Compressed Attribute#
Overview#
Sometimes you want to compress the data before store to save DB space. For example, in an E-commerce data model, an order has many items like this: [{"item_name": "apple", "item_count": 12}, {"item_name": "banana", "item_count": 5}]. There are lots of repeated information such as the keys "item_name" and "item_count".
How it works
Internally it always serializes your data into binary, and compress it, then send to DynamoDB.
Define attribute to use Auto Compressed#
[1]:
import pynamodb_mate.api as pm
from rich import print as rprint
# Define the Data Model to use compressed attribute
class OrderModel(pm.Model):
class Meta:
table_name = f"pynamodb-mate-example-compress"
region = "us-east-1"
billing_mode = pm.constants.PAY_PER_REQUEST_BILLING_MODE
order_id = pm.UnicodeAttribute(hash_key=True)
# original value is unicode str
description = pm.attributes.CompressedUnicodeAttribute(null=True)
# original value is binary bytes
image = pm.attributes.CompressedBinaryAttribute(null=True)
# original value is any json serializable object
items = pm.attributes.CompressedJSONDictAttribute(null=True)
OrderModel.create_table(wait=True)
Write and Read the Item#
[2]:
# Create an item
order_id = "order_001"
description = "a fancy order!" * 1000
image = description.encode("utf-8") # a fake binary object
items = [
{
"item_id": "i_001",
"item_name": "apple",
"item_price": 2.4,
"quantity": 8,
},
{
"item_id": "i_002",
"item_name": "banana",
"item_price": 0.53,
"quantity": 5,
},
]
order = OrderModel(
order_id=order_id,
description=description,
image=image,
items=items,
)
# Save item to DynamoDB
order.save()
print(f"preview the DynamoDB item: {order.item_detail_console_url}")
print("you will see that the raw data in DynamoDB is compressed")
preview the DynamoDB item: https://us-east-1.console.aws.amazon.com/dynamodbv2/home?region=us-east-1#edit-item?table=pynamodb-mate-example-compress&itemMode=2&pk=order_001&sk&ref=%23item-explorer%3Ftable%3Dpynamodb-mate-example-compress&route=ROUTE_ITEM_EXPLORER
you will see that the raw data in DynamoDB is compressed
You can print the raw data in DynamoDB without using pynamodb_mate. You will see the compressed data in binary format. The original image field value is around 15KB, however, it is just 112B in DynamoDB.
[3]:
import sys
from boto_session_manager import BotoSesManager
bsm = BotoSesManager()
res = bsm.dynamodb_client.get_item(TableName=OrderModel.Meta.table_name, Key={"order_id": {"S": "order_001"}})
rprint(res["Item"])
print("image value size = {}".format(sys.getsizeof(res["Item"]["image"]["B"])))
{ 'order_id': {'S': 'order_001'}, 'description': { 'B': b'\x1f\x8b\x08\x00\x9e\x8fNf\x02\xff\xed\xc7\xb7\r\x00 \x0c\x00\xb0W\xc2i\x11e\x04)\x1b\xdf\xf3\x03\xb3\xbd9c\xe5\xee7N\x8dY-\xcd\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\ xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xbe\xf6\x00\xf5\x991\x81\xb06\x00\x00' }, 'image': { 'B': b'\x1f\x8b\x08\x00\x9e\x8fNf\x02\xff\xed\xc7\xb7\r\x00 \x0c\x00\xb0W\xc2i\x11e\x04)\x1b\xdf\xf3\x03\xb3\xbd9c\xe5\xee7N\x8dY-\xcd\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\ xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xbe\xf6\x00\xf5\x991\x81\xb06\x00\x00' }, 'items': { 'B': b'\x1f\x8b\x08\x00\x9e\x8fNf\x02\xff\x8b\xaeV\xca,I\xcd\x8d\xcfLQ\xb2RP\xca\x8c700T\xd2Q\x80\x88\xe5%\xe6\xa6\x82D\ x13\x0b\nrR\xe1\xa2\x05E\x99\xc9 a#=\x13\xa0Paib^IfI%P\xc0\xa2VG\x01\xc34#\x0c\xd3\x92\x12\xf3\x80\x10\xc38\x03=ScT\xf3Lkc\x01I\x1e\xcf\x15\x9e\x00\ x00\x00' } }
image value size = 112
When you get the value using ORM, you get the raw value.
[4]:
# Get the value back and verify
order = OrderModel.get(order_id)
rprint(order.to_dict())
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order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!', 'image': b'a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy order!a fancy 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