Improve Ra server resilience when log infrastructure encounters faults #428
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Outdated suggestions cannot be applied.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.
Various improvements to data safety when log infrastructure processes encounter faults.
In particular there are many improvements and fixes relating to the server -> wal resend protocol including:
wal_down
- now they enter the same await_condition state although with a shorter timeout after which the begin a leader transfer processAlso there is a new feature to configure on a per system basis what kind of server recovery should take place when a ra system starts/restarts. There are 3 options:
undefined
: do not restart any ra serverregistered
: restart all locally registered servers for the systemmfa
: call a custom function that performs the restart.This feature will allow dynamically started ra server to be restarted should the ra system crash and restart.
Also improvements to code coverage and refactoring.
Fixes: #416