Yes, Databricks feature tables can be stored outside of Databricks File System (DBFS). You can store your feature tables in external storage systems such as Amazon S3, Azure Blob Storage, Azure Data Lake Storage, or Hadoop Distributed File System (HDFS).
To store your feature tables in external storage, you need to configure the storage system and provide the appropriate connection information when creating your Delta table. For example, when using Amazon S3, you would specify the S3 bucket path when creating the table.
Here's an example of how to create a Delta table in an Amazon S3 bucket using PySpark:
```python
from pyspark.sql import SparkSession
# Start a Spark session
spark = SparkSession.builder \
.appName("Databricks Feature Table on S3") \
.getOrCreate()
# Define a sample DataFrame
data = [("Alice", 34), ("Bob", 45), ("Cathy", 29)]
columns = ["Name", "Age"]
df = spark.createDataFrame(data, columns)
# Write the DataFrame to a Delta table in S3
delta_table_path = "s3a://your-bucket-name/your-delta-table-path/"
df.write.format("delta").mode("overwrite").save(delta_table_path)
```
Replace `your-bucket-name` and `your-delta-table-path` with the appropriate values for your Amazon S3 bucket and desired path. Note that you need to configure your S3 authentication and ensure that you have the necessary permissions to read and write to the specified bucket.