tarantool / tarantool / 12030532536

88%

Build Type

push

github

Committed by sergepetrenko

Commit Message

box: support asynchronous commit modes for synchronous transactions

To overcome the throughput limitation of synchronous transactions let's
allow to commit them using asynchronous wait modes (2c66624). Such
transactions will have the same consistency guarantees with
`read-confirmed` and `linearizable` isolation levels. Changes made this way
can be observable with the `read-committed` isolation level.

Currently, we return an error when the synchronous queue is full for the
only supported synchronous transaction commit mode, `complete`. However,
following the journal queue waiting logic, let's return an error only for
the `none` commit mode. Otherwise, we will wait for space in the
synchronous queue.

Asynchronously committed synchronous transactions will not get rolled back
because of `replication_synchronous_timeout`, and subsequent synchronously
committed transactions will not roll back their asynchronously committed
predecessors on timeout.

Closes #10583

@TarantoolBot document
Title: Asynchronous commit modes for synchronous transactions
Product: Tarantool
Since: 3.3
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_txn_management/commit/
and https://www.tarantool.io/ru/doc/latest/reference/reference_lua/box_txn_management/atomic/
and https://www.tarantool.io/en/doc/latest/platform/replication/repl_sync/

Some users may want to overcome the throughput limitation of synchronous
transactions and commit them using asynchronous wait modes (2c66624). This
will allow them to get the same consistency guarantees with
`read-confirmed` and `linearizable` isolation levels without paying the
throughput penalty. Changes committed this way will be visible with the
`read-committed` isolation level.

Asynchronously committed synchronous transactions will not get rolled back
because of `replication_synchronous_timeout`, and subsequent synchronously
committed transactions will not rollback their asynchronously committed
predecessors on timeout.

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