[ZEPPELIN-1395] Local or Remote Interpreter by Configuration

[echarles]

What is this PR for?

The current remote interpreter (launched via shell) is scalable and open but suffers from 2 limitations:

• It does not allow to easily debug in the IDE.
• It does not allow to embedd Zeppelin (for small deployements) in a single jar.

A configuration per interpreter "Remote Interpreter" (true/false, true by default) is proposed.
An additional property zeppeline.interpreter.remote' in zeppelin-site.xml is also proposed (a new interpreter will be created with that value for itoption.remote` attribute).

What type of PR is it?

[Improvement]

Todos

• - Value defined in zeppelin-site.xml is not honored when creating a new interepreter
• - Unit Test
• - Documentatoin

What is the Jira issue?

• https://issues.apache.org/jira/browse/ZEPPELIN-1395

How should this be tested?

Load Zeppelin source in your IDE and start ZeppelinServer in debug mode
Put breakpoints in the interpreter sources, Set / Uset the "Remote Interpeter (see screeenshot).

Screenshots (if appropriate)

Questions:

• Does the licenses files need update? N
• Is there breaking changes for older versions? N
• Does this needs documentation? Y

[jongyoul]

ZeppelinConfiguration has a factory method, thus you don't have to pass it by parameter and you can use ZeppelinConfiguration.create()

[astroshim]

Please fix the CI-fails.

[INFO] There are 5 checkstyle errors.
[ERROR] InterpreterFactory.java[302] (sizes) LineLength: Line is longer than 100 characters (found 106).
[ERROR] InterpreterFactory.java[327] (sizes) LineLength: Line is longer than 100 characters (found 106).
[ERROR] InterpreterFactory.java[330] (indentation) Indentation: method def child at indentation level 6 not at correct indentation, 4
[ERROR] InterpreterFactory.java[332] (indentation) Indentation: for at indentation level 6 not at correct indentation, 4
[ERROR] InterpreterFactory.java[345] (sizes) LineLength: Line is longer than 100 characters (found 116).

[echarles]

@astroshim Thx for the review. I have pushed a fix.

[echarles]

@jongyoulZeppelinConfiguration.create() is now used and method signature are now like before.

[jongyoul]

It remains ZeppelinConfiguration. Could you check it again?

[echarles]

@jongyoul ZeppelinConfiguration is now also removed on that method.