Write to Azure Blob Storage

This guide shows you how to create an Azure Blob Storage Write Component.

Prerequisites

• Azure Blob Storage Connection with write permissions
• An Ascend Flow with a Component that contains data

Create a new Write Component

Begin from your workspace Super Graph view. Follow these steps to create your Write Component:

Using the Component Form

1. Double-click the Flow where you want to create your component
2. Right-click on any Component
3. Hover over Create Downstream -> Write, and select your target Connection
4. Complete the form with these details:
   • Select your Flow
   • Enter a descriptive Component Name like write_mysql

Using the Files Panel

1. Open the Files panel in the top left corner
2. Navigate to and select your desired Flow
3. Right-click on the components directory and choose New file
4. Name your file with a descriptive name like write_mysql.yaml and press enter

Configure your Azure Blob Storage Write Component

Follow these steps to set up your Azure Blob Storage Write Component:

1. Configure your Connection
   • Enter your Azure Blob Storage Connection name in the connection field
2. Specify a data source
   • Set input to the Component that contains your source data
3. Define the write target
   • Configure the abfs write connector options
   • Specify your target table name, schema, and other required properties
4. Select a write strategy

   Choose one of these strategies based on your use case:

   Strategy	Description	Best For
   partitioned	Updates only modified partitions	Time-series data, regional datasets, date-partitioned data
   full	Replaces entire target during each Flow Run	Reference tables, complete data refreshes
   snapshot	Flexible output - single file or chunked based on path	Data exports, analytical datasets, flexible output requirements

For complete details on output format options and when to use each approach, see the write output formats guide.

Examples

Choose the write strategy that best fits your use case:

Full write strategy

This example shows an Azure Blob Storage Write Component that uses a full write strategy. Full writes now produce chunked output for better performance with large datasets.

full_azure.yaml

component:
  write:
    connection: write_abfss
    input:
      name: my_component
      flow: my_flow
    strategy: snapshot
    abfs:
      path: /some-other-dir/my_data.parquet
      formatter: parquet

Output: Multiple files like part_001.parquet, part_002.parquet, etc. in the specified directory.

Snapshot (chunked)

This example shows an Azure Blob Storage Write Component using snapshot strategy with chunked output. The path ends with a trailing slash (/), producing multiple chunk files.

write_azure_snapshot.yaml

component:
  write:
    connection: write_abfss
    input:
      name: my_component
      flow: my_flow
    strategy: snapshot
    abfs:
      path: /snapshot_data/
      formatter: parquet

Output: Multiple files like part_001.parquet, part_002.parquet, etc. in the /snapshot_data/ directory.

Snapshot (single file)

This example shows an Azure Blob Storage Write Component using snapshot strategy with single file output. The path ends with a specific filename and extension.

write_azure_snapshot_single.yaml

component:
  write:
    connection: write_abfss
    input:
      name: my_component
      flow: my_flow
    strategy: snapshot
    abfs:
      path: /snapshot_data/my_snapshot.parquet
      formatter: parquet

Output: A single file named my_snapshot.parquet in the /snapshot_data/ directory.

🎉 Congratulations! You successfully created an Azure Blob Storage Write Component in Ascend.