DynamoDB BatchWriteItem

[alanp]

Hi Mitch
When will we see it in Boto?
Thanks
Alan

[Mitchell Garnaat]

Just committed an initial version.  Let me know what you think or if you need more info to get started with it.

Mitch

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[Alan Pound]

Thanks Mitch - I'll have a look at it on Monday.
Alan

[egottschalk]

Hi Mitch,

I noticed that BatchWriteItem will throw an exception with duplicate keys:

item1 = table.new_item("a", { "message" : "message for key a" })

item2 = table.new_item("a", { "message" : "new message for key a" })

batch_list = c.new_batch_write_list()

batch_list.add_batch(table, puts=[item1, item2])

response = batch_list.submit()

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/Library/Python/2.6/site-packages/boto-2.3.0-py2.6.egg/boto/dynamodb/batch.py", line 194, in submit

    return self.layer2.batch_write_item(self)

  File "/Library/Python/2.6/site-packages/boto-2.3.0-py2.6.egg/boto/dynamodb/layer2.py", line 439, in batch_write_item

    object_hook=item_object_hook)

  File "/Library/Python/2.6/site-packages/boto-2.3.0-py2.6.egg/boto/dynamodb/layer1.py", line 330, in batch_write_item

    object_hook=object_hook)

  File "/Library/Python/2.6/site-packages/boto-2.3.0-py2.6.egg/boto/dynamodb/layer1.py", line 133, in make_request

    retry_handler=self._retry_handler)

  File "/Library/Python/2.6/site-packages/boto-2.3.0-py2.6.egg/boto/connection.py", line 746, in _mexe

    status = retry_handler(response, i, next_sleep)

  File "/Library/Python/2.6/site-packages/boto-2.3.0-py2.6.egg/boto/dynamodb/layer1.py", line 165, in _retry_handler

    data)

boto.exception.DynamoDBResponseError: DynamoDBResponseError: 400 Bad Request

{u'message': u'Provided list of item keys contains duplicates', u'__type': u'com.amazon.coral.validate#ValidationException'}

The single writes meanwhile work fine:

item1.put()

item2.put()

Is this expected behavior?

Thanks,

Eric

[Mitchell Garnaat]

Hi -

The error is coming directly from DynamoDB so I think that's a restriction of the BatchWriteItem request.  I could probably check that on the client-side although I generally tend to let those type of errors come directly from the service.

Mitch

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