We probably heard of unit testing in Go, but do we ever thought of running a code coverage for our code source? Maybe… the question is why do we need a code coverage? Goals of code coverage Traditionally, we dive into the code development and created lots of code pieces which is not battled…

Cases is we are going to develop an HTTP REST api server and fortunately Golang has provided such support through the net/http package. Writing the server is typically straightforward… however the challenging part is how to test it. …

What is geoip processor? In short a processor which translates IP addresses into geo-location data. Take an example you have an IP address “8.8.8.8” which should be resolved as the following: The geo-location would be useful when you are expecting a longitutude-latitude pair for chart plotting (kibana Map visualization) OR simply you just…

It is untold since when did most of the software engineer’s interview become LeetCode oriented (or equivalent code judgement platforms). This blog is debate / brainstorm whether we should still employ such platforms as a medium for evaulating candidates. it is FAIR ??? Supporters mention that by applying a non-human interacted code judgement platform…

It all started in a morning when a colleague messaged me a question: “morning… I am trying to get parts of the email address being searchable under Elasticsearch. Do you have any idea?” My instant reply was “sure…? I thought this is for sure possible, isn’t it?” After some screenshots…

as a part-time content composer (aka author), striving to get a huge fan club is always a headache. You might wonder why a composer would need that amout of fans… the WHY following is a courtesty to recognize the composer’s work. Apparently why would somebody spend hours of preparation and editing to…

1. What is a SummingMergeTree? In Clickhouse, there are several Table Engine families and MergeTree(s) is the most popular one. If you are looking for OLTP features, the good old MergeTree should be good enough. However if you are looking additional features like the following: data deduplication AND summarization of numeric columns then SummingMergeTree is…

Clickhouse is a realtime OLTP (Online Transaction Processing) engine which uses SQL-like syntax. Talking about SQL, we can create Tables and Views to retrieve data. Usually View is a read-only structure aggregating results from 1 or more Tables — this is handy for report creation which required lots of input…

Clickhouse is a powerful realtime OLAP (Online Analytical Processing) system for your big data. Since it is “BIG” data, we would need to housekeep them in an efficient way. …