[jira] [Created] (NIFI-4683) Add ability to execute Spark jobs via Livy

["Matt Burgess (JIRA)" <ji...@apache.org>]

Matt Burgess created NIFI-4683:
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             Summary: Add ability to execute Spark jobs via Livy
                 Key: NIFI-4683
                 URL: https://issues.apache.org/jira/browse/NIFI-4683
             Project: Apache NiFi
          Issue Type: New Feature
          Components: Extensions
            Reporter: Matt Burgess


Proposal for a new feature to enable NiFi users to execute Spark jobs. A natural entry point for this is to use Apache Livy, as it is a "REST service for Apache Spark". This would allow NiFi to submit Spark jobs without needing to bundle a Spark client itself (and maintain versions of Spark, e.g.).

Some of the components that could be involved include:

LivySessionController Controller Service (CS) - provides connections to available sessions in Livy
* Users could request a type of connection or to retrieve the same connection back by session id if available.
* Properties to configure Livy session such as number of executors, memory
* Property for connection pool size
* Will interact with Livy ensure that only connections that are idle/available are added to the pool and checked back in
* Key for pool could be based on session id or type
* Ensure to provide any user credentials
* Leverages SSLContext for security


LivyProcessor
* Obtains Spark JARs/files via properties and/or flow file attribute(s)
* Obtains connection information from LivySessionController
* Provides attributes to configure session, maintain session id, attach to session id
* Potential advanced UI available for testing code (probably a follow-on Jira)



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