Amazon DAX Client for Python
The Amazon DAX Client for Python is used to access Amazon DAX clusters from Python. It is nearly source-compatible with Boto3, with only a small change needed to the client initialization to use DAX instead of DynamoDB. Creating a connection to your DAX cluster requires using the cluster discovery endpoint URL returned in the DescribeClusters response as the endpoint.
Install Amazon DAX Client using pip:
$ pip install amazon-dax-client
Boto3 has two different interfaces, the resource interface and the botocore client interface. Both are supported by the Amazon DAX client, with slightly different client initialization.
For the resource API, change from:
ddb = boto3.resource('dynamodb')
dax = AmazonDaxClient.resource( endpoint_url=<cluster_discovery_endpoint_url>)
All other boto3.resource() arguments are accepted.
For the botocore client API, change from:
session = botocore.session.get_session() ddb = session.create_client('dynamodb', ...)
session = botocore.session.get_session() dax = AmazonDaxClient(session, ...)
For Boto3 client API, change from:
ddb = boto3.client('dynamodb')
dax = AmazonDaxClient(endpoint_url=<cluster_discovery_endpoint_url>)
The Boto3 and botocore client APIs are exactly the same.
Hostname Verification for TLS connections is enabled by default when making requests from the client to the cluster and has no effect for unencrypted clusters. This can be turned off using the client API, be sure you understand the implication of turning it off, which is the inability to authenticate the cluster that you are connecting to.
The Amazon DAX client does not support table operations. Any table manipulation operations must use the regular Boto3 or botocore DynamoDB client.
Paginators are not currently supported for DAX.
Once created, the interface is the same as the Boto3/botocore DynamoDB clients.
For acomplete example, follow the guide to create a sample app.
Please use these community resources for getting help.
Fixes strict antlr4-python3-runtime dependency
Retry on NoMoreData error
Fixes erroneous validation error on duplicate attribute name values in ExpressionAttributeNames
Fixes botocore dependency
Encryption in transit feature
Drop support for python versions below 3.6
Retry logic bug fixes
Minor bug fixes
Updated logging to log on Logger objects
Add jitter and backoff for retryable exceptions
Fixes bug starting with clusters of less than 3 nodes.
Fixes and improvements to service discovery logic.
Add support for Python 3.8.
Fix 'RetryHandler' object has no attribute '_cluster': AttributeError problem reported in the AWS Forums.
Fix problems found by static analysis.
Fixes a bug that can result in a failure to update the roster when it changes, which can later result in a NoRouteException.
Fixes a bug that can result in an infinite loop on node failure.
Update TransactWriteItem test item limit to 25.
Adds support for transact-get-items and transact-write-items APIs for DyanamoDB transactions.
Improved efficiency of connection pooling.
Fix scheduling of background tasks.
Properly de-anonymize UnprocessedItems results from BatchWrite.
Raise a proper error if no backends are available.
Fix UpdateItem result parsing with a subset of attributes changed
Use user-specified timeouts
Fix issue with update response if the item is not changed
Fix error decoding BatchWrite UnprocessedItems.
Fix AmazonDaxClient.resource() when using batch_get_items or batch_write_items.
Fix Python 2 encoding issues
Fix decoding of ConsumedCapacity, ItemCollectionMetrics in batch operations
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