This repository has been archived by the owner on Sep 30, 2024. It is now read-only.
Orchestrator GUI incorrectly shows recovery option for intermediate database in chained replication #1466
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
intermediate database in chained replication openark#1463 Problem: If we've got replication chain A->B->C, and C is down, GUI shows 'Recover' dropdown for node B, but there is no possible recovery action available in such a case. Cause: The root cause of the problem is the analysis logic in Analysis_dao.go:GetReplicationAnalysis(). The condition for setting AllIntermediateMasterReplicasNotReplicating does not check if there are any replicas reachable. So the case when all replicas are dead (no recovery action possible) and the case when some replicas are still reachable, but are not replicating (recovery action possible) are undistingushable. Solution: Improve the analysis logic. Report AllIntermediateMasterReplicasNotReplicating only if all replicas are not replicating, but there are still some reachable replicas. This commit also contains improvement of not trying to query the node which is not reachable (ping node before examinig it)
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
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Outdated suggestions cannot be applied.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.
#1463
Problem:
If we've got replication chain A->B->C, and C is down, GUI shows 'Recover' dropdown for node B, but there is no possible recovery action available in such a case.
Cause:
The root cause of the problem is the analysis logic in Analysis_dao.go:GetReplicationAnalysis(). The condition for setting AllIntermediateMasterReplicasNotReplicating does not check if there are any replicas reachable. So the case when all replicas are dead (no recovery action possible) and the case when some replicas are still reachable, but are not replicating (recovery action possible) are undistingushable.
Solution:
Improve the analysis logic. Report
AllIntermediateMasterReplicasNotReplicating only if all replicas are not replicating, but there are still some reachable replicas.
This commit also contains improvement of not trying to query the node which is not reachable (ping node before examining it)