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03: Understanding Big O notations

Q. Have you seen job advertisements requiring Java candidates to work in real-time or high volume transaction processing systems? If you are applying for such jobs, you can be quizzed on Big O notation. Here are some basics to brush up on. … Read more ›...

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Big O notation questions and answers with Java examples

The Big O notation and Java data structures go hand-in-hand in coding tests & job interviews Q1. What do you know about the big-O notation and can you give some examples with respect to different data structures? A1. The Big-O notation simply describes how well an algorithm scales or performs...

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04: Q19 - Q26 Scala Data Structures basics interview questions & answers
03: Q13 – Q18 Scala FP combinators interview questions & answers
02: Q6 - Q12 Scala FP currying, closures & partial functions interview Q&As
01C: Q1 - Q6 Scala interview Q&As on Functional Programming
Scala way of coding
16: Coding Scala Way – Scala concurrency styles
15: Coding Scala Way – Scala concurrency & closure vs function definition
14: Coding Scala Way – Scala concurrency with Future
12: Coding Scala Way - Actors with Akka "Ask Pattern" - Part 2
13: Coding Scala Way - 2 Actors with Akka - part 3
11: Coding Scala Way - Actors with Akka - part 1
10: Coding Scala Way - groupBy, mapValues & identity
09: Coding Scala Way - Fibonacci Series
08: Coding Scala Way - Recursion & Higher Order Function
07: Coding Scala Way – Regular Expressions
3 Reasons Why I started Learning Scala
06: Coding Scala Way - Reduce & Compose functions
05: Coding Scala Way - FP concepts
04: Coding Scala Way – Null checks with Option-Some-None
03: Coding Scala Way – Lazy Eval
02: Coding Scala Way - Recursion & Iterator in FP
01: Coding "Java way in Scala" Vs "Scala way in Scala"
80+ Big Data Tutorials
BDT - ⏯ Starting with Big Data
01: Databricks getting started - Spark, Shell, SQL
⏯ 03: Java program to work with HDFS
⏯ 02: Hue and terminal window to work with HDFS
09: Docker Tutorial: Getting started with Hadoop Big Data on Cloudera quickstart
01A: Spark on Zeppelin - Docker pull from Docker hub
BDT - Starting with Spark & Scala
10. Setting up & getting started with Hive
09. Getting started with Spark & Hadoop - client mode on local & cluster mode on yarn
08. Setting up & getting started with Hadoop on Mac
07: Getting started with Spark-submit
06: Setting up Spark-shell on Mac & getting started
05: Setting up & getting started with Spark local mode with Sbt & Scala
04. Setting up & getting started with sbt
03. Setting up Scala and Spark with Maven
02. Setting up Scala IDE & using Maven plugins for Java developers
01. Setting up Scala & practicing the concepts via REPL the Scala way for Java developers
BDT - Starting with Python
02: Getting started with conda on Mac OS
01: Getting started with Python on Mac OS
BDT - Kafka
03: Apache Kafka Connector Tutorial
02: Apache Kafka multi-broker cluster tutorial
01: Getting started with Apache Kafka on Mac tutorial
BDT - Pig
3. Apache Pig: XPath for XML
2. Apache Pig: Regex (Regular expressions)
1. Apache Pig Getting started
BDT - Apache Storm
02: Simple Apache Storm application running on a single node local cluster
02: Simple Apache Storm application running inside Eclipse in a local cluster
01: Installing & getting started with Apache Storm on Cloudera quickstart
BDT - Spark Scala on Zeppelin
13: Spark on Zeppelin – Dataframe date & timestamp
12: Spark on Zeppelin - Dataframe pivot
11: Spark on Zeppelin - Dataframe groupBy, collect_list, explode & window
10: Spark on Zeppelin - union, udf and explode
09: Spark on Zeppelin - convert DataFrames to RDD and RDD to DataFrame
08: Spark on Zeppelin - convert DataFrames to RDD[Row] and RDD[Row] to DataFrame
