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11: Q88 – Q91 Read-Write Vs Append-Only File Systems

Q88. How will you modify a portion of an HDFS file? A88. HDFS is an “append-only” file system. The most common use case of Hadoop data ingestion is to append new sets of event-based and/or sub-transactional data. The large data processing applications are typically built around the premise that things…...

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10: ♥ Q80 – Q87 HBase Schema Design Interview Questions & Answers

Q80. Why is schema design for HBase is different from relational database design? A80. HBase is a columnar NoSQL database. This means no two rows in a table need to have the same columns. In a columnar database table, each row contains cells containing

Values are stored against each

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Posted in Hadoop & BigData Interview Q&A, NoSQL

04: ♥ Coding Scala Way – Part 4

Example #10: Null checks with “Option-Some-None” Nulls in Scala is a code smell, and a better way to handle null values is with an “Option“, which has 2 sub classes “Some” that has a value and a “None” that does not have a value. Instead of checking for “myVal !=

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Posted in Scala way of coding

09: ♦ Q76– Q79 BigData Partitioning, Bucketing & De-normalization Q&As

This extends Q71 – Q75 ETL or ELT on Hadoop Eco System Interview Q&As. Q76. What are the 3 key considerations in processing data in HDFS compared to traditional RDBMS or EDW (i.e. Enterprise Data Warehouse)?AQ76. 1) partitioning, 2) bucketing, and 3) denormalization. Q77. Can you explain the importance of…...

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08: ♦ Q71 – Q75 ETL/ELT on BigData Interview Q&As

Q71. Can ETL in traditional data management (E.g. RDBMs) be migrated to EDH (i.e. Enterprise Data Hub) powered by Hadoop eco system? A71. Yes, it can be migrated, but it is not a direct & straight forward migration as there is a mismatch in underpinning concepts & technologies between RDBMs…...

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03: Coding Scala Way – Part 3

Example #6: Lazy initialization & evaluation of code Scala support “views“, which are collections that can be lazily evaluated. One use for views is when you need to traverse a collection of values which are expensive to compute and you only need one value at a time.

Output:

…...

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02: Coding Scala Way – Part 2

This extends Coding Scala Way – Part 1 Example #4: Write code to process a function using both recursion and functional contaminator like foldLeft Can you write the following code written in Java the Scala way? Java coding question on recursion and generics 1. Define the Trait

2. Recursion…...

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01: Coding Scala Way – Part 1

Example #1: Read from a list & write to a list Scala the Java Way

Output: List(Java Programming, Scala Programming, Ruby Programming) Scala the Scala Way: Using the “map” functional combinator Immutable code as shown below using the “map” function.

Scala the Scala Way: Using recursion

Example…...

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