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rbd: issue resync only if the force flag is set

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During failover we do demote the volume on the primary
as the image is still not promoted yet on the remote cluster,
there are spurious split-brain errors reported by RBD,
the Cephcsi resync will attempt to resync from the "known"
secondary and that will cause data loss

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna 2022-06-22 11:18:10 +05:30 committed by mergify[bot]
parent af0cd0fd80
commit 3acaa018db
1 changed files with 27 additions and 11 deletions
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38
internal/rbd/replicationcontrollerserver.go
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@ -856,18 +856,11 @@ func (rs *ReplicationServer) ResyncVolume(ctx context.Context,
ready = checkRemoteSiteStatus(ctx, mirrorStatus)
}
if resyncRequired(localStatus) {
err = rbdVol.resyncImage()
if err != nil {
log.ErrorLog(ctx, err.Error())
err = resyncVolume(localStatus, rbdVol, req.Force)
if err != nil {
log.ErrorLog(ctx, err.Error())
return nil, status.Error(codes.Internal, err.Error())
}
// If we issued a resync, return a non-final error as image needs to be recreated
// locally. Caller retries till RBD syncs an initial version of the image to
// report its status in the resync request.
return nil, status.Error(codes.Unavailable, "awaiting initial resync due to split brain")
return nil, err
}
err = checkVolumeResyncStatus(localStatus)
@ -887,6 +880,29 @@ func (rs *ReplicationServer) ResyncVolume(ctx context.Context,
return resp, nil
}
func resyncVolume(localStatus librbd.SiteMirrorImageStatus, rbdVol *rbdVolume, force bool) error {
if resyncRequired(localStatus) {
// If the force option is not set return the error message to retry
// with Force option.
if !force {
return status.Errorf(codes.FailedPrecondition,
"image is in %q state, description (%s). Force resync to recover volume",
localStatus.State, localStatus.Description)
}
err := rbdVol.resyncImage()
if err != nil {
return status.Error(codes.Internal, err.Error())
}
// If we issued a resync, return a non-final error as image needs to be recreated
// locally. Caller retries till RBD syncs an initial version of the image to
// report its status in the resync request.
return status.Error(codes.Unavailable, "awaiting initial resync due to split brain")
}
return nil
}
func checkVolumeResyncStatus(localStatus librbd.SiteMirrorImageStatus) error {
// we are considering 2 states to check resync started and resync completed
// as below. all other states will be considered as an error state so that