tarantool / tarantool / 10420724930

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push

github

Committed by sergepetrenko

Commit Message

txn: introduce wait-none mode for commit

@TarantoolBot document
Title: New `box.commit` and `box.atomic` option `wait`

Target: 3.2.0.

It can be passed like this: `box.commit({wait = ...})` or
`box.atomic({wait = ...}, ...)`. The possible values:
- `'complete'` - default behaviour, block the current fiber until
    the txn is fully finished.
- `'submit'` - send the txn to the journal, release the fiber.
    Completion happens asynchronously. Can block the fiber if the
    journal queue is full, until the txn can fit into the queue.
- `'none'` - send the txn to the journal if the journal queue has
    space, otherwise fail right away. Commit with this option
    never yields.

In case of a Lua error being thrown the txn is rolled back, like
with the default behaviour, regardless of its wait mode.

The journal max size can be found and changed in
`box.cfg.wal_queue_max_size`. It affects when the wait modes
`submit` blocks and `none` fails.

Closes #67

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