queryControllerDNS: avoid using zero TTL when query fails #3235
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
eriknordmark
approved these changes
May 22, 2023
When controllerDNSCache would fail to translate controller hostname, the TTL was returned as zero, which then caused queryControllerDNS to set dnsTimer to zero interval, thus erasing any delay and triggering a loop of DNS query retries with very high frequency. Signed-off-by: Milan Lenco <milan@zededa.com>
It seems to have been there ever since this controller IP caching was introduced, i.e. from 7.3.0. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
When
controllerDNSCachewould fail to translate controller hostname, the TTL was returned as zero, which then causedqueryControllerDNSto setdnsTimerto zero interval, thus erasing any delay and triggering a loop of DNS query retries with very high frequency.