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[#1996] engine: Always select proper shard for a tree

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Currently there is a possibility for modifying operations to fail
because of I/O errors and a new tree to be created on another shard.
This commit adds existence check for modifying operations.
Read operations remain as they are, not to slow things.
`TreeDrop` is an exception, because this is a tree removal and trying
multiple shards is not an unwanted behaviour.

Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
This commit is contained in:
Evgenii Stratonikov 2022-10-06 19:06:19 +03:00 • committed by fyrchik
parent 08efe6eb11
commit d8d3588e1b
7 changed files with 128 additions and 38 deletions
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98
pkg/local_object_storage/engine/tree.go
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@ -13,62 +13,60 @@ var _ pilorama.Forest = (*StorageEngine)(nil)
// TreeMove implements the pilorama.Forest interface.
func (e *StorageEngine) TreeMove(d pilorama.CIDDescriptor, treeID string, m *pilorama.Move) (*pilorama.LogMove, error) {
var err error
var lm *pilorama.LogMove
for _, sh := range e.sortShardsByWeight(d.CID) {
lm, err = sh.TreeMove(d, treeID, m)
if err != nil {
if errors.Is(err, shard.ErrReadOnlyMode) || err == shard.ErrPiloramaDisabled {
return nil, err
}
e.reportShardError(sh, "can't perform `TreeMove`", err,
index, lst, err := e.getTreeShard(d.CID, treeID)
if err != nil {
return nil, err
}
lm, err := lst[index].TreeMove(d, treeID, m)
if err != nil {
if !errors.Is(err, shard.ErrReadOnlyMode) && err != shard.ErrPiloramaDisabled {
e.reportShardError(lst[index], "can't perform `TreeMove`", err,
zap.Stringer("cid", d.CID),
zap.String("tree", treeID))
continue
}
return lm, nil
return nil, err
}
return nil, err
return lm, nil
}
// TreeAddByPath implements the pilorama.Forest interface.
func (e *StorageEngine) TreeAddByPath(d pilorama.CIDDescriptor, treeID string, attr string, path []string, m []pilorama.KeyValue) ([]pilorama.LogMove, error) {
var err error
var lm []pilorama.LogMove
for _, sh := range e.sortShardsByWeight(d.CID) {
lm, err = sh.TreeAddByPath(d, treeID, attr, path, m)
if err != nil {
if errors.Is(err, shard.ErrReadOnlyMode) || err == shard.ErrPiloramaDisabled {
return nil, err
}
e.reportShardError(sh, "can't perform `TreeAddByPath`", err,
index, lst, err := e.getTreeShard(d.CID, treeID)
if err != nil {
return nil, err
}
lm, err := lst[index].TreeAddByPath(d, treeID, attr, path, m)
if err != nil {
if !errors.Is(err, shard.ErrReadOnlyMode) && err != shard.ErrPiloramaDisabled {
e.reportShardError(lst[index], "can't perform `TreeAddByPath`", err,
zap.Stringer("cid", d.CID),
zap.String("tree", treeID))
continue
}
return lm, nil
return nil, err
}
return nil, err
return lm, nil
}
// TreeApply implements the pilorama.Forest interface.
func (e *StorageEngine) TreeApply(d pilorama.CIDDescriptor, treeID string, m *pilorama.Move) error {
var err error
for _, sh := range e.sortShardsByWeight(d.CID) {
err = sh.TreeApply(d, treeID, m)
if err != nil {
if errors.Is(err, shard.ErrReadOnlyMode) || err == shard.ErrPiloramaDisabled {
return err
}
e.reportShardError(sh, "can't perform `TreeApply`", err,
zap.Stringer("cid", d.CID),
zap.String("tree", treeID))
continue
}
return nil
index, lst, err := e.getTreeShard(d.CID, treeID)
if err != nil {
return err
}
return err
err = lst[index].TreeApply(d, treeID, m)
if err != nil {
if !errors.Is(err, shard.ErrReadOnlyMode) && err != shard.ErrPiloramaDisabled {
e.reportShardError(lst[index], "can't perform `TreeApply`", err,
zap.Stringer("cid", d.CID),
zap.String("tree", treeID))
}
return err
}
return nil
}
// TreeGetByPath implements the pilorama.Forest interface.
@ -205,3 +203,27 @@ func (e *StorageEngine) TreeList(cid cidSDK.ID) ([]string, error) {
return resIDs, nil
}
// TreeExists implements the pilorama.Forest interface.
func (e *StorageEngine) TreeExists(cid cidSDK.ID, treeID string) (bool, error) {
_, _, err := e.getTreeShard(cid, treeID)
if errors.Is(err, pilorama.ErrTreeNotFound) {
return false, nil
}
return err == nil, err
}
func (e *StorageEngine) getTreeShard(cid cidSDK.ID, treeID string) (int, []hashedShard, error) {
lst := e.sortShardsByWeight(cid)
for i, sh := range lst {
exists, err := sh.TreeExists(cid, treeID)
if err != nil {
return 0, nil, err
}
if exists {
return i, lst, err
}
}
return 0, lst, pilorama.ErrTreeNotFound
}