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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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7
pkg/local_object_storage/pilorama/forest.go
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@ -209,3 +209,10 @@ func (f *memoryForest) TreeList(cid cidSDK.ID) ([]string, error) {
return res, nil
}
// TreeExists implements the pilorama.Forest interface.
func (f *memoryForest) TreeExists(cid cidSDK.ID, treeID string) (bool, error) {
fullID := cid.EncodeToString() + "/" + treeID
_, ok := f.treeMap[fullID]
return ok, nil
}