Technical Questions
How did you find the last n lines of log file ? and if given more time how would you do it efficiently ?
Questions on a personal project and what if we do a change how will you handle it.
Why cannot private methods be overridden?
Why are multiple inheritances not supported by the Java language
Detailed discussion on my previous round's working code.
How data has been stored inside DBMS?
What is Deadlock? How to avoid it?
What is promise chaining in Nodejs
What is Map reduce algorithm?
What is callback hell in Node.js and how to avoid it

Question

Technical Questions

How did you find the last n lines of log file ? and if given more time how would you do it efficiently ?

Questions on a personal project and what if we do a change how will you handle it.

Why cannot private methods be overridden?

Why are multiple inheritances not supported by the Java language

Detailed discussion on my previous round's working code.

How data has been stored inside DBMS?

What is Deadlock? How to avoid it?

What is promise chaining in Nodejs

What is Map reduce algorithm?

What is callback hell in Node.js and how to avoid it

Accepted Answer

Finding the last n lines of a log file and improving efficiency

To find the last n lines of a log file, you can read the file line by line from the end and store the last n lines in a data structure.
To improve efficiency, you can use a seek operation to directly jump to the end of the file and then read backwards.
Another approach is to use a circular buffer to store the last n lines, continuously overwriting the oldest line with the newest one.
Example: If n = 5 and the log file has 100 lines, you can read the file from line 96 to 100 or use a circular buffer to store lines 96 to 100.
If given more time, you can optimize the seek operation by keeping track of the file size and only seek to the end when the file size changes.

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