WriteBatch

WriteBatch is a programming construct used in various data stores to collect multiple write operations into a single unit for batched execution. It is typically designed to improve efficiency by reducing network round-trips and to guarantee atomicity or all-or-nothing behavior for the included writes.

A batch usually supports operations such as create/insert, update, and delete. The operations are staged within the batch and are applied together when the batch is committed. In systems with atomic batch commits, either every operation succeeds and all changes are recorded, or none are applied.

In practice, WriteBatch is used to perform related writes together, ensuring consistency across documents or records. For example, Google Cloud Firestore provides a WriteBatch API where you add operations and call commit to apply them as a unit. Batches are subject to system-defined limits on size and the number of operations.

Implementation notes include handling of errors, partial failures, and retries; some stores allow explicit ordering of operations within a batch, while others may not. Understanding the specific semantics and limits of the underlying data store is important when using WriteBatch to ensure expected consistency and performance.