Authorsergii-demianchuk

Software engineer with over 18 year’s experience. Everyday stack: PHP, Python, Java, Javascript, Symfony, Flask, Spring, Vue, Docker, AWS Cloud, Machine Learning, Ansible, Terraform, Jenkins, MariaDB, MySQL, Mongo, Redis, ElasticSeach

How to secure web application with AWS WAF and CloudWatch

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Udemy Coupon: CYBERSECURITYMAY – active 02.05.2024-02.06.2024; in case coupons are already expired, please check that page regularly – new one will appear soon ENROLL AT Cyber Security course Hi, my name is Sergii and I am glad to represent my course “DevSecOps: How to secure web application with AWS WAF and CloudWatch”. The course stars from creating a small API application, built...

OpenSearch ML reranking with AWS Personalize Service

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Hi, Recently I had an opportunity to make a practical research around AWS Personalize Service. My main goal was to test Personalized-Ranking recipe and to verify how it works in pair with rather fresh AWS feature – OpenSearch Personalize ranking plugin. I had to verify if is possible to bring our existing search system at new level with ML personalizing features. The main thing that I was...

Symfony vs Flask vs Spring Boot – part 1 usability and speed of coding

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Hi,  While making an online course “Elasticsearch as you have never known it before” I’ve created 3 separate sections with practice examples on how to build an advanced search system based on the Elasticsearch engine. According to course video sections next tutorials also appeared accordingly at current blog: Java Elasticsearch Elasticsearch Python Flask Symfony Elasticsearch I suppose it...

How to work with Elasticsearch 8 using Spring Boot 3.x and Spring Data Elasticsearch 5.x

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Hi, Elasticsearch fans At current article I would like to show you how to work with Elasticsearch 8 version using Spring Boot 3.x version and Spring Data Elasticsearch 5.x package. It appeared that at Spring Data Elasticsearch 5.x version has a lot of different changes. First of all Elasticsearch 8 has security options enabled out of the box. As result the way we have to connect to search engine...

ElasticSearch as you have never known it before – EXCLUSIVE CONTENT

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Udemy Coupons: ELASTICSEARCHMAY – active 02.05.2024-02.06.2024; in case coupons are already expired, please check that page regularly – new one will appear soon; Here I want to present an introduction to my on-line course: “Elasticsearch as you have never known it before”. At that course I am sharing my production experience with using ElasticSearch for building advanced search...

AWS devops: ElasticSearch at AWS with terraform and ansible

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Udemy Coupon: DEVOPSMAY – active 02.05.2024-02.06.2024 in case coupons are already expired, please check that page regularly – new one will appear soon; ENROLL AT AWS devops course Are you interested in docker orchestration? Would you like to uncover deep insights and pitfalls of AWS? Do you want to see the real power of Terraform and Ansible at real commercial examples? Or maybe you are...

AWS OpenSearch Benchmarks – Part 1

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Hi, DevOps fans Recently, 04.12.2023-05.12.2023. I have a pleasant occasion to perform AWS OpenSearch service performance benchmarks. The reason for that has a rather long story, but I will try to shorten it as much as possible. There is one application that uses Elasticsearch for performing different search operations. I will call it “Search App” below in text. Current application was migrated...

Maintenance vs perfect code or When to avoid design patterns?

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Hi, The more I am working at Software production area (and it is almost 20 years), the more I am coming to the conclusion, that support and maintenance in many cases are more essential then “beautiful” code with using design patterns. Don’t think that I have something against best practices – quite reverse. I am fond of design programming patterns and I am using it...

Elasticsearch indexing secrets or how to speed up indexing

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Hi, Elasticsearch fans. As probably all of you know, indexing of documents at Elasticsearch can appear to be a rather often operation. Changing fields mapping or document relationships, changing the number of shards and many other things force us to make reindexing of whole data. And when we have great amounts of data – then it appears to be a great problem. At that article we will speak...

Redis TIPS and TRICKS – how to Debug memory usage

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Hi, Recently I’ve met a problem with REDIS memory usage at AWS ElastiCache service. It appeared that after some release, that happened 2 weeks ago, memory usage started to grow gradually like a snail. As result our memory monitoring caught the problem rather late. Here is the screen for AWS CloudWatch how it looked. While analyzing release by itself, I found a lot of changes related with...

architecture AWS cluster cyber-security devops devops-basics docker elasticsearch flask geo high availability java machine learning opensearch php programming languages python recommendation systems search systems spring boot symfony