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Let’s start with the following code: You throw exception as soon as your form is loaded, however, catch block is not executed. What happens? Initially I though this is out of band exception which is thrown on another thread. But after some debugging the reason is much simpler. WinForms provide special event handler for unhandled … Continue reading Exception propagation in WinForms
It sometimes happens that your EMR job crashes or hangs indefinitely with no meaningful log. You can try to capture memory dump but it is not very useful when your cluster machines have hundreds gigabytes of memory each. Below are “fixes” which worked for me. If it just crashes with lost slave or lost task, … Continue reading Random notes from crashing and hanging EMR Spark job
When you deploy your package to Amazon Elastic Map Reduce (EMR), you can access the AWS SDK provided by the platform. This gets tricky if you compile your code against different version of SDK because then you may get very cryptic bugs in runtime, like class not found or method not existing. You should always … Continue reading Investigating AWS SDK conflicts in EMR
Today we are going to implement trivial ScheduledExecutorService in C#. Introduction We want to have a thread pool of fixed size which we can use to execute three types of tasks: One time tasks Tasks with fixed delay between executions Tasks with fixed rate of executions Let’s go. Bookkeeping We start with the following: We … Continue reading Trivial ScheduledThreadPoolExecutor in C#
This is the fourth part of the WRK series. For your convenience you can find other parts in the table of contents in Part 1 — Compiling and debugging To create a new module, you need to prepare some directories and a make file. First, create the following structure in base\ntos Next, in module\BUILD\ put … Continue reading Windows Research Kernel Part 4 — New module