Task with cron runs an hour later the first time

[jcarranzar]

Steps to reproduce:
List the minimal actions needed to reproduce the behavior.

1. Create task with cron at 15:00 (system time) -> for example: option task = {name: "CalculosT1", cron: "0 15 * * *", offset: 15m}

Expected behavior:
This task should be executed EVERY TIME at 15:00 (system time), in my case 14:00 UTC

Actual behavior:
First time after save or after reload docker container, the task runs 1 hour after, at 16 (system time)/ 15:00 UTC, it seems like dont get the cron correctly. Then, the other times it runs at 15:00 (system time)

Environment info:

• System info: Linux 4.19.104-microsoft-standard x86_64
• InfluxDB version: InfluxDB 2.0.3 (git: fe04d34) build_date: 2020-12-15T01:00:16Z
• Other relevant environment details: Docker version 3.0.0 (50684)

Config:

Logs:

Performance:

[jcarranzar]

Hi there! It has been about 2 months and I would like to know if you have managed to replicate my issue or if it really is a bug or not. Thanks!

[danxmoran]

@wbaker85 and I are now both seeing this in this test when running locally on our Macs. The problem doesn't reproduce in CI.

EDIT: Might have spoken too soon. We do see an off-by-one failure but it's not on the 1st task run; it's when the task's schedule crosses over a daylight-savings-time boundary.

[jcarranzar]

@danxmoran You have managed to find another clue of the bug?