v2 "blast from the past" on sr_poll failover.

[petersilva]

when upgrading from v2.21 -> v2.24.08 ... we thought we had allowed all the sr_poll file listings to update properly before switching the vip, but we got a blast from the past anyways.

We do not understand why this happenned.

[andreleblanc11]

Another weird behaviour noticed (not sure if it's the same issue or not)

Observed behaviour

• We will be updating a server that has v2.21.04 of sarracenia v2 to a v2.23.07 and up.
• For some polls, once we start them back up, they will re-post all the files it founds on the remote server.
• Normally the ls file is supposed to catch duplicated files and avoid such behaviour.
• For whatever reason, the poll looks to be ignoring the ls file entries and keep posting all of the files found.
• This is slightly different than what is described in the issue description. It will keep having "blasts from the past" until the configuration is restarted and has its cache cleared.
• This doesn't impact all polls, only some specific ones. We're not sure why this is happening.

How to fix

• Stop the poll
• Delete all the files under the cache directory ~sarra/.cache/sarra/poll/my-config/*
• Start the poll
• UPDATE : This fix DOESN'T ALWAYS WORK

Impact

• Luckily the impact isn't that big for the moment. It looks like after restarting the config and deleting the cache that the poll correctly constructs the ls file.

[petersilva]

this might be just a plain problem with v2 polls in the latest release, but only affecting some configurations.
It is not just when starting up after an upgrade. It seems to recur once in a while if the poll runs for a long time.
still clarifying.

work-around: upgrade flow to sr3.