07: Spark on Zeppelin - window functions in Scala
06: Spark on Zeppelin - RDD operation zipWithIndex
05: Spark on Zeppelin - semi-structured log file
04: Spark on Zeppelin - DataFrame joins in Scala
03: Spark on Zeppelin - DataFrame Operations in Scala
02: Spark on Zeppelin - read a file from local file system
01A: Spark on Zeppelin - Docker pull from Docker hub
01B: Spark on Zeppelin - custom Dockerfile
BDT - Cloudera
⏯ 01: Cloudera Manager Tutorial
Before running a Spark job on a YARN cluster in Cloudera and about the Spark history server
Understanding Cloudera Hadoop users
BDT - Cloudera on Docker
31: Docker Tutorial: Apache Spark streaming in Scala with Apache Kafka on Cloudera quickstart
30: Docker Tutorial: Apache Spark streaming in Python 3 with Apache Kafka on Cloudera quickstart
29: Docker Tutorial: Apache Kafka with Python 3 on Cloudera quickstart
28: Docker Tutorial: Apache Spark streaming with Kafka in Java on Cloudera quickstart
27: Docker Tutorial: Apache Kafka with Java API on Cloudera quickstart
26: Docker Tutorial: Apache Kafka install, create topic & publish message on Cloudera quickstart
25: Docker Tutorial: HBase (i.e. NoSQL) Java API on Cloudera quickstart
24: Docker Tutorial: HBase (i.e. NoSQL DB) Shell on Cloudera quickstart
23: Docker Tutorial: Apache Spark (spark-submit) in Python 3 with virtual env on Cloudera quickstart
22: Docker Tutorial: Apache Spark (spark-submit) in Python 2.6 on Cloudera quickstart
21: Docker Tutorial: Apache Spark (spark-submit) in Scala on Cloudera quickstart
20: Docker Tutorial: Apache Spark (spark-submit) in Java on Cloudera quickstart
19: Docker Tutorial: Apache Spark SQL - on Cloudera quickstart
18: Docker Tutorial: sqoop export - on Cloudera quickstart
17: Docker Tutorial: sqoop import - on Cloudera quickstart
16: Docker Tutorial: Apache Spark (spark-shell) & parquet-tools – csv to parquet on Cloudera quickstart
15: Docker Tutorial: Hive & parquet-tools - csv to parquet on Cloudera quickstart
14: Docker Tutorial: Hive (via beeline) on Cloudera quickstart
13: Docker Tutorial: Apache Spark (spark-shell & pyspark) on Cloudera quickstart
12: Docker Tutorial: Hadoop Big Data configuration files on Cloudera quickstart
11: Docker Tutorial: Hadoop Big Data CLIs on Cloudera quickstart
10: Docker Tutorial: Hadoop Big Data services & folders on Cloudera quickstart
09: Docker Tutorial: Getting started with Hadoop Big Data on Cloudera quickstart
BDT - File Formats
07: Avro IDL (e.g. avdl) to Java objects & Avro Schemas (i.e. avsc) tutorial
06: Avro Schema evolution tutorial
01b: Convert XML file To Sequence File – writing & reading – Hadoop File System (i.e HDFS)
05: Convert XML file To an Avro File with avro-maven-plugin & Apache Spark
04: Convert XML file To an Avro File with Apache Spark – writing & reading
03: Convert XML file To an Avro File - writing & reading
02: Convert XML file To Sequence File with Apache Spark - writing & reading
01a: Convert XML file To Sequence File - writing & reading - Local File System
BDT - Spark on Docker
08: Apache Spark standalone cluster on Docker to read from AWS S3 bucket & write to MySQL database
07: Apache Spark standalone cluster on Docker to read from & write to AWS S3 bucket
06: Apache Spark standalone cluster on Docker to read from AWS S3 bucket
05: Apache Spark local mode on Docker to read from AWS S3 bucket
04: Apache Spark cluster – Docker compose tutorial with Java, Maven & spark-submit
03: Apache Spark cluster - Docker compose tutorial with Java, Maven & spark-shell
02: Apache Spark - local mode on Docker tutorial with Java & Maven
01: Docker tutorial with Java & Maven
BDT - Flume
02: Apache Flume with Custom classes for JMS Source & HDFS Sink
01: Apache Flume with JMS source (Websphere MQ) and HDFS sink
BDT - Hadoop HDFS
05: Create or append a Sequence file to HDFS – Hadoop API tutorial
04: Create new or append to an existing AVRO file tutorial
