Connecting Solr to Spark - Apache Zeppelin Notebook

[#1]

This article is designed to extend the great work by @Ali Bajwa: Sample HDF/NiFi flow to Push Tweets into Solr/Banana, HDFS/Hive

I have included the complete notebook on my Github site, which can be found here

Step 1 - Follow Ali's tutorial to establish an Apache Solr collection called "tweets"

Step 2 - Verify the version of Apache Spark being used, and visit the Solr-Spark connector site. The key is to match the version of Spark the version of the Solr-Spark connector. In the example below, the version of Spark is 2.2.0, and the connector version is 3.4.4

%spark2
sc
sc.version
 
res0: org.apache.spark.SparkContext = org.apache.spark.SparkContext@617d134a
res1: String = 2.2.0.2.6.4.0-91

Step 3 - Include the Solr-Spark dependency in Zeppelin. Important note: This needs to be run before the Spark Context has been initialized.

%dep
z.load("com.lucidworks.spark:spark-solr:jar:3.4.4")
//Must be used before SparkInterpreter (%spark2) initialized
//Hint: put this paragraph before any Spark code and restart Zeppelin/Interpreter

Step 4 - Run Solr query and return results into Spark DataFrame. Note: Zookeeper host might need to use full names:

"zkhost" -> "host-1.domain.com:2181,host-2.domain.com:2181,host-3.domain.com:2181/solr",

%spark2
val options = Map(
  "collection" -> "Tweets",
  "zkhost" -> "localhost:2181/solr",
//   "query" -> "Keyword, 'More Keywords'"
)

val df = spark.read.format("solr").options(options).load
df.cache()

Step 5 - Review results of the Solr query

%spark2 
df.count()
df.printSchema()
df.take(1)