AWS offers managed service Amazon MemoryDB which is redis compatible. The entire keyspace in Redis cluster is divided into hash slots and these slots are assigned to multiple nodes. In redis, getting a single value is straightforward...
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What’s the first link that google throws at you when you search anything? Wikipedia is always foremost search result that you encounter. When it comes to science and technology, Wikipedia often provides good foundation for the beginners. However when it comes to politics, Wikipedia often begins to falter...
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I stumbled upon a ransomware negotiation simulator by Financial Times. It’s a mock simulation where you’re in a hot seat at a hacked company, trying to stop cybercriminals from releasing sensitive data they have stolen from your systems. ..
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Waterfire is a popular festival at Providence, Rhode Island. The Waterplace park is lit up with bonfires along with boat processions and music. There are also food trucks if you are feeling hungry...
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AWS Glue job are fully managed ETL service. Glue job uses hive-compatible metastore called Glue Data catalog. ..
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As I was walking down the aisle of a food mart, I was consumed with guilt about whether or not to buy a large can of coke. My waist is competing with inflation as both refused to halt their progress. I have thrown my weighing machine in the thrash as she refuses to lie at least once about my weight...
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Design an algorithm to serialize and deserialize a binary tree. There is no restriction on how your serialization/deserialization algorithm should work. You just need to ensure that a binary tree can be serialized to a string and this string can be deserialized to the original tree structure...
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It’s a just another day in twitter when you come across tweets disparaging Hinduism. “Hinduism is a veritable chambers of horrors..
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Dear Vishi, this is my daily log for July 11, 2022...
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Dear Vishi, this is my daily log for July 10, 2022...
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A sentence is a string of single-space separated words where each word can contain digits, lowercase letters, and the dollar sign ‘$’. A word represents a price if it is a sequence of digits preceded by a dollar sign...
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I am an ardent fan of Tomb Raider game series. I grew up falling in love with Tomb Raider III. Much time swept away since I have tried any other game of this series. So finally I decided to try my hands on Rise of Tomb Raider. ..
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Given a string s, sort it in decreasing order based on the frequency of the characters. The frequency of a character is the number of times it appears in the string...
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Amazon Redshift is fully managed warehouse service provided by AWS. The Amazon Redshift engine is a SQL-compliant, massively-parallel, query processing and database management system designed to support analytics workload...
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In python, everything is an object. So functons are also objects which can be passed around. A decorator is a function that receives a function and returns a function...
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An interesting problem on leetcode to find minimum number of ways to pick up consecutive cards. We will start with a brute force algorithm that would exceed in time limit. Later we will improve upon this algorithm using hashmap...
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I am an ardent vim user. A forked version of vim called neovim recently caught my attention. It has more features like support for language server protocol that provides auto-complete, etc. LunarVim provides neovim configuration files so that it behaves as an IDE...
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Windows Subsystem for Linux (WSL2) provides native Linux environment for Windows. It’s great alternative to cygwin which can’t run native Linux apps. However WSL2 doesn’t have out-of-box connectivity with internet once you connect with vpn...
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I grew up in India with a diet of basmati rice and superstition. I have seen pedestrians freezing at the sight of a black cat crossing their path for fear of bad luck. Lemon and chilis hang in front of vehicles to ward off bad spirits. I fondly remember numerous advertisements proclaiming protection from evil eyes. Recently I stumbled upon an ad that refreshed my memories...
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After the outbreak of Covid-19 pandemic and Fall of Kabul, year 2022 was supposed to instill normalcy back into the world. However world looks more topsy-turvy than before with the advent of war between Ukraine and Russia...
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When you develop AWS lambda functions, you might feel the need to install additional python libraries. This can be achieved using Lambda layers that can be included in any lambda function...
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Lots of website have added dark themes to their platform. Twitter also has a dark mode which I really love while reading at night. Also there are benefits of using dark mode for the eyes...
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You are given a 0-indexed binary array nums of length n. nums can be divided at index i (where 0 <= i <= n) into two arrays (possibly empty) numsleft and numsright..
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Badminton sport has a low learning curve unlike tennis. Even your granny can hit a birdie. I grew up playing badminton but decided to try my luck with tennis. “Playing tennis would be a cakewalk”, I thought. However my hubris was soon deflated...
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In this leetcode problem, we are asked to find the length of the longest string of characters in a provided string that does not contain repeating characters. In other words, in the string abcabcbb the longest substring without repeating characters is abc (with a length of 3)...
