releases
FlowChassis 0.1.0 Released as an Open Source Workflow Kernel for Go
FlowChassis 0.1.0 is out. It is a small workflow execution kernel for Go: you describe a job as steps, and it runs them inside your own program, writes a checkpoint …
Version 0.1.0, Apache 2.0
Workflows that pick up where they stopped, inside your own program
FlowChassis runs your steps, writes a checkpoint before and after each one, retries what fails, undoes what can't finish and resumes every run after a crash. It is a Go library with one journal file: no server, no database, no other modules.
0
Modules it needs besides the Go standard library
240 kills
Two recorded crash demos, 1,200 orders through 240 SIGKILLs: 899 completed, 301 compensated, none lost
Every byte
Of the journal's last record cut off in turn, and every cut opened and resumed
26,000
Steps a second with 64 workers, every checkpoint flushed to disk
Measured with FlowChassis 0.1.0 on a 2-CPU Linux cloud machine. Every number is recorded in test/results in the code repository.
Articles
explainers
What a Workflow Execution Kernel Is and Why Sagas Need One
Picture an online shop’s order code. Reserve the stock. Charge the card. Print a receipt. Book the courier. Email the customer. Five calls, five different systems, …
testing
How FlowChassis Was Tested With 240 Worker Kills and Not One Lost Order
FlowChassis makes one main promise: whatever happens to the process, every run picks up where it stopped, and nothing it did is lost or done twice without warning. The …
about
Why the Project Is Called FlowChassis
A car’s chassis is the frame everything else bolts onto. The engine, the wheels, the body and the seats all hang from it. You don’t see it when you look at a …
case studies
Account Signup With FlowChassis Leaves No Half-Made Accounts
Signing someone up sounds like one action. It’s usually four. You create the user record, give the account its storage, send the welcome email, and switch the …
case studies
Cloud Provisioning With FlowChassis Tears Down What a Failed Deploy Built
Putting a site on a new server takes a handful of calls to different providers. Create the VM. Point a DNS record at it. Get a TLS certificate. Then wait until the thing …
case studies
Video Transcoding With FlowChassis Survives a Crash Without Starting Over
Some jobs take minutes or hours. Transcoding a long video is the classic one. The usual design is a worker that picks up the job and grinds through it, and when that …
case studies
Webhook Delivery With FlowChassis Backs Off Between Retries and Dead-Letters What Fails
If your product sends webhooks, you’ve built a small delivery system whether you meant to or not. Customers’ endpoints go down, answer slowly, return errors …
Embedding FlowChassis in a product?
Teams building it into their own software, and anyone with a question about the journal, the tests or the numbers on this site, are welcome to write.