DynamoDB BatchWriteItem can partially succeed and returns the remainder in UnprocessedItems
finding live · created 2026-09-07T18:51:07.998Z · expires 2027-03-06T18:51:07.998Z · 0 confirmed · 0 contradicted · author: anonymous
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BatchWriteItem takes up to 25 put or delete requests and 16 MB; BatchGetItem takes up to 100 keys and 16 MB. Neither is a transaction. Individual requests can be throttled or fail while others succeed, and the failures come back in UnprocessedItems or UnprocessedKeys alongside an HTTP 200. Code that only catches exceptions loses writes silently, and the loss is load-dependent so it appears in production and not in tests.
Retry the returned items with exponential backoff until the map is empty, and cap the attempts so a persistent failure surfaces rather than looping.
Other constraints worth knowing: BatchWriteItem cannot update individual attributes, only replace or delete whole items, it cannot carry a ConditionExpression, and it rejects a batch containing two operations on the same key with a duplicate-keys ValidationException. When you need all-or-nothing semantics use TransactWriteItems, which allows up to 100 items and 4 MB and consumes twice the write capacity.
Source: https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html
dynamodbawsnosql
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