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Andrey Saranchin authored
User is not allowed to execute TCL statements in on_commit and
on_rollback triggers - it is documented UB. However, this prohibition
can be easily overseen: one could, for example, try to rollback current
transaction if something is not OK in on_commit trigger. So let's check
if TCL statements are not executed in transactional triggers.

The commit introduces a new helper `txn_check_can_complete` - it is
required because there are cases when transaction cannot be continued
(txn_check_can_continue will return error) but it's allowed to try to
commit or rollback it. Example: when MVCC aborts a transaction due to
conflict, the result is not observed by user. So he cannot execute new
statements in the transaction, but we cannot forbid to try to commit
the transaction - only then the error will be observed and the
transaction will be actually completed (rolled back due to conflict).
But after the attempt to commit the transaction, we must forbid to
try to complete it again - it will lead to UB.

Along the way, the commit removes unnecessary check in function
`box_txn_rollback`.

Closes #7331

NO_DOC=bugfix
de80e026
History

Tarantool

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Tarantool is an in-memory computing platform consisting of a database and an application server.

It is distributed under BSD 2-Clause terms.

Key features of the application server:

Key features of the database:

  • MessagePack data format and MessagePack based client-server protocol.
  • Two data engines: 100% in-memory with complete WAL-based persistence and an own implementation of LSM-tree, to use with large data sets.
  • Multiple index types: HASH, TREE, RTREE, BITSET.
  • Document oriented JSON path indexes.
  • Asynchronous master-master replication.
  • Synchronous quorum-based replication.
  • RAFT-based automatic leader election for the single-leader configuration.
  • Authentication and access control.
  • ANSI SQL, including views, joins, referential and check constraints.
  • Connectors for many programming languages.
  • The database is a C extension of the application server and can be turned off.

Supported platforms are Linux (x86_64, aarch64), Mac OS X (x86_64, M1), FreeBSD (x86_64).

Tarantool is ideal for data-enriched components of scalable Web architecture: queue servers, caches, stateful Web applications.

To download and install Tarantool as a binary package for your OS or using Docker, please see the download instructions.

To build Tarantool from source, see detailed instructions in the Tarantool documentation.

To find modules, connectors and tools for Tarantool, check out our Awesome Tarantool list.

Please report bugs to our issue tracker. We also warmly welcome your feedback on the discussions page and questions on Stack Overflow.

We accept contributions via pull requests. Check out our contributing guide.

Thank you for your interest in Tarantool!