Are immediately scheduled functions FIFO?

i.e. if I write

export const doLotsOfThings = internalMutation({
  args: {},
  handler: async (ctx) => {
    const items = await ctx.db.query('items').collect()

    for (const item of items) {
      await ctx.scheduler.runAfter(0, internal.items.doSomethingToItem, {
        itemId: item._id,
      })
    }

    await ctx.scheduler.runAfter(0, internal.somethingElse.doSomeGlobalThing)
  },
})

export const doLotsOfThings = internalMutation({
  args: {},
  handler: async (ctx) => {
    const items = await ctx.db.query('items').collect()

    for (const item of items) {
      await ctx.scheduler.runAfter(0, internal.items.doSomethingToItem, {
        itemId: item._id,
      })
    }

    await ctx.scheduler.runAfter(0, internal.somethingElse.doSomeGlobalThing)
  },
})

is it guaranteed that all doSomethingToItem will have resolved before doSomeGlobalThing is called?

5 Replies

Convex Bot•3w ago

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lee•3w ago

nope, they run with parallelism

charlieOP•3w ago

thanks! is there a way I can run a bunch of things, await them all to complete, then run something else? if just using Promise.all or for/await in this function, I would hit the execution time limit

lee•3w ago

hmm sounds like a tricky problem. you can probably coordinate this by writing statuses to the database, and each one of the "bunch of things" at the end checks if all the others are done, and if they are, schedules the "something else"

charlieOP•3w ago

got it, thank you! esp. for the quick response

Are immediately scheduled functions FIFO?

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