Week 8: Spark MLlib, Spark NLP

DSAN 6000: Big Data and Cloud Computing
Fall 2026

Jeff Jacobs

jj1088@georgetown.edu

Monday, October 26, 2026

Today’s Agenda: Demos! And More Demos!

• Spark DataFrames
• MLlib: Official Spark library!
• SparkNLP: 3rd-Party Library

Spark DataFrame

…Yet another type of DataFrame!

Pandas

• Everything in RAM
• All computations eagerly executed

data_df['price'].mean()

Polars: Introduced lazy execution

• \(\leadsto\) separation of computation from data
• Optimized for multicore computation

ratio_expr = (
  pl.col('work_hrs') / pl.col('sleep_hrs')
).alias('sleep_ratio')
data_pl.with_columns(ratio_expr).collect()

PySpark

data_sdf = spark.createDataFrame([
    [1, 2.0, 's1', date(2000, 1, 1), datetime(2000, 1, 1, 12, 0)],
    [2, 3.0, 's2', date(2000, 3, 1), datetime(2000, 1, 3, 12, 0)],
], schema='a long, b double, c string, d date, e timestamp')
data_sdf

• Optimized for distributed computation \(\leadsto\) requires an always-running process
• Wrapper around RDD (Resilient Distributed Dataset): data_sdf.rdd.getNumPartitions()

In-Class Demo 1: Local Spark

(For development, can just pip install pyspark!)

 

PySpark Basics

First Things First: OpenJDK

• Spark 4: Recommended JDK version = 21
  • (How would you know without me telling you? Truly idk)

  sudo apt install openjdk-21-jdk-headless

• Install this on the master node and on all worker nodes that you’d like to link together
  • (Run sudo apt update first if on a new instance!)

Getting + Using Spark

Apache Spark Downloads Page

• Click through the “Download Spark” link…

• …To get the actual download URL 😵‍💫

• Use wget <url> in terminal to download .tar.gz:

  wget https://dlcdn.apache.org/spark/spark-4.2.0/spark-4.2.0-bin-hadoop3.tgz

• Extract using:

  tar -xzvf spark-4.2.0-bin-hadoop3.tgz

In-Class Demo 2: Your First Spark Cluster!

Spark Cluster Checklist:

AWS Console → EC2 Console → Security group (launch-wizard-1):

• Edit inbound rules → Add rule → Type=“All traffic” → Source=itself (sg… autocomplete)

Master node:

• Created

• JDK 21 installed: sudo apt install openjdk-21-jdk-headless

• Spark 4.2.0 downloaded, extracted

• Private IP recorded:

  export PRIVATE_IP=$(hostname -I | awk '{print $1}')

• start-master.sh -h <Private IP>

Worker nodes (one at a time):

• Created with existing security group launch-wizard-1
• sudo apt update
• JDK 21 installed: sudo apt install openjdk-21-jdk-headless
• Spark 4.2.0 downloaded, extracted
• start-worker.sh <Private IP>:7077

Check status via Spark UI: Master on localhost:8080 (VSCode port forwarding)
(New worker nodes should appear after each start-worker.sh)

Now Use It From a Jupyter Notebook

from pyspark.sql import SparkSession
spark = (
  SparkSession
    .builder
    .appName('UNSC_Speeches')
    .master('spark://<Private IP Here!>:7077')
    .config('spark.jars.packages','org.apache.hadoop:hadoop-aws:3.5.0')
    .getOrCreate()
)

Check status of SparkSession via Spark Session UI: localhost:4040

• Master node UI: localhost:8080 (worker UI=localhost:8081)
• SparkSession UI: localhost:4040
• Confusion ↓, Understanding ↑ 🥳

MLlib: Hopping Up Another Abstraction Layer!

Image Source

In-Class Demo 3

 

MLlib in Action

Spark NLP

MLlib: pyspark as normal:

from pyspark.sql import SparkSession
spark = (
    SparkSession
    .builder
    .appName('SF_Housing')
    .getOrCreate()
)
type(spark)
# >>> pyspark.sql.session.SparkSession
from pyspark.ml.feature import VectorAssembler

Spark NLP: Custom SparkSession with sparknlp.start():

import sparknlp
spark = sparknlp.start()
type(spark)
# >>> pyspark.sql.session.SparkSession
from sparknlp.base import DocumentAssembler

Thomas (2020): The chimango caracara book

In-Class Demo 4

 

Distributed Sentiment Analysis with Spark NLP

References

Thomas, Alex. 2020. Natural Language Processing with Spark NLP: Learning to Understand Text at Scale. "O’Reilly Media, Inc."