Ben Chuanlong Du's Blog

It is never too late to learn.

Computer Vision Libraries in Rust

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

resize

resize Image resampling library in pure Rust. - Fast, with support for many pixel formats - No encoders/decoders, meant to be used with some external library - Tuned for resizing to the …

Process Big Data Using Spark

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

General Tips

  1. Please refer to Spark SQL for tips specific to Spark SQL.

  2. It is almost always a good idea to filter out null value in the joinining columns before joining …

Spark Issue: InvalidResourceRequestException

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Symptoms

Final app status: FAILED, exitCode: 10, (reason: Uncaught exception: org.apache.hadoop.yarn.exceptions.InvalidResourceRequestException: Invalid resource request, requested virtual cores < 0, or requested virtual cores > max configured, requestedVirtualCores=16 …

Memory in JVM

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Stack, heap and off-heap are all memory that stored in a computer's RAM.

Stack

Stack is used for static memory allocation. Variables allocated on the stack are stored directly to the …