03: Create or append a file to HDFS - Hadoop API tutorial
02: Java to write from/to Local to HDFS File System
01: Apache Hadoop HDFS Tutorial
BDT - HBase (NoSQL)
5. HBase atomic operations by examples
4. Setting up HBase with zookeeper to be used in Java via maven project
3. Understanding HBase (NoSQL) database basics in 7 steps
2. HBase Shell commands
1. HBase Tutorial Getting Started
BDT - Hive (SQL)
13: Q98 - Q104 Apache Hive Basics Interview questions & answers
BDT - Hadoop & Spark
15: Spark joins with Dataframes & SQLContext
14: Spark joins with SQLContext & JavaPairRDD
13: Spark inner & outer joins in Java with JavaPairRDDs
12: XML Processing in Spark with XmlInputFormat
02a: Learn Spark writing to Avro using Avro IDL
11. What are part- files in Hadoop & 6 ways to merge them
10: Solving AlreadyBeingCreatedException & LeaseExpiredException thrown from your Spark jobs
09: Running a Spark job on YARN cluster in Cloudera
08: Learn Spark how to convert RDD in Java to Dataframe with examples
07: Learn Spark Dataframes to do ETL in Java with examples
06: Learn how to access Hive from Spark via SparkSQL & Dataframes by example
05: Learn Hive to write to and read from AVRO & Parquet files by examples
04: Learn how to connect to HBase from Spark using Java API
03: Learn Spark & Parquet Write & Read in Java by example
02: Learn Spark & AVRO Write & Read in Java by example
01: Learn Hadoop API by examples in Java
BDT - Map Reduce
MapReduce to HBase: Read from & write to
2. Hadoop MapReduce Basic Tutorial
1. Hadoop MapReduce Basic Tutorial
BDT - Spark and Scala
02: Spark RDD grouping with groupBy & cogroup in Scala tutorial
01: Spark RDD joins in Scala tutorial
BDT - Spark & Java
12: Spark streaming with “fileStream” and "PortableDataStream" simple tutorial
11: Spark streaming with "textFileStream" simple tutorial
05a: Spark DataFrame simple tutorial
10: Spark RDDs to HBase & HBase to Spark RDDs
09: Append to AVRO from Spark with distributed Zookeeper locking using Apache's Curator framework
08: Spark writing RDDs to multiple text files & HAR to solve small files issue
07: spark-xml to split & read very large XML files
01B: Spark tutorial – writing to HDFS from Spark using Hadoop API
06: Spark Streaming with Flume Avro Sink Tutorial
05: Spark SQL & CSV with DataFrame Tutorial
04: Running a Simple Spark Job in local & cluster modes
03: Spark tutorial – reading a Sequence File from HDFS
02: Spark tutorial – reading a file from HDFS
01: Spark tutorial- writing a file from a local file system to HDFS
BDT - PySpark on Databricks
Q08- Q12 Scenarios Based Hive Query Language (i.e. HQL) Interview Q&As
22: Writing Tests in Databricks Notebooks in Python
04b: Databricks – Spark SCD Type 2 with Merge
04a: Databricks – Spark SCD Type 1 with Merge
11A: Databricks – Spark ML – Pandas Dataframe & Matplotlib
21: Databricks – Spark ML Naive Bayes
20: Databricks – Spark ML K-Means
19: Databricks – Spark ML Random Forrest Classifier
18: Databricks – Spark ML Decision Tree Classifier
17: Databricks – Spark ML K-Folds Cross Validation
16: Databricks – Spark ML Multiclass Logistic Regression & Pipeline
15: Databricks – Spark ML – Classification with Logistic Regression
13: Databricks – Spark ML – Dummy Variables
12: Databricks – Spark ML – Categorical Features
14: Databricks – Spark ML – StringIndexer & OneHotEncoder
11: Databricks – Spark ML – Multivariate Linear Regression
10: Databricks - Spark ML - Linear Regression
09: Databricks - Spark Problem 2
08: Databricks – Spark problem 1
07: Databricks – groupBy, collect_list & explode
06: Databricks – Spark Window functions
05: Databricks - Spark UDFs
04: Databricks - Spark SCD Type 2
03: Databricks - Spark SCD Type 1
02: Databricks - Spark schemas, casting & PySpark API
01: Databricks getting started - Spark, Shell, SQL
BDT - Zookeeper
01: Getting started with Zookeeper tutorial
80+ Python FAQs
22: Python Duck typing tutorial
21: Python function overriding tutorial
