DAOS-18487 placement: fix a bug in shard remapping chain #17536
Conversation
This file contains hidden or 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
For the case of 2nd remap, if the spare target is DOWN2UP need to set fs_down2up flag, to make it be able to set shard's po_rebuilding flag at the end. One example case - Target A is DOWN, rebuild completed and status changed to DOWNOUT Target B is DOWN, rebuild started but not completed but admin do the reint, its status change to UP and with DOWN2UP flag. In object layout calculation, one shard firstly located in Target A, but 1st remap to Target B, but still need to do 2nd remap. In this case should set fs_down2up flag which is not set in the 1st remap, to avoid not be able to set shard's po_rebuilding flag so will cause read from it (invalid place). This bug could cause data corruption (mostly like with cause shard losing). Signed-off-by: Xuezhao Liu <xuezhao.liu@hpe.com>
|
Errors are Unable to load ticket data |
Collaborator
|
Test stage NLT on EL 8.8 completed with status UNSTABLE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net/job/daos-stack/job/daos//view/change-requests/job/PR-17536/1/testReport/ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
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Outdated suggestions cannot be applied.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.
For the case of 2nd remap, if the spare target is DOWN2UP need to set fs_down2up flag, to make it be able to set shard's po_rebuilding flag at the end.
One example case -
Target A is DOWN, rebuild completed and status changed to DOWNOUT Target B is DOWN, rebuild started but not completed but admin do the reint, its status change to UP and with DOWN2UP flag.
In object layout calculation, one shard firstly located in Target A, but 1st remap to Target B, but still need to do 2nd remap. In this case should set fs_down2up flag which is not set in the 1st remap, to avoid not be able to set shard's po_rebuilding flag so will cause read from it (invalid place).
This bug could cause data corruption (mostly like with cause shard losing).
Steps for the author:
After all prior steps are complete: