Nielsen Interview Questions and Answers

Q1. Terraform basic questions
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Q1. Questions on Linux, Python
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Q1. What is a bloom filter in hbase ?
Ans. 
A bloom filter in HBase is a data structure used to test whether a given element is a member of a set.
• Bloom filters are used to reduce the number of disk reads in HBase by quickly determining if a row may exist in a table.

• They are implemented as a compact array of bits, with multiple hash functions used to map elements to bits.

• Bloom filters can produce false positives but not false negatives, making them useful for pre...read more
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Q2. Write a query to remove duplicate rows in pyspark based on primary key.
Ans. 
Use dropDuplicates() function in pyspark to remove duplicate rows based on primary key.
• Use dropDuplicates() function on the DataFrame with the primary key column specified.

• Specify the subset parameter in dropDuplicates() to specify the primary key column.

• Example: df.dropDuplicates(['primary_key_column'])
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10 mcqs and 2 coding questions were given to solve in the language of your choice

Q1. Dbms transactions
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Q2. Os based questions
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Q1. Print number of characters in a string using Stream APIs
Ans. 
Use Stream APIs to count number of characters in a string
• Use the chars() method to convert the string to a stream of characters

• Use the count() method to count the number of characters in the stream
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Q1. Self introductions
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Q1. About career growth
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Q1. How do you prioritize tasks when faced with multiple situations?
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Q2. Tell us time when you had to resolve conflict within in your team, how did you handle it?
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