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One of the nifty feature in any code development is the ability to debug your application using break points. Submitting a Spark job while waiting for it to complete will waste a lot of time debugging. Spark jobs can be debugging with break points and step over and step into and step out commands...
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“Marriages are made in heaven” is an old adage quite prevalent across all cultures. Whether heaven harbors any interest in the mortal affair has still scant empirical evidence. However, there is a rare marriage that not only invites heaven’s fury but also is consummated by mutual suicide...
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There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites[i] = [ai, bi] indicates that you must take course bi first if you want to take course ai...
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You are given a string s and an integer k, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them, causing the left and the right side of the deleted substring to concatenate together...
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Today I walked a little further,
further than yesterday.
while my feet ache and plead,
I dragged ‘em without paying any heed...
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Questions involving the binary tree data structure are very popular in tech interviews, and can be challenging and varied! A binary tree is a data structure consisting of a collection of nodes (starting at a root node), where each node consists of a value (data), together with a directed edges to at most two nodes (the “left child” and “right child”), with the additional conditions that no two edges point to the same node and no edge points to the root. I recently solved an interesting problem on binary tree...
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Ternary string is an interesting problem that could be solved using two pointers techniques. It’s a convenient way to keep track of multiple indices. This helps in making decisions based on two values...
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It’s one of the most popular questions on leetcode that seems very easy at first. Coin change is a classic dynamic programming problem. I will proceed with an obvious (albeit wrong) solution and subsequently proceed to an efficient correct solution...
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I was an intern working in Upstate New York. Public transport required hopping multiple trains & buses and was woefully tedious. I found some other interns who were willing to split the fare with me for Uber. Even a ride in Uber consumed more than two hours. Occasionally I used to steal a quick nap. After a siesta of a few hours, I had always woken up with a gaggle of laughter. My peers often pulled my leg, “You were snoring like a pig”. However, I dismissed my faux pas as just a mere nuisance...
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When the alarm clock breaks my slumber, I roll down on my bed, blindly crawling towards my alarm clock as if it was a bomb to diffuse it. After multiple snoozes, I relinquished my dreams and come to my senses. Gulping water after I wake up is my first activity. Next, I excuse myself to the bathroom for “nature call”. All living things from a simple bacteria to a giant dinosaur needs to perform two basic life function; eat and excrete...
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There’s an interesting problem I recently solved on leetcode based on dynamic programming. My Github repository contains list of all problems that I have solved. I often start with a brute force approach without fretting about time complexity. Later I try to improve my algorithm for a better efficient solution...
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This is my first time visiting Mexico city, also known as CDMX. Initially I was scared to come here because of Narcos. However during my brief two weeks stay I have felt safe. With my limited Spanish, I decided to book an Airbnb experience for a bike tour...
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Do you believe in ghosts? I did when I was a kid. I was infatuated with the paranormal. Sometimes I used to wander around desolate buildings with other kids concocting horror stories. I loquaciously gossiped about ghosts in school which earned me a sizeable audience. I was convinced that someday I would stumble upon an innocuous spirit that would instill some unearthly powers in me...
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AWS CDK is a great framework to programmatically deploy cloudformation stack. If you are unfamiliar with AWS CDK, I would recommend first to check out Getting started with AWS CDK...
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Cloudformation service in AWS allows you to describe an entire set of resources required to make a pipeline. The cloudformation template can be described in JSON or YAML format. Updating the cloudformation template was not a pleasant experience. I wanted to discover alternative ways to generate cloudformation template programmatically...
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What’s a nationality? The idea of the nation-state is pretty modern. Ancient lands were usually under the suzerainty of kings & queens. While most emperors spilled blood to expand their kingdom, the common man was seldom concerned about borders...
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If you are not living under a cave, you probably have already heard about carcinogens. News is often awash with headlines alerting perils of carcinogens. In a nutshell, these are substances that have the potential to cause cancer. Not all carcinogens cause cancer. Not all cancer is caused by carcinogens. Cancer is a complicated group of diseases. Of course, it’s not my forte to expound on the subject of cancer. However, we should try to understand how carcinogens are identified and what we should do to protect ourselves...
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Today I tried to meditate again. I used Insight Timer app for background sound. However I think I’ll just stick to Youtube as it has more varieties. I struggled for 20 minutes sitting cross-legged as my mind wandered in the labyrinth of thoughts. I guess it will take more practice to hone my skill. Have you ever wondered how monks can meditate for countless hours or days?..
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Did you remember we watched The Time Machine movie together? The protagonist loses his fiancée when a mugger kills her. He then builds a time machine to travel back in time to save her. Of course multiple movies have been made romanticizing the concept of time machine...
