acgourley

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acgourley

#!/bin/sh

palette="/tmp/palette.png"
fps=8
filters="fps="$fps",scale=600:-2:flags=lanczos"

for i in `seq 1 $fps`;
        do
		echo starting image $i
		sem --id prim$1 -j+0 ~/go/bin/primitive -i $1 -o $1.0$i.png -n $2 -m $3

acgourley

For several weeks our production deployment (Express, Bookshelf/Knex -> MySQL) was randomly having queries fail resulting in 500 errors and server crashes.

The first issue is that the Knex library was using Pool2 slightly incorrectly, and when a ETIMEDOUT error occurred, it tried to release the pooled connection twice. This would create an exception which would crash express (unless you have a top level error handler defined in your express setup)

In this issue (myndzi/pool2#12 (comment)) filed on pool2 by the author of knex (tgriesser) the author of pool2 (myndzi) points out the error handling issue and created a fork of knex with the fix git+https://github.com/myndzi/knex#double-release

After installing the fix on my server, whenever ETIMEDOUT occured an error would be generated in the expected part of the code so that I could decide to retry the query or fail gracefully. Removing the ETIMEDOUT entirely would be

acgourley

  public void UpdateTexture(float value) {
		checkGlError("pre-UpdateTexture");

		// Save the current state
		IntBuffer previousFBO = IntBuffer.allocate(1);
		IntBuffer previousRenderBuffer = IntBuffer.allocate(1);
		IntBuffer previous_program = IntBuffer.allocate(1);
		GLES20.glGetIntegerv(GLES20.GL_FRAMEBUFFER_BINDING, previousFBO);
		GLES20.glGetIntegerv(GLES20.GL_RENDERBUFFER_BINDING,
				previousRenderBuffer);