Experiences, Thought and Studies from the essence of the Computer Science
When it comes to stream processing, the Open Source community provides an entire ecosystem to tackle a set of generic problems. Among the emergent Apache projects, Beam is providing a clean programming model intended to be run on top of a runtime like Flink, Spark, Google Cloud DataFlow, etc. A really convenient declarative… Continue reading Apache Beam+Apache Flink/Spark for Batch&Stream Processing
Call for Papers! ADIDSE IARIA Special Track aims at tackling the problems and discussing the advancements in Data-Intensive Distributed Systems Engineering with the community of Engineers and Scientists out there. Come and join us… The advent of the IoT (Internet of Things), by forecasts, is going to bring 40 Billion connected devices by 2020. Such… Continue reading Advancements in Data-Intensive Distributed Systems Engineering
Knot is a network server as well as Haboob. The difference is the concurrency model: Knot is thread-based, instead Haboob is event-based [9]. Clearly, from the benchmark results, the poll()/epoll() mechanism is a serious bottleneck as soon as the number of active concurrent clients become relevant (in the specific case, at 16384 clients the trashing… Continue reading Scaling to Thousands of Threads
Everything begins with a refresher reading of my fundamental papers – yes, I use a set of papers and books as reference material. This paper is titled: “Why Events Are A Bad Idea (for high-concurrency servers)“, by Rob von Behren at the time of writing a PhD fellow at Berkeley [18]. Von Behren opens with: “Event-based… Continue reading Scalable I/O: Events- Vs Multithreading-based
Intro to FOSDEM FOSDEM (Free and Open Source Software Developers’ European Meeting) is the European Open Source Conference oriented to Engineers, grouping the Open Source Communities in a University Campus and managed by volunteers. It is an intensive two days conference that, simply, enlightens… Main Sponsors: RedHat, Google, Oracle, Cisco, Mozilla, Trivago, Bloomberg, GitHib, O’Really… Continue reading FOSDEM 2016 – Day 2 Log
Intro to FOSDEM FOSDEM (Free and Open Source Software Developers’ European Meeting) is the European Open Source Conference oriented to Engineers, grouping the Open Source Communities in a University Campus and managed by volunteers. It is an intensive two days conference that, simply, enlightens… Main Sponsors: RedHat, Google, Oracle, Cisco, Mozilla, Trivago, Bloomberg, GitHib, O’Really… Continue reading FOSDEM 2016 -Day 1 Log
Puzzle Given an Unsorted Single Linked List, provide an Algorithm to reverse such Linked List using only 2 pointers. Input A Single Linked List. Example. 1 -> 4 -> 3 -> 2 -> 0 Output A Reversed Single Linked List. Example. 0 -> 2 -> 3 -> 4 -> 1 Solution Using Java as… Continue reading Coding: Reversing Unordered Single Linked List using 2 Pointers
Puzzle Given an array of Integers that presents several levels of nesting, provide an algorithm to flatten the input array. Input A nested array of arrays. Example. [[1,2,[3]],4] Output A flat array. Example. [1,2,3,4] Solution using Java as Programming Language Gist with runnable code and tests. Discussion To get the job done, the solution adopts… Continue reading Coding: Flattening Nested Arrays
Demystifying Hashing Hashing is a broadly studied topic among mathematicians, in fact Hash Functions are attractive mainly for their many applications in the modern Computer Science. Very often, it is possible to see confusion speaking about Hashing. People confuse Hashing with Base-changes (e.g. from Base-10 to Base-32 or Base-8); some other confuse Hashing with Random Number… Continue reading Hashing Explained
Intro In the Zipfian world of AK, the HyperLogLog distinct value (DV) sketch reigns supreme. This DV sketch is the workhorse behind the majority of our DV counters (and we’re not alone) and enables us to have a real time, in memory data store with incredibly high throughput. HLL was conceived of by Flajolet et.…
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