[Firestore] Unhandled error Error read ECONNRESET after enabling 'preferRest'

[johnnyoshika]

[REQUIRED] Step 2: Describe your environment

• Operating System version: Linux
• Firebase SDK version: [email protected]
• Firebase Product: Firestore
• Node.js version: 16
• NPM version: 8.1.2

[REQUIRED] Step 3: Describe the problem

Steps to reproduce:

Ever since I enabled preferRest:

const db = initializeFirestore(app, {
  preferRest: true,
});

...I've been getting many Unhandled error Error read ECONNRESET error notifications from Google Cloud. Here's a typical notification message:

Relevant Code:

const db = initializeFirestore(app, {
  preferRest: true,
});

[google-oss-bot]

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[johnnyoshika]

Here's another one with a different error message, but also only started appearing after enabling preferRest:

[ehsannas]

tracking internally b/291972583

[sbhvt]

We are also seeing lots of ECONNRESET since using rest. In our case, it is because the firebase functions are now setting FIRESTORE_PREFER_REST to true in environments which essentially turned this functionality on for us by default which caused us to get ECONNRESET errors across all of the functions which we recently deployed. I linked a new issue asking for guidance on this (see link to issue above in @google-cloud/firestore repo).

[ehsannas]

A common root cause of this error is that not all promises are awaited. In other words, there are background tasks that finish after the function loses CPU/Network access. See the "Do not start background activities" section.

If there's a more specific repro that you'd like me to investigate, please let me know.