George Jen, Jen Tek LLC We have a big data/analytics project that needs to persist data structures constructed in graph, i.e., in Vertices and Edges (Nodes and Relationships) into a database. A relational database is not an option in our use case. We looked into a number of open source…

George Jen, Jen Tek LLC For our purpose, we need a MariaDB (MySQL) instance. Therefore, we want a custom docker image that includes the following: CentOS 8 MariaDB Server version: 10.3.28 (MySQL) Python3 with mariadb python3 connector installed Java Development Toolkit 1.8 Development Tools including C/C++ compiler and git etc. Jupyter-notebook server to run…

George Jen, Jen Tek LLC Significance This video is likely to be the first documentary publicly available on the successful DIY disassembly and reassembly of Canon Rebel T8i (850D) digital SLR camera. Summary Shutter curtain blade of the Canon T8i was stuck and it displayed error 20 as result. This…

George Jen, Jen Tek LLC We have built a custom docker image that includes everything a data engineering developer would need: CentOS 8 image Python3 Java Development Toolkit 1.8 Jupyter-notebook server to run Python and Scala from the host ssh-server for the ease of connecting to the container using ssh and scp, as…

George Jen, Jen Tek LLC We have built a custom docker image that includes everything a data engineering developer would need: CentOS 8 image Python3 Java Development Toolkit 1.8 Jupyter-notebook server to run Python and Scala Spylon Kernel from the host ssh-server for the ease of connecting to the container using ssh and…

George Jen, Jen Tek LLC Introduction We have built a custom docker image that includes everything a data engineering developer would need: CentOS 8 image Python3 Java Development Toolkit 1.8 Jupyter-notebook server to run Python from the host ssh-server for the ease of connecting to the container using ssh and scp, as oppose…

George Jen, Jen Tek LLC Introduction We want to build a custom docker image that includes everything a data engineering developer would need: CentOS 8 image Python3 Java Development Toolkit 1.8 Jupyter-notebook server to run Python from the host ssh-server for the ease of connecting to the container using ssh and scp, as…

Surprisingly good Moon photo with low cost old manual lens Canon DSLR camera body Today is Chinese mid autumn day, also known as moon festival, on that day, the shape of the moon is fullest during the year. I want to take photo shot at the moon, but I only…

Northwind database is a popular demo database and originally came from Microsoft Access. It is great for students to practice SQL challenges and it has been ported to many RDBMS, open source or not. We have ported it to Apache Spark SQL, a convenience for those who have setup Apache…