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One task resizes every image in a batch. A single crash partway through loses the whole thing.
What you'll have at the end
The batch farmed out as a group of small jobs with one callback that fires only once every job finishes
You need
A single job that loops over every item in a batch and does the whole thing itself, running behind a queue you already have set up.
Not covered
Chaining the small jobs into a sequence where each one depends on the last; this recipe only covers work that genuinely runs independently, side by side.
Leans on
Make a background job idempotent
for making each small job safe to run twice, since the redelivery this recipe turns on can occasionally run one small job's work more than once.
Catch the one poison message that retries forever and starves every worker
for a job inside the group that fails without ever giving up, rather than one that exhausts a real retry ceiling.
Drain your workers on deploy without losing the job mid-flight
for a planned shutdown that gives every worker a chance to finish first, rather than one that dies without warning.
Checked 19 Aug 2026
Part of the Background Job Processing Systems cookbook