Job.getDependencies very bad performance

[jmaver-plume]

Problem:
Job.getDependencies performance is really bad to the point of unusable.

For my personal project at 40000 Child jobs generated using FlowProducer it takes more than 5 minutes on a strong personal computer.

The root cause is this [code snippet]. Destructuring is very very slow. (

bullmq/src/classes/job.ts

Lines 672 to 677 in 907ae1d

	const transformedProcessed = Object.entries(processed).reduce(
	(accumulator, [key, value]) => {
	return { ...accumulator, [key]: JSON.parse(value) };
	},
	{},
	);

)

An easy fix is to mutate accumulator object instead of doing destructuring.

const transformedProcessed = Object.entries(processed).reduce(
  (accumulator, [key, value]) => {
    accumulator[key] = JSON.parse(value);
    return accumulator;
  },
  {},
);

Steps to reproduce:

1. Create Flow using FlowProducer with large amount of children (e.g. 40000).
2. Process all those rows.
3. Use job.getDependencies using the parent job of Flow Producer.

[github-actions]

🎉 This issue has been resolved in version 1.86.8 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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