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Today the sleep was better. Yesterday I was sleep deprived. Hunger is the best ingredient to make any food delicious. Likewise a sound sleep is like a manna from heaven for me...
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I didn’t have proper sleep today. I could barely keep my eyes open. Empty stomach and a heavy mind is a disaster for sound sleep. Yesterday I was brooding too much while trying to sleep. I guess I need to filter noises in my mind. Proper sleep is the basic physiological need in Maslow’s pyramid. I guess it’s a blessed day not to have a insomnia...
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Recently I finished watching web-series Scam 1992. It’s based on story of Harshad Mehta, a famous Indian stockbrocker who made fortunes in stocks. Despite his iconic success & failure, the series rekindled my interest in world of “stocks”. I guess the famous dialogue “Risk Hai Toh Ishq Hai” has stuck with me...
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I am currently reading The Emperor of Maladies. This is a fascination book where Siddhartha Mukherjee not only educate its readers about cancer disease but also shares interesting tidbits. Werner Bezwoda was an infamous oncologist who fudged data about bone marrow transplant in women with metastatic breast cancer...
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Poetry is a great dependency management tool in python. It’s better than managing a flat file like requirements.txt. There are also other great tools like pipenv. However I found poetry much simpler in resolving dependencies...
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Dynamodb is a great NoSQL service by AWS. One of the most common use case is to export data to s3. There are multiple ways to export data to s3. For this tutorial we will leverage lambda function to achieve our goal...
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I recently came across a Youtube video of a famous Indian actress Genelia Deshmukh promoting homeopathic products. The Bollywood couple, Riteish and Genelia Deshmukh, has invested in Welcome Cure, a Homeopathy treatment service platform. Science has repeatedly dismissed homeopathy as quakery or at best placebo, but that has not deter companies or Indian government to continue to fund and research in homeopathy...
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This is my Part 1 of the review of Carl Sagan's book, Demon-Haunted World. This is more of my commentary rather than a review of the book.
I have begun to realize how many posts on Facebook, Whatsapp, etc contains pseudoscience and misinformation. Few posts are easy to debunk. Magic water curing cancer is a no-brainer. However other posts are too meticulous to debunk. I thought it might be fruitful for me as a layman to learn critical & skeptical thinking from a famous astrophysicist, Carl Sagan...
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I was looking to write a scala script to fetch large data from Oracle database. I was earlier using the Alteryx software to fetch data (around 1 million rows) from oracle which took around 7 minutes. Licensed softwares like Alteryx or Informatica, etc are great, but I was looking for a free solution...
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It feels great to sleep at night. I have a small but a cozy room. It’s not lavish or splending. It doesn’t even hoard much furniture. However it’s as peaceful as it can get...
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Jobs failed! Screamed an automatic failure alert in email inbox. Existing python scripts were failing in the server which fetched data from Oracle database. I wondered if the credentials had changed...
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India is currently witnessing multiple protests against the Citizenship Amendment Act (CAA) passed by the BJP (the ruling party of India). In a nutshell it fast tracks citizenship to few religiously persecuted refugees like Hindu, Sikh, Jain, Buddhist, Christian and Parsi from neighbouring countries...
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Graph are data structures made of vertices & edges. There are lots of interesting problems that can be solved using graphs. Part 1 covers the basic for creating a template for graph data structure...
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I recently came across a simple telephonic interview problem. The problem was to sort an array recursively. But even numbers need to be placed before odd numbers. At first glance it was obvious that it was a simple case of implementation of merge sort...
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When I was a kid, I was perturbed at the outbreaks of new diseases. There was no Swine Flue before twenty first century or HIV before tenth century. Why nature was hell-bent in pulling diseases out of a hat everytime humans make progress in science?..
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Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists...
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I wanted to decode an old debate that I saw on ndtv. It was about a controversy erupted by the comments of a junior Indian education minister, Satyapal Singh. He is India’s Minister of State for Human Resource Development. He had claimed that evolution is “scientifically wrong” because he never saw an ape turning into human being...
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Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero...
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I might slip into a cesspool of hate in criticizing India’s most successful movie, Baahubali 2: The Conclusion. One of my Telugu colleague eyes beamed with pride when she told me how she watched first day first show & how this movie has propelled Telugu movies in the same league of Hollywood...
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Recently, my roommate, had his job contract terminated. He found a new job in another city which meant I had to hunt for a new roommate. So I quickly posted an ad on Sulekha, a popular website in USA among Indians...
