In this article, you will find out how to deal with three errors or alerts related to the etcd component of a Kubernetes cluster: #1 in a rancher web interface - alert component etcd is unhealthy, #2 docker logs etcd - panic: freepages: failed to get all reachable pages (page 6987: multiple references), and #3 docker logs etcd - rafthttp: request cluster ID mismatch ... / rafthttp: request sent was ignored (cluster ID mismatch: ...
Almost all the online shops or content-based sites use Recommendation Systems. The purpose is to improve customer experience, but also to make all the products (content) more visible. Recommendation Systems don’t always require huge resources and lots of software tools. We will show in this article how a Collaborative Filtering Recommendation System can be built using Apache SOLR.
We all know that when you have to process a massive amount of data, Apache Spark is the perfect choice. Apache Spark is a distributed processing framework easy to use and designed for performing a lot of computations and stream processing. However, it can present a range of problems if not properly optimized.
In modern architectures, like microservices, communication between services is done using messaging systems. When we design a system, and we want to use a messaging system, then the following questions must be considered: How do we guarantee that all messages are processed? & How do we avoid or handle duplicate messages?
Is there a recipe behind successful software? What’s the secret ingredient for an enjoyable user experience? Dorin Tecuceanu, UX/UI Designer @eSolutions, is talking at #eSolLightningTalks about frequently used design patterns to better understand their purpose & their dos and don'ts.