RangeError: Map maximum size exceeded when uploading a large file to the key-value store

TL;DR

Stream it instead: convert the data into a Readable stream and pass that to Actor.setValue() - the reporter confirmed this works for almost any file size. Do not hand a giant Buffer to Actor.setValue().

Steps

1. Do not hand a giant Buffer to Actor.setValue(). Stream it instead: convert the data into a Readable stream and pass that to Actor.setValue() - the reporter confirmed this works for almost any file size. The maintainer also pointed out that building massive arrays or buffers is slow even without Crawlee in the mix, so if creating the buffer itself hangs, profile that step on its own before blaming the SDK.

When to use

You are seeing this: Do not hand a giant Buffer to Actor.setValue(). Use this skill when you run into "RangeError: Map maximum size exceeded when uploading a large file to the key-value store".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Source: Issue apify/crawlee#1732 (closed, 38 comments): uploading a zip file over 9 MB to an Actor's key-value store with Actor.setValue() crashed with RangeError - Map maximum size exceeded. Creating the zip took 5 seconds, but saving it to the key-value store on the reporter's machine crashed after 15 minutes of runtime.

Verified resolution: Do not hand a giant Buffer to Actor.setValue(). Stream it instead: convert the data into a Readable stream and pass that to Actor.setValue() - the reporter confirmed this works for almost any file size. The maintainer also pointed out that building massive arrays or buffers is slow even without Crawlee in the mix, so if creating the buffer itself hangs, profile that step on its own before blaming the SDK.

Source URL: https://github.com/apify/crawlee/issues/1732