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The sun’s rays had already crept through my window & drenched my room with light. Sleep taste sweetest when you resist it. It is but with a heavy heart that I relinquish my sleep & pull myself together...
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On a brisk day, I was carpooling with my manager. Amidst the roaring traffic, was the familiar melodious voice on the radio. We have grown accustomed to the RJ who played songs that was music to our ears. As my manager revved up the engine, with the occasional drip in audio of the AM, often we broke into conversation...
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It was just another day in Bangalore. I caught the bus from the /Kormangala bus depot. Amid exhausting heat & nudging elbows, I somehow managed to grab a seat in the bus. Securing a seat in the Indian bus during peak time is considered a fortune. This often attracts resentful eyes. However my Indian genes have made me immune to both pani puri & judgment...
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Browsers have made browsing insanely easy. Toolbar fetches webpage magically. However, under the hood, lots of requests are exchanged. These requests are based on REST architecture.
What is REST? REST is REpresentational State Transfer. Loosely speaking it defines how resources are exchanged based on item of request. Two most common HTTP Request Methods are POST and GET. Using tshark, we can see the headers exchange as you browse the web...
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I finally divorced Windows soon after I fell in love with Linux. Ubuntu was my first love. I met her on Distrowatch. But she spoke no English. So I spent hours gawking at her sleaky terminal trying to learn her language, bash...
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Any deterministic general sorting algorithm has average case time complexity O(nlogn) . However, certain sorting algorithm can run faster in O(n) but with limitation. Instead of comparision-based sort, each element is looked individually by its value. Radix sort is one fine example of integer sorting...
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Imagine a sunset, with a tired sun sinking over a meadow. The chirping of birds steals your attention as they return to their homes. And while the sun disappears, you sink back and relish your sourrounding...
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“If you’ve got nothing to hide, you’ve got nothing to fear”. This is the most common retort used by governments to espouse Mass surveillance. They do it in the pretext of security. But even if you’re not a fugitive, you have the right to protect your privacy...
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“India’s Daughter”, a documentary on Gang rape of 2012 has been officially banned. The Indian government went all gun to arrest the release of the documentary in India & abroad. BBC, Google, Youtube have all been sent legal notices to comply with the government’s diktat. Congratulations! We have shown the world that we will silence anything that will make us uncomfortable...
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Different religion tells us about plethora of beautiful tales about the genesis of humans. We humans, like any other trivial species, descended not from heaven (sigh!) but due to mitosis in single cell organisms...
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Often we meet,
Avoiding prying eyes secretly,
In between stretches a velvet sky,
Only gulf in between us apparently...
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I was lying around on a secluded meadow. Under the open sky I gazed at the clouds scudding by. Suddenly it seemed that I was drifting away. A scathing sound began to wreak the whole place. And the mischievous alarm pulled me out of my dreams...
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I walked miles on my feet and hope,
against all weather, people and slope,
But after some distance I could not keep,
enough pace as the way was steep...
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I once complained to my friend of his desktop on his computer. His desktop was a tangled mess of icons. “It’s easier this way.”, he chuckled, “I can quickly find all the softwares I need.”. I showed him my desktop which was spick and span.”Doesn’t it consumes time in finding the softwares you need?”, he asked...
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It was just another day in Gurgaon. The hot scorching sun was parading the city. The inescapable life of riding with the autowalas is the common sight of this concrete jungle. Though I am a FOSS enthusiast, my first job landed me to just another India’s IT company. I vividly remember the countless occasions when ViM saved my day...
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Once a friend of mine asked if I could Hack. I asked him what he meant by hacking. Bemused at such a lame question he replied, “Don’t you know what hacking is?”. On insisting he reluctantly explained, “breaking into website or stealing passwords of Facebook, etc”. I was crestfallen at the rampant misconception about hacking...
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As I lay on my cosy bed,
a hanging moon did my curtains lit,
under my pillow sank my weary head,
and slumber weaved its sleepy knit...
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The Debian claimed to be the Universal Operating System. Impressed by the stability and the community, I decided to switch to Debian. Earlier I used Fedora which handled all the hassles for me. Unlike Fedora, I had manually configure it to connect to the internet. But I soon realized it was not as difficult as it earlier seemed to be...
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After a ruckus, the government agreed to roll back the proposed decision to increase FDI in retail sector. This could have paved way for the behemoth giants like Walmart to enter India. Indian Inc. was largely disappointed with the lack of much needed retail reform while the opposition parties including the local shopkeeper rejoiced over the fear of Walmart...
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