ASF GitHub Bot commented on NIFI-4683:

Github user mattyb149 commented on the issue:

    @jomach Does Livy support client-side Kerberos authentication? I thought 
the Livy Kerberos stuff was a config on the Livy server side to connect to a 
Kerberized Hadoop cluster?

> 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
>            Assignee: Matt Burgess
>            Priority: Major
>             Fix For: 1.5.0
> 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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