This Week in Fluvio #4

Aug 26, 2021

Welcome to the fourth edition of This Week in Fluvio, our weekly newsletter for development updates to Fluvio open source. Fluvio is a distributed, programmable streaming platform written in Rust.

 

Release of Fluvio 0.9.4

 

Compression for WASM binaries

This week we received an excellent contribution from @tomindisguise for compressing WebAssembly binaries before uploading them to Fluvio’s Streaming Processing Units (SPUs). As some background, one of Fluvio’s premiere features is the ability to upload user-defined code to perform inline processing on streaming data, a feature we call SmartStreams. User code must be compiled to WebAssembly and uploaded to SPUs upon opening a stream, and this change helps by significantly reducing the size of the upload request. Thank you to @tomindisguise for the contribution!

 

Bugfix for applying SmartStreams while using --disable-continuous

This is a fix to a CLI bug that cropped up when we introduced SmartStreams. For some context, Fluvio used to have two types of requests for consuming data: a “fetch” request and a “stream” request. The fetch request would retrieve only data that was known in advance to be available, whereas a stream request keeps the connection open and continues to deliver new data to the consumer as it arrives to the topic.

When using the Fluvio CLI Consumer, the default behavior is to open a stream and continue listening for data, but one may optionally use the -d/--disable-continuous flag in order to make a one-time request and close the connection. These two behaviors internally mapped to the “stream request” and the “fetch request”, respectively. The bug that cropped up is that we realized that SmartStream logic was only being applied to stream requests, not to fetch requests.

This led us to simply hurry up on deprecating the fetch request, which is something that we have been meaning to do for a while now. As of this fix, --disable-continuous is now implemented by using a stream request that closes upon reaching the known end of the stream. This should not cause any breakages to CLI users, but now using -d/--disable-continuous with a SmartStream will properly apply the logic to the stream as expected.

 

Now publishing aarch64 docker images

That’s right, not only do we now offer support for aarch64 binaries themselves, we are also publishing Fluvio docker images for aarch64 targets. This means that Fluvio may now be deployed on AWS Graviton! We’re very excited about this advancement, and we’re looking forward to seeing it deployed on ARM in the near future!

 

Conclusion

For the full list of changes, be sure to check out our CHANGELOG. If you have any questions or are interested in contributing, be sure to join our Discord channel and come say hello!

Until next week!