Emir Karamehmetoglu
03/12/2024, 11:48 AMScout
03/12/2024, 11:48 AMDefinitions
object to use either the FilesystemIOManager
or the S3PickleIOManager
. Here's an example of how you might set up your `Definitions.py`: python from dagster import Definitions, asset from dagster_aws.s3 import S3PickleIOManager, S3Resource from dagster import fs_io_manager # Assume 'storage_system' is the variable that can be 's3' or 'fs' storage_system = 's3' # or 'fs' # Define your assets @asset def my_asset(): # Your asset logic here return "data" # Configure resources based on the storage_system variable if storage_system == 's3': # Configure S3 resources and IO manager resources = { "io_manager": S3PickleIOManager( s3_resource=S3Resource(), s3_bucket="my-bucket" ), } elif storage_system == 'fs': # Use the filesystem IO manager resources = { "io_manager": fs_io_manager, } else: raise ValueError("Invalid storage system specified") # Create the Definitions object with the configured resources defs = Definitions( assets=[my_asset], resources=resources, )
In this example, we first define an asset called my_asset
. Then, based on the value of the storage_system
variable, we conditionally configure the resources dictionary to use either the S3PickleIOManager
or the fs_io_manager
. Finally, we create a Definitions
object with the assets and the configured resources. Please note that you need to replace "my-bucket"
with the actual name of your S3 bucket if you're using S3. Additionally, ensure that you have the necessary permissions and configurations set up for accessing the S3 bucket or the filesystem as required.Emir Karamehmetoglu
03/12/2024, 11:51 AMfs_io_manager
not using the deprecated syntax, and should I not use an IOManager class instead?Scout
03/12/2024, 11:51 AMfs_io_manager
is a built-in IO manager provided by Dagster for managing file system-based inputs and outputs. It is not deprecated and is the correct way to attach a file system IO manager to your pipeline or asset as a resource. The example provided earlier uses the fs_io_manager
correctly for the file system case. However, if you are referring to the transition from the older storage
and intermediate_storage
configurations to the newer IO manager-based approach, then yes, you should use the IO manager API. The fs_io_manager
is part of this newer approach and is an instance of IOManager
that is configured to work with the local filesystem. Here's an updated example that uses the fs_io_manager
correctly: python from dagster import asset, fs_io_manager, ResourceDefinition from dagster_aws.s3 import s3_pickle_io_manager # Assume 'storage_system' is the variable that can be 's3' or 'fs' storage_system = 's3' # or 'fs' # Define your assets @asset def my_asset(): # Your asset logic here return "data" # Configure resources based on the storage_system variable if storage_system == 's3': # Configure S3 IO manager resources = { "io_manager": s3_pickle_io_manager.configured({'s3_bucket': 'my-bucket'}), } elif storage_system == 'fs': # Use the filesystem IO manager resources = { "io_manager": fs_io_manager, } else: raise ValueError("Invalid storage system specified") # Create a resource definition with the configured resources resource_defs = {key: ResourceDefinition.hardcoded_resource(value) for key, value in resources.items()}
In this example, we use the configured
method to configure the s3_pickle_io_manager
with the S3 bucket name. The fs_io_manager
is used as is for the file system case. The resource_defs
dictionary is then created with the configured resources, which can be attached to your pipeline or asset definitions. Please ensure that you have the necessary dependencies installed for using S3, such as dagster-aws
, and that you have correctly configured your AWS credentials.Emir Karamehmetoglu
03/12/2024, 11:52 AMFileSystemIOManager
or PickledObjectFilesystemIOManager
?Scout
03/12/2024, 11:52 AMFileSystemIOManager
or PickledObjectFilesystemIOManager
. Instead, you should use the fs_io_manager
, which is the built-in IO manager provided by Dagster for managing file system-based inputs and outputs. The fs_io_manager
is the recommended way to handle file system IO in Dagster, and it is designed to work with the modern asset-based APIs. The fs_io_manager
is an instance of IOManager
that is pre-configured to read from and write to the local filesystem, and it handles the serialization and deserialization of objects using Python's pickle module. It is part of Dagster's core library and is maintained to be compatible with the latest versions of Dagster. For S3, you should use the s3_pickle_io_manager
, which is specifically designed for working with AWS S3 and handles the pickling and unpickling of objects stored in S3 buckets. Here's a brief example of how you would use these IO managers: python from dagster import asset, fs_io_manager from dagster_aws.s3 import s3_pickle_io_manager # Assume 'storage_system' is the variable that can be 's3' or 'fs' storage_system = 's3' # or 'fs' # Define your assets @asset def my_asset(): # Your asset logic here return "data" # Configure resources based on the storage_system variable if storage_system == 's3': # Configure S3 IO manager resources = { "io_manager": s3_pickle_io_manager.configured({'s3_bucket': 'my-bucket'}), } elif storage_system == 'fs': # Use the filesystem IO manager resources = { "io_manager": fs_io_manager, } else: raise ValueError("Invalid storage system specified") # The resources dictionary can be used to configure your asset or pipeline definitions
In this example, the resources
dictionary is configured based on the storage_system
variable, and it can be used to attach the appropriate IO manager to your assets or pipelines. Remember to replace 'my-bucket'
with your actual S3 bucket name and ensure that your AWS credentials are set up correctly if you're using S3.Emir Karamehmetoglu
03/12/2024, 11:54 AMS3PickleIOManager
?Scout
03/12/2024, 11:54 AMS3PickleIOManager
. This IO manager is designed for use with AWS S3 and handles the serialization and deserialization of objects using Python's pickle module, storing them in an S3 bucket. Here's an example of how you would configure the S3PickleIOManager