20: Python function overloading tutorial
19: Python operator overloading tutorial
17: Python OOP and @property decorator tutorial
18: Python Abstract Base Classes (i.e. ABC) tutorial
16: Python multithreading producer/consumer & semaphores tutorial
14: Python Closures, Partial functions and Currying tutorial
13: Python working with files tutorial
12: Python enumerate vs zip tutorial
15: Python multithreading tutorial
11: Python *args and **kwargs tutorial
10: Python working with collections tutorial
09: Python working with String tutorial
08: Python Data modelling tutorial
07: Python dictionary tutorial
06: Object introspection in Python tutorial
05: Python debugging tutorial
04: In Python functions are objects tutorial
03: Python context manager tutorial
02: Python comprehensions tutorial
01: Python Iterators, Generators & Decorators Tutorial

Java Interview Q&As

300+ Core Java Interview Q&As
Core Java - Overview
Core Java - Data types
Core Java - Constructors
Core Java - Reserved Key Words
Core Java - Classes
Core Java - Objects
Core Java - OOP
Core Java - GC
Core Java - Generics
Core Java - FP
Core Java - OOP to FP
Core Java - I/O
Core Java - Multithreading
Core Java - Data Structures
Core Java - Annotations
Core Java - AOP
Core Java - Other
Core Java - Collection API
Core Java - Differences X & Y
Core Java - Event Driven
Core Java - Exceptions
Core Java - Java 7
Core Java - Java 8
Core Java - JVM
Core Java - Reactive Program
Core Java - Swing & AWT
Core Java - Understanding
300+ JEE Interview Q&As
JEE - Overview
JEE - Web basics
JEE - Web Services
JEE - JPA
JEE - JTA
JEE - API Design
JEE - JDBC
JEE - Microservices
JEE - JMS
JEE - JMX
JEE - JNDI and LDAP
JEE - JSF
JEE - Other
80+ Spring & Hibernate Q&As
Frameworks - Hibernate Q&As
Frameworks - Spring Core
Frameworks - Spring MVC
Frameworks - Spring Cloud
Frameworks - Spring boot
Frameworks - Spring IO
Frameworks - Spring Config
80+ Companion Technologies
Companion - Angular JS
Companion - Domain Knowledge
Companion - FIX
Companion - Git & SVN
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Companion - JavaScript
Companion - JMeter
Companion - Maven
Companion - NoSQL
Companion - Regex
Companion - SQL
Companion - Unix
Companion - JSON
Companion - XML
Companion - XSD
Companion - YAML
Tutorials Java, JEE, Spring
Tutorials - ⏯ Starting with Java
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Tutorials - Core Java
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Tutorials - Java 8
Tutorials - JSON and Java
Tutorials - Java Beginner
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Tutorials - CSV and Java
Tutorials - Docker
Tutorials - JEE
Tutorials - Web & Web Services
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Tutorials - Spring & Hibernate
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Tutorials - Productivity Tools
Tutorials - Kubernetes
Tutorials - ⏯ Videos
Tutorials - ⏯ Starting with Java
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Tutorials - ⏯ JDBC, Hibernate
Tutorials - ⏯ Spring Boot
Tutorials - ⏯ Angular with Spring
Tutorials - ⏯ Q&As
Tutorials - Other
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Tutorials - Pentaho Kettle ETL
Tutorials - Unix
Tutorials - Webspeher MQ
Tutorials - YAML
150+ Coding Q&As ✍
Coding - Can you write code?
Coding - Complete the code
Coding - Converting from A to B
Coding - Designing your classes
Coding - Data Structures
Coding - Arrays
Coding - Big O notation
Coding - Graph Structure
Coding - LinkedList Structure
Coding - Map Structure
Coding - Pointer Algorithms
Coding - Queue Structure
Coding - Searching Algo
Coding - Sorting Algo
Coding - Stack Structure
Coding - Tree structure
Coding - Data Which & Why
Coding - Passing the unit tests
Coding - What is wrong?
Coding - Home Assignments
Coding - Written Test Core Java
Coding - Written Test JEE
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