As per http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html dynamodb does not support batchupdate only batchwrite/put is supported . But DynamoDBMapper supports batchWrite with a behaviour of UPDATE_SKIP_NULL_ATTRIBUTES. Does it mean internally mapper calls single single update instead of batchupdate for UPDATE_SKIP_NULL_ATTRIBUTES ?
1 Answers
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When you use BatchWrite, it replaces the existing items(Not update). Even if you use DynamoDBMapper, the functionality should be the same.
According to the DynamoDBMapper source code, SaveBehavior with UPDATE_SKIP_NULL_ATTRIBUTES, it ultimately calls BatchWriteItemRequest iteratively in 25 batch size, which replaces the existing items.
Check the following statement in AWS Class Reference Documentation.
NOTE: BatchWriteItem cannot update items. To update items, use the UpdateItem API.