for use with your assets: python from dagster import asset, ResourceDefinition from dagster_aws.s3 import S3PickleIOManager, s3_resource # Define your assets @asset def my_asset(): # Your asset logic here return "data" # Configure S3 IO manager s3_pickle_io_manager = S3PickleIOManager( s3_bucket="my-bucket", s3_prefix="my-prefix", # Optional: specify a prefix within the bucket s3_resource=s3_resource, # Pass the s3_resource configured with your AWS credentials ) # Create a resource definition with the S3PickleIOManager resource_defs = { "io_manager": ResourceDefinition.hardcoded_resource(s3_pickle_io_manager), } # The resource_defs dictionary can be used to configure your asset or pipeline definitions
In this example, the s3_pickle_io_manager
is configured with a bucket name and an optional prefix. The s3_resource
should be configured with your AWS credentials and any other necessary settings for accessing S3. Please ensure that you have the necessary dependencies installed, such as dagster-aws
, and that your AWS credentials are correctly configured for accessing the S3 bucket.Emir Karamehmetoglu
03/12/2024, 11:56 AMFilesystemIOManager
, where I don't have to provide the base_dir
Scout
03/12/2024, 11:57 AMFilesystemIOManager
is a built-in IO manager in Dagster that stores and retrieves values from the local filesystem. If you don't provide a base_dir
, it will use the default local filesystem path to store the outputs. Here's an example of how you can use the FilesystemIOManager
without specifying a `base_dir`: python from dagster import asset, IOManager, io_manager from dagster.core.storage.files_manager import FilesystemFileHandle, LocalFileHandle class FilesystemIOManager(IOManager): def handle_output(self, context, obj): # Here you would implement the logic to write your object to the filesystem # For example, if `obj` is a pandas DataFrame: # obj.to_csv(context.get_output_path()) # If you're just writing a string to a file, it could be as simple as: with open(context.get_output_path(), "w") as file: file.write(obj) def load_input(self, context): # Here you would implement the logic to read your object from the filesystem # For example, if you're reading a CSV into a pandas DataFrame: # return pandas.read_csv(context.upstream_output.get_path()) # If you're just reading a string from a file, it could be as simple as: with open(context.upstream_output.get_path(), "r") as file: return file.read() @io_manager def my_filesystem_io_manager(_): return FilesystemIOManager() # Define your assets @asset(io_manager_key="my_filesystem_io_manager") def my_asset(): # Your asset logic here return "data" # The my_filesystem_io_manager can be used to configure your asset or pipeline definitions
In this example, we define a custom FilesystemIOManager
that uses the context.get_output_path()
method to determine where to write the output. This method will automatically generate a file path based on the asset's name and the run ID. Since we don't specify a base_dir
, it will default to a directory within Dagster's managed storage. The my_filesystem_io_manager
is a factory function decorated with @io_manager
that returns an instance of our custom FilesystemIOManager
. This function is used to create an IO manager resource that can be associated with our asset my_asset
using the io_manager_key
parameter. Please note that the handle_output
and load_input
methods should be implemented according to the specific data types you are working with. The examples provided here are for illustrative purposes and show simple read/write operations for string data. If you are working with more complex data types, such as pandas DataFrames, you would need to use the appropriate read/write methods for those types.Emir Karamehmetoglu
03/12/2024, 11:59 AMFilesystemIOManager
which is found in dagster/_core/stoage/fs_io_manager.py
Scout
03/12/2024, 11:59 AMFilesystemIOManager
provided by Dagster, you don't need to define a custom class or provide a base_dir
. The FilesystemIOManager
will use the default local filesystem path to store outputs if no base_dir
is specified. Here's an example of how to use the built-in FilesystemIOManager
with your assets: python from dagster import asset, fs_io_manager # Define your assets @asset(io_manager_key="fs_io_manager") def my_asset(): # Your asset logic here return "data" # The fs_io_manager can be used to configure your asset or pipeline definitions
In this example, we use the fs_io_manager
directly with the @asset
decorator by specifying the io_manager_key
. The fs_io_manager
is a pre-configured instance of FilesystemIOManager
that is included with Dagster, and it will manage the storage of asset outputs on the local filesystem. When you run this asset within a Dagster job, the output will be stored in the local filesystem at a path determined by Dagster's execution context. You don't need to provide any additional configuration for the FilesystemIOManager
unless you want to customize the storage behavior, such as specifying a different base directory.Emir Karamehmetoglu
03/12/2024, 12:00 PMScout
03/12/2024, 12:01 PMfs_io_manager
in your Definitions.py
, you can define a Definitions
object and specify the fs_io_manager
as the resource for the "io_manager" key. Here's how you can do it: python from dagster import Definitions, fs_io_manager, asset # Define your assets @asset def my_asset(): # Your asset logic here return "data" # Define the resources, explicitly setting the "io_manager" to the default fs_io_manager resources = { "io_manager": fs_io_manager } # Create the Definitions object with the configured resources defs = Definitions( assets=[my_asset], resources=resources, ) # Now, defs contains your asset definitions and the default filesystem IO manager
In this example, we create a resources
dictionary that maps the "io_manager" key to the fs_io_manager
. Then, we pass this dictionary to the Definitions
object along with the list of assets. This setup ensures that the default filesystem IO manager is used for all assets unless otherwise specified.Emir Karamehmetoglu
03/12/2024, 12:02 PMfs_io_manager.configured
or will dagster configure the IO manager based on $DAGSTER_HOME
and what is specified in dagster.yaml
Scout
03/12/2024, 12:02 PM