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In this dynamodb documentation it is stated that existing items can not be updated with batch writing. However, when I try it replaces new items. How can I prevent it to update already exists one?
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A bulk (batch) update refers to updating multiple rows belonging to a single table. However, DynamoDB does not provide the support for this.
Chen's answer is correct; BatchWriteItem always overwrites.
To update an existing item in an Amazon DynamoDB table, you use the UpdateItem operation. You must provide the key of the item that you want to update. You must also provide an update expression, indicating the attributes that you want to modify and the values that you want to assign to them.
ADD - Causes DynamoDB to create an item with the supplied primary key and number (or set of numbers) for the attribute value. The only data types allowed are Number and Number Set.
As stated in the documentation if you re-put an item it replaces the old one.
Update item adds/changed attributes but doesn't remove other ones.
So basically what you are doing is replacing items and not updating them.
With batch write you can't put conditions on individual items thus you can't prevent it from updating.
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