[jira] [Created] (SPARK-5189) Reorganize EC2 scripts so that nodes can be provisioned independent of Spark master

["Nicholas Chammas (JIRA)" <ji...@apache.org>]

Nicholas Chammas created SPARK-5189:
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             Summary: Reorganize EC2 scripts so that nodes can be provisioned independent of Spark master
                 Key: SPARK-5189
                 URL: https://issues.apache.org/jira/browse/SPARK-5189
             Project: Spark
          Issue Type: Improvement
          Components: EC2
            Reporter: Nicholas Chammas


As of 1.2.0, we launch Spark clusters on EC2 by setting up the master first, then setting up all the slaves together. This includes broadcasting files from the lonely master to potentially hundreds of slaves.

There are 2 main problems with this approach:
# Broadcasting files from the master to all slaves using [{{copy-dir}}|https://github.com/mesos/spark-ec2/blob/branch-1.3/copy-dir.sh] (e.g. during [ephemeral-hdfs init|https://github.com/mesos/spark-ec2/blob/3a95101c70e6892a8a48cc54094adaed1458487a/ephemeral-hdfs/init.sh#L36], or during [Spark setup|https://github.com/mesos/spark-ec2/blob/3a95101c70e6892a8a48cc54094adaed1458487a/spark/setup.sh#L3]) takes a long time. This time increases as the number of slaves increases.
# It's more complicated to add slaves to an existing cluster (a la [SPARK-2008]), since slaves are only configured through the master during the setup of the master itself.

Logically, the operations we want to implement are:

* Provision a Spark node
* Join a node to a cluster (including an empty cluster) as either a master or a slave
* Remove a node from a cluster

We need our scripts to roughly be organized to match the above operations. The goals would be:
# When launching a cluster, enable all cluster nodes to be provisioned in parallel, removing the master-to-slave file broadcast bottleneck.
# Facilitate cluster modifications like adding or removing nodes.
# Enable exploration of infrastructure tools like [Terraform|https://www.terraform.io/] that might simplify {{spark-ec2}} internals and perhaps even allow us to build [one tool that launches Spark clusters on several different cloud platforms|https://groups.google.com/forum/#!topic/terraform-tool/eD23GLLkfDw].

More concretely, the modifications we need to make are:
* Replace all occurrences of {{copy-dir}} or {{rsync}}-to-slaves with equivalent, slave-side operations.
* Repurpose {{setup-slave.sh}} as {{provision-spark-node.sh}} and make sure it fully creates a node that can be used as either a master or slave.
* Create a new script, {{join-to-cluster.sh}}, that takes a provisioned node, configures it as a master or slave, and joins it to a cluster.
* Move any remaining logic in {{setup.sh}} up to {{spark_ec2.py}} and delete that script.



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