Commit graph

12 commits

Author SHA1 Message Date
Evgenii Stratonikov
71b87155ef [] *: use stdlib errors package
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2021-05-19 16:42:54 +03:00
Evgenii Stratonikov
62b8958177 [] blobstor: check for blobovnicza without mutex first
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2021-04-29 17:36:36 +03:00
Evgenii Stratonikov
de74fcc38f [] blobstor: use simplelru.LRU cache
Evicting from cache requires closing blobovnicza which
in turn needs to lock `activeMtx`. This lock is not needed on
every addition, but our LRU library doesn't return evicted keys.
In future we may consider switching to other implementation.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2021-04-21 14:41:34 +03:00
Alex Vanin
5e231c515a [] Fix whitespace linter errors
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
2021-01-12 18:47:02 +03:00
Alex Vanin
e6f2d84736 [] blobovnivza: Fix deadlock on concurrent evict and open new blobovnicza
Deadlock occurs when `getActivate` function opens new blobovnicza and that
invokes evict in LRU cache of open blobovniczas. `getActivate` makes
`activeMtx.Lock()` and then cache evict makes `activeMtx.RLock()` and deadlock
happens.

Fix contains two steps:
- add separate mutex to open blobovniczas (1),
- split single Lock outside of `updateAndGet` (2).

As for the (1) `bbolt.Open()` locks when it tries to open the same file from
two threads. So separate mutex will prevent that.

As for the (2) `updateAndGet` function contains from two parts. At first it
checks if required blobovnicza is ready and it returns it. In this case we can
use the simple RLock. But then there is an option when we should open new
blobovnicza and update map of active blobovniczas.

In this case we call `openBlobovnicza` without activeMtx lock. Cache evict
happens there and it won't cause deadlock.

Then we lock activeMtx to update the map of active blobovniczas. Concurrency can
happen there. However `openBlobovnicza` will not open the same blobovnicza twice,
so we can make one more check if opened blobovnicza was activated while thread was
locked in activeMtx. If so, then return active blobovnicza, else finish activation.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>
2020-12-14 13:37:45 +03:00
Leonard Lyubich
9dd83bdf0d [] blobstor: Return object.ErrRangeOutOfBounds from shallow dir
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00
Leonard Lyubich
eaae5a5dd7 [] blobovnicza: Store objects in a binary format
In previous implementation Blobovnicza's stored objects in protocol format
which did not allow working with externally compressed objects. To achieve
this goal, operations Get and Put no longer work with the structure of the
object, but only with abstract binary data. Operation GetRange has become
incorrect in its original purpose to receive the payload range. In this
regard, BlobStor receives the payload range of the object through Get
operation. In the future either Blobovnicza will learn to compress objects
by itself, or the GetRange operation will be eliminated.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00
Leonard Lyubich
47d2239332 [] localstorage: Replace basic errors to core library
Replace ErrNotFound and ErrRangeOutOfBounds to core/object package in order
to share them across the libraries.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00
Leonard Lyubich
7f20e6f9db [] blobstor: Implement GetRange on blobovnicza tree
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00
Leonard Lyubich
51ab6991d2 [] blobstor: Implement method to close blobovnicza tree
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00
Leonard Lyubich
34a259d5c0 [] blobstor: Support zero shallow depth of blobovnicza tree
There is a need to support single blobovnicza in blobovnicza tree. This can
be achieved with a width of 1, and a depth of 0 or 1. With depth = 1 one
redundant directory is created, inside which there is a blobovnicza. If the
depth is zero, the blobobnivza will be in the root path. Fix negative
capacity in iterateDeepest method with zero depth.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00
Leonard Lyubich
4c3d231e82 [] blobstor: Implement blobovnicza tree
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00