Background processes and tasks in an async world

Aug 14, 20151 like533 views

The document discusses using background jobs and remote queues in Node.js applications. Background jobs allow long-running or blocking functions to be run asynchronously without blocking the main event loop. Remote queues provide a way to run background jobs on worker servers to improve scalability. Examples of Node.js modules for implementing background jobs and remote queues are provided, including node-resque, kue, and bull. The benefits of remote queues include allowing more work to be done simultaneously, preserving jobs if servers fail, and enabling horizontal scaling by adding more workers. Functions that could block the event loop or prevent timely responses are good candidates to run as background jobs using a remote queue.

background jobs
in an async world
Cody Stoltman
@particlebanana

who are you?
Cody Stoltman
@particlebanana
co-founder of Treeline
Sails.js core team
maintainer of Waterline ORM

browser /foo/bar
does
some stuff
normal request/response lifecycle

browser /foo/bar
does
some stuff
slow function
long running process lifecycle

browser /foo/bar
does
some stuff
slow function

this isn’t ruby
node is async
we have callbacks

browser 1
traditionally
browser 2
server
do something

browser 1
with node.js
browser 2
server
do something
browser 3

browser /foo/bar
does
some stuff
slow fuction

how can we handle that function?
• callbacks
• just ignore the callback
• over engineer something related
to process spawning

Background processes and tasks in an async world

why this isn’t ideal
we aren’t blocking so the server can
keep responding
but we have to wait until the process is
done before responding to the client’s
request

why this isn’t ideal
the client get’s data back but we have no
clue as to the success/failure of the task.
we could add logs but we have no way to
give the client feedback or to re-try.

let’s learn from our synchronous,
threaded brothers and sisters
whats the answer then?

how can we handle that function?
• remote queues

remote queue
queue worker
slow function
server
does
some stuff
job
browser
job

why this is better
We can observe our queue
We can scale out horizontally and add
capacity as needed
Our queue can be preserved so no jobs
are abandoned

scalable remote queue
server server server server
worker worker worker worker
load balancer
queue

call stack libuv api
callback queue
event loop
.on()
handler
handler ()

call stack libuv api
callback queue
event loop
.on()
handler
handler ()
delayFn ()
handler handler handler
handler ()

so synchronous code blocks the
event loop, don’t do that
what happens if we don’t block it?

call stack libuv api
callback queue
event loop
.on()
handler
handler()
sendEmail() queue
cbhandler handler
cb()handler()
sendEmail() queue
cb

remote queues are good because
they let you do more, faster
so more work in the event loop
means less concurrency

when should you move a function into
a background job?

if for any reason it will block the
event loop

it will prevent the response from
returning in a timely manner

node modules
node-resque
github.com/taskrabbit/node-resque
kue
github.com/Automattic/kue
bull
github.com/OptimalBits/bull

you could also build on a
traditional message queue

summary
remote queues in node same as
anywhere else
actually better because you can do more
on a single cpu simultaneously
(example: sending emails)

someone should write one
agenda (mongo only)
github.com/rschmukler/agenda
until then

thanks!
Phillip Roberts (@latentﬂip) 
github.com/latentﬂip/loupe
Evan Tahler (@evantahler) 
blog.evantahler.com

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Transcript: Canadian book publishing: Insights from the latest salary survey ...BookNet Canada

Join us for a presentation in partnership with the Association of Canadian Publishers (ACP) as they share results from the recently conducted Canadian Book Publishing Industry Salary Survey. This comprehensive survey provides key insights into average salaries across departments, roles, and demographic metrics. Members of ACP’s Diversity and Inclusion Committee will join us to unpack what the findings mean in the context of justice, equity, diversity, and inclusion in the industry. Results of the 2024 Canadian Book Publishing Industry Salary Survey: https://publishers.ca/wp-content/uploads/2025/04/ACP_Salary_Survey_FINAL-2.pdf Link to presentation slides and transcript: https://bnctechforum.ca/sessions/canadian-book-publishing-insights-from-the-latest-salary-survey/ Presented by BookNet Canada and the Association of Canadian Publishers on May 1, 2025 with support from the Department of Canadian Heritage.

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We keep hearing that “integration” is old news, with modern architectures and platforms promising frictionless connectivity. So, is enterprise integration really dead? Not exactly! In this session, we’ll talk about how AI-infused applications and tool-calling agents are redefining the concept of integration, especially when combined with the power of Apache Camel. We will discuss the the role of enterprise integration in an era where Large Language Models (LLMs) and agent-driven automation can interpret business needs, handle routing, and invoke Camel endpoints with minimal developer intervention. You will see how these AI-enabled systems help weave business data, applications, and services together giving us flexibility and freeing us from hardcoding boilerplate of integration flows. You’ll walk away with: An updated perspective on the future of “integration” in a world driven by AI, LLMs, and intelligent agents. Real-world examples of how tool-calling functionality can transform Camel routes into dynamic, adaptive workflows. Code examples how to merge AI capabilities with Apache Camel to deliver flexible, event-driven architectures at scale. Roadmap strategies for integrating LLM-powered agents into your enterprise, orchestrating services that previously demanded complex, rigid solutions. Join us to see why rumours of integration’s relevancy have been greatly exaggerated—and see first hand how Camel, powered by AI, is quietly reinventing how we connect the enterprise.