008
> URL: https://issues.apache.org/jira/browse/SPARK-2008
> Project: Spark
> Issue Type: New Feature
> Components: EC2
> Affects Versions: 1.0.0
> Reporter: Nicholas Chammas
> Priority: Minor
>
> Per [the discussion
> here|http://apache-spark-user-list.1001560.n3.nabble.com/Having-spark-ec2-join-new-slaves-to-existing-cluster-td3783.html]:
> {quote}
> I would like to be able to use spark-ec2 to launch new slaves and add them to
> an existing, running cluster. Similarly, I would also like to remove slaves
> from an existing cluster.
> Use cases include:
> * Oh snap, I sized my cluster incorrectly. Let me add/remove some slaves.
> * During scheduled batch processing, I want to add some new slaves, perhaps
> on spot instances. When that processing is done, I want to kill them. (Cruel,
> I know.)
> I gather this is not possible at the moment. spark-ec2 appears to be able to
> launch new slaves for an existing cluster only if the master is stopped. I
> also do not see any ability to remove slaves from a cluster.
> {quote}
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