Quick update that I created a small Firefox extension to view the current online number of visitors from Google Analytics in the browser tab itself. Here its how looks like: The extension can be downloaded from Firefox extensions page
Recently, I read an article on Sockets in your shell and I thought it was amazing find for me. Lot of times especially working with docker, I had to install tools like telnet, nc and curl to check basic connectivity. Little did I realize that this functionality is inbuilt into shell. For ex, let’s say we have a basic http server running in local as follows: const http = require('http'); const requestListener = function (req,...
There was a famous bug which existed in JDK implementation of Binary Search Randomly, I tried to reproduce the issue this weekend. Here is the flawed implementation public int search(int[] arr, int target) { int low = 0; int high = arr.length - 1; while (low <= high) { int mid = (high + low) / 2; if(arr[mid] == target) { return mid; } else if (arr[mid] < target) { low = mid + 1;...
In one our recent requirements, we were required to very accurately split the incoming traffic into multiple distribution patterns. This is a very common algorithm requirement in use cases such as load balancer where you would assign the weight to each resource and load balancer would split the incoming traffic into the resources based on the desired weightages. I had written the article Incrementally routing traffic to newer version of service and an astute follower...
Yesterday, I observed painfully slow debugging in IntelliJ. Every step over or step in took almost 10 seconds to perform. It was a simple Java console application having about some 88k entries in few arrays. I had successfully debugged applications having millions of entries in arrays, lists and maps before without any performance issues. Then I looked at the toString() implementation of the custom object which I was holding in the array public String toString()...
Recently, I setup dual boot of Windows 10 and Kali Linux on different SDD. Technically, its not a dual boot when you install two different OS on different hard disks altogether. However, with dropping prices of SSD’s many people want to install these OS on different hard disks altogether rather than cramming up them in single hard disk with single partition. In my case, UEFI rather than legacy boot. Here is the quick guide to...
Starting Chrome v86, browser cache is going to be partitioned which are going to have interesting consequences. What does it mean? Previously, if you would have loaded a file such as js, css from a CDN from a particular site (lets say Facebook) was cached in the browser cache and available to be used from cache even in a different site (lets say Reddit) But this is changing now, which means that a cache is...
I have been always fascinated by Object oriented programming in JavaScript. Its different from usually OOPs provided by languages such as Java. In this post, we will look at various approaches of achieving Object oriented programming in JavaScript, and their pros and cons Solution 1 : Generate objects using a function function userCreator(name, score) { const newUser = {}; newUser.name = name; newUser.score = score; newUser.increment = function() { newUser.score++; }; return newUser; }; const...
I have been recently playing with Cassandra a lot using Python cassandra client. One issue I saw a lot while timeouts connecting cassandra. The default timeout set in the client library is 5 seconds and it isn’t very intuitive how to increase it. from cassandra.cluster import Cluster from cassandra.cluster import ExecutionProfile from cassandra.auth import PlainTextAuthProvider from cassandra.cluster import EXEC_PROFILE_DEFAULT auth_provider = PlainTextAuthProvider(username='username', password='password') profile = ExecutionProfile(request_timeout=60) cluster = Cluster( ['hostnanme'], auth_provider=auth_provider, execution_profiles={EXEC_PROFILE_DEFAULT: profile}, connect_timeout=120, )...
Its amazing how after working so many years on Javascript, I still get some of the basic concepts wrong. The concept in question is Event loop and Call Stack. To get it refreshed, here is the teaser. What is the output of the below snippet. function printHello() { console.log("Hello"); } function blockFor1Sec() { let arr = []; for (let i = 0; i < 100000; ++i) { arr.push(i); } } setTimeout(printHello, 0); blockFor1Sec(); console.log("Me first!");...