What does VPC.Update scheduled mean?

[mwaag]

Hi,

when editing a vpc via webinterface there is a field to define a source nat ip adress for that vpc which is empty by default:

Even when leaving this field empty and confirming with OK, there is a VPC.UPDATE scheduled:

What exactly does that mean?
When will this update happen and does this possibly change the source nat ip even if the user leaves this field empty?

For info, we recently upgraded from 4.18.2.4 to 4.20.3.0 and wasn't aware of this field before. Was this introduced in 4.19/4.20?

(For background: One of our clients experienced a sudden change of source nat ip and the event log shows a scheduled vpc.update followed by a completed router.stop and we are now investigating the root cause:

[DaanHoogland]

@mwaag , was the updateVpc API called? this should not happen automatically through any kind of schedule. The field was added to the API in 4.19, in #6442.

[mwaag]

No, in my testcase i used the 'Edit VPC'-function via webinterface as shown in my first screenshot.
(iam aware that this trigger in fact an api-call in background, but webinterface was what I used).

This triggered only a schedule vpc.update up to now (but did not execute the update itself). Do you now, when it will be executed? Can i trigger its execution somehow?

[weizhouapache]

No, in my testcase i used the 'Edit VPC'-function via webinterface as shown in my first screenshot. (iam aware that this trigger in fact an api-call in background, but webinterface was what I used).

This triggered only a schedule vpc.update up to now (but did not execute the update itself). Do you now, when it will be executed? Can i trigger its execution somehow?

it is executed immediately.