Module tikv::storage::txn::commands::prewrite

Functionality for handling optimistic and pessimistic prewrites. These are separate commands (although maybe they shouldn’t be since there is only one protobuf), but handling of the commands is similar. We therefore have a single type (Prewriter) to handle both kinds of prewrite.

Structs

Optimistic	Optimistic PreWriteKind.
Pessimistic	Pessimistic PreWriteKind.
Prewrite	The prewrite phase of a transaction. The first phase of 2PC.
PrewritePessimistic	The prewrite phase of a transaction using pessimistic locking. The first phase of 2PC.
Prewriter	Handles both kinds of prewrite (K statically indicates either optimistic or pessimistic).

Constants

FORWARD_MIN_MUTATIONS_NUM

Traits

MutationLock	The type of mutation and, optionally, its extra information, differing for the optimistic and pessimistic transaction. For optimistic txns, this is Mutation. For pessimistic txns, this is (Mutation, bool), where the bool indicates whether the mutation takes a pessimistic lock or not.
PrewriteKind	Encapsulates things which must be done differently for optimistic or pessimistic transactions.

Functions

fallback_1pc_locks	Change all 1pc locks in txn to 2pc locks.
handle_1pc_locks	Commit and delete all 1pc locks in txn.
one_pc_commit_ts	Compute the commit ts of a 1pc transaction.