[Zeppelin-1090][Hot Fix] LivySparkSQLInterpreter doesn't work in FIFO.

[prabhjyotsingh]

What is this PR for?

LivySparkSQLInterpreter should work in FIFO with LivySparkInterpreter just like SparkSqlInterpreter works with SparkInterpreter

What type of PR is it?

[Hot Fix]

Todos

• - LivySparkSQLInterpreter should work in FIFO just like SparkSqlInterpreter
• - add in property file zeppelin.livy.concurrentSQL

What is the Jira issue?

• Zeppelin-1090

How should this be tested?

In a notebook create 2 paragraph make content of first as

%livy
Thread.sleep(10000)

and other as

%livy.sql
show tables

The second paragraph should not get executed before first.

Screenshots (if appropriate)

Questions:

• Does the licenses files need update? n/a
• Is there breaking changes for older versions? n/a
• Does this needs documentation? n/a

[prabhjyotsingh]

@bzz CI still fails #1094

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running org.apache.zeppelin.python.PythonInterpreterTest
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/travis/build/apache/zeppelin/zeppelin-interpreter/target/zeppelin-interpreter-0.6.0-SNAPSHOT.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/travis/build/apache/zeppelin/zeppelin-interpreter/target/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/travis/.m2/repository/org/slf4j/slf4j-log4j12/1.7.10/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
log4j:WARN No appenders could be found for logger (org.apache.zeppelin.interpreter.Interpreter).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Tests run: 5, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.424 sec <<< FAILURE! - in org.apache.zeppelin.python.PythonInterpreterTest
testClose(org.apache.zeppelin.python.PythonInterpreterTest)  Time elapsed: 0.319 sec  <<< FAILURE!
java.lang.AssertionError: null
    at org.junit.Assert.fail(Assert.java:86)
    at org.junit.Assert.assertTrue(Assert.java:41)
    at org.junit.Assert.assertFalse(Assert.java:64)
    at org.junit.Assert.assertFalse(Assert.java:74)
    at org.apache.zeppelin.python.PythonInterpreterTest.testClose(PythonInterpreterTest.java:141)


Results :

Failed tests: 
  PythonInterpreterTest.testClose:141 null

https://api.travis-ci.org/jobs/141302291/log.txt?deansi=true

[r-kamath]

Thanks for the fix. LGTM

[prabhjyotsingh]

Merging this if no more discussion.