* Split queries into system and data queries
* System queries are sequentially executed and generate separate transaction deltas
* System transaction try locks for 100ms
* last_commited_system_ts saved to DBMS durability
* Replicating CREATE/DROP DATABASE
* Sending a system snapshot if REPLICA behind
* Passing a copy of the gatekeeper::access as std::any to all functions that could call an async execution
* Removed delete_on_drop flag (we now always delete on drop)
* Using UUID as the directory name for databases
* DBMS durability update (added versioning and salient information)
* Automatic migration from previous version
* Interpreter can run some queries without a target database
* SHOW REPLICA returns the status of the currently active DB
* Returning UUID instead of db name in the RPC responses
* Using UUIDs for database specification in RPC (not name)
* FrequentCheck forces update on reconnect
* TimestampRpc will detect if a replica is behind, and will update client's state
* Safer SLK reads
* Split SHOW DATABASES in two SHOW DATABASES (list of current databases) and SHOW DATABASE a single string naming the current database
---------
Co-authored-by: Gareth Lloyd <gareth.lloyd@memgraph.io>
The DoubleToString function has been updated to handle higher precision doubles correctly. The unnecessary string length restriction has been removed, allowing the function to convert the full double value without prematurely truncating it. This change ensures that the string representation of doubles is more accurate, especially for very large or very small numbers. Unit tests have been added to verify the correct behavior for a range of double values.
* Fix up REPLICA GetInfo and CreateSnapshot
Subtle bug where these actions were using the incorrect transactional
access while in REPLICA role. This casued timestamp to be incorrectly
bumped, breaking REPLICA from doing replication.
* Delay DNS resolution
Rather than resolve at endpoint creation, we will instread resolve only
on Socket connect. This allows k8s deployments to change their IP during
pod restarts.
* Minor sonarsource fixes
---------
Co-authored-by: Andreja <andreja.tonev@memgraph.io>
Co-authored-by: DavIvek <david.ivekovic@memgraph.io>
The objects stored_node_labels_ and stored_edge_types_ can be accesses
through separate threads but it was not safe to do so. This commit
replaces the standard containers with threadsafe ones.
* Interpreter transaction ID decoupled from storage transaction ID
* Transactional scope for indices, statistics and constraints
* Storage::Accessor now has 2 modes (unique and shared)
* Introduced ResourceLock to fix pthread mutex problems
* Split InfoQuery in two: non-transactional SystemInfoQuery and transactional DatabaseInfoQuery
* Replicable and durable statistics
* Bumped WAL/Snapshot versions
* Initial implementation of the Lamport clock
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Co-authored-by: Andreja Tonev <andreja.tonev@memgraph.io>
Unique/global InterpreterContext that is Storage agnostic (has a reference to the DbmsHandler instead)
* InterpreterContext is no longer the owner of Storage
* New Database structure that handles Storage, Triggers, Streams
* Renamed SessinContextHandler to DbmsHandler and simplified the multi-tenant logic
* Added Gatekeeper and updated handlers to use it
---------
Co-authored-by: Gareth Lloyd <gareth.lloyd@memgraph.io>
It is possible for multiple read only queries to be accessing the same
sequence of vertices/edges. The reader mode of the spin lock will ensure
multiple threads can make progress at the same time.
Add timestamp to DELETE_DESERIALIZED_OBJECT delta at which this object was created.
RocksDB currently doesn't provide timestamp() functionality in iterators of TransationDB.
Because of that we are using constant "0" timestamp for DELETE_DESERIALIZED_OBJECT.
Add supernode vertex cache to account for long delta chains and modifications in the same module being independent of scanning of the nodes in the next iteration of the pulling mechanism.
* Decouple BoltSession and communication::bolt::Session
* Add CREATE/USE/DROP DATABASE
* Add SHOW DATABASES
* Cover WebSocket session
* Simple session safety implemented via RWLock
* Storage symlinks for backward. compatibility
* Extend the audit log with the DB info
* Add auth part
* Add tenant recovery
