How We Found a Missing Scala Class
heapanalytics.com
How We Found a Missing Scala Class
1–10 of 45 posts
Re: How We Found a Missing Scala Class
#2FYI this domain is blocked by default for uBlock users.
Re: How We Found a Missing Scala Class
#3Heap CTO here – would love to answer any questions you have.
This was my first exposure to btrace, which a super useful swiss army knife for JVM debugging. That made this a worthwhile adventure for sure.
Re: How We Found a Missing Scala Class
#4Why doesn't java just spit out a classLoaderClosed error?
Re: How We Found a Missing Scala Class
#5Heap CTO here – would love to answer any questions you have. This was my first exposure to btrace, which a super useful swiss army knife for JVM debugging. That made this a worthwhile adventure for sure.
How much time did your team spend on the debugging effort?
Re: How We Found a Missing Scala Class
#6Heap CTO here – would love to answer any questions you have. This was my first exposure to btrace, which a super useful swiss army knife for JVM debugging. That made this a worthwhile adventure for sure.
How much time did your team spend on the debugging effort?
Iirc Ivan (post author) spent a few days tracking this down. There were some other debugging dead ends that we omitted in this writeup. One red herring was that the issue appeared to happen during the US morning, so there was some time-of-day component, and we thought it might be a system load issue.
The fix turned out to be fairly involved too – on the order of a week I think.
Ivan works from Bulgaria so sadly he is asleep right now.
Re: How We Found a Missing Scala Class
#7It sounds like you have a lot of operation issues due to the technologies that you used. I mean, at least you aren't doing your backend in node, but running an actor system on top of an actor system is going to be brutal to properly analyze once you actually have scale.
What sort of process do you have for picking trendy technologies vs tested ones, and how much do you talk to people who have built large scale systems before implementing things like scala?
Re: How We Found a Missing Scala Class
#8FYI this domain is blocked by default for uBlock users.
Wild-assed kazinator guess: probably be a substring/regex match on "analytics". Must be a tracking domain!
Re: How We Found a Missing Scala Class
#9It sounds like you have a lot of operation issues due to the technologies that you used. I mean, at least you aren't doing your backend in node, but running an actor system on top of an actor system is going to be brutal to properly analyze once you actually have scale. What sort of process do you have for picking trendy technologies vs tested ones, and how much do you talk to people who have built large scale system…
Yeah... Reading this, it smacked of a possible combination of poor tool choice and over-engineering (which I've been guilty of plenty). I built a video processing/workflow application in Scala with Akka a few years ago and debugging that was hard enough, eventually it was refactored to a simpler Kotlin/Spring application... Actor systems are great for certain use cases but you can really hurt the transparency of your app if you aren't careful. I can't imagine maintaining the OP's application at scale for this use case, but maybe they have someone smarter than me!
Re: How We Found a Missing Scala Class
#10FYI this domain is blocked by default for uBlock users.
Wild-assed kazinator guess: probably be a substring/regex match on "analytics". Must be a tracking domain!
It's on the Pete Lowe Adserver list directly, since Heap is in fact a tracking system and domain: https://pgl.yoyo.org/as/serverlist.php?showintro=0;hostforma...