awswrangler 0.0.2

Utility belt to handle data on AWS.

AWS Data Wrangler

Utility belt to handle data on AWS.

Read the documentation

---

Contents: Use Cases | Installation | Examples | Diving Deep | Contributing

---

Use Cases

Pandas

• Pandas -> Parquet (S3) (Parallel)
• Pandas -> CSV (S3) (Parallel)
• Pandas -> Glue Catalog
• Pandas -> Athena (Parallel)
• Pandas -> Redshift (Parallel)
• CSV (S3) -> Pandas (One shot or Batching)
• Athena -> Pandas (One shot or Batching)
• CloudWatch Logs Insights -> Pandas (NEW :star:)
• Encrypt Pandas Dataframes on S3 with KMS keys (NEW :star:)

PySpark

• PySpark -> Redshift (Parallel) (NEW :star:)

General

• List S3 objects (Parallel)
• Delete S3 objects (Parallel)
• Delete listed S3 objects (Parallel)
• Delete NOT listed S3 objects (Parallel)
• Copy listed S3 objects (Parallel)
• Get the size of S3 objects (Parallel)
• Get CloudWatch Logs Insights query results (NEW :star:)

Installation

pip install awswrangler

Runs only with Python 3.6 and beyond.

Runs anywhere (AWS Lambda, AWS Glue, EMR, EC2, on-premises, local, etc).

P.S. Lambda Layer bundle and Glue egg are available to download. It's just upload to your account and run! :rocket:

Examples

Pandas

Writing Pandas Dataframe to S3 + Glue Catalog

session = awswrangler.Session()
session.pandas.to_parquet(
    dataframe=dataframe,
    database="database",
    path="s3://...",
    partition_cols=["col_name"],
)

If a Glue Database name is passed, all the metadata will be created in the Glue Catalog. If not, only the s3 data write will be done.

Writing Pandas Dataframe to S3 as Parquet encrypting with a KMS key

extra_args = {
    "ServerSideEncryption": "aws:kms",
    "SSEKMSKeyId": "YOUR_KMY_KEY_ARN"
}
session = awswrangler.Session(s3_additional_kwargs=extra_args)
session.pandas.to_parquet(
    path="s3://..."
)

Reading from AWS Athena to Pandas

session = awswrangler.Session()
dataframe = session.pandas.read_sql_athena(
    sql="select * from table",
    database="database"
)

Reading from AWS Athena to Pandas in chunks (For memory restrictions)

session = awswrangler.Session()
dataframe_iter = session.pandas.read_sql_athena(
    sql="select * from table",
    database="database",
    max_result_size=512_000_000  # 512 MB
)
for dataframe in dataframe_iter:
    print(dataframe)  # Do whatever you want

Reading from S3 (CSV) to Pandas

session = awswrangler.Session()
dataframe = session.pandas.read_csv(path="s3://...")

Reading from S3 (CSV) to Pandas in chunks (For memory restrictions)

session = awswrangler.Session()
dataframe_iter = session.pandas.read_csv(
    path="s3://...",
    max_result_size=512_000_000  # 512 MB
)
for dataframe in dataframe_iter:
    print(dataframe)  # Do whatever you want

Reading from CloudWatch Logs Insights to Pandas

session = awswrangler.Session()
dataframe = session.pandas.read_log_query(
    log_group_names=[LOG_GROUP_NAME],
    query="fields @timestamp, @message | sort @timestamp desc | limit 5",
)

Typical Pandas ETL

import pandas
import awswrangler

df = pandas.read_...  # Read from anywhere

# Typical Pandas, Numpy or Pyarrow transformation HERE!

session = awswrangler.Session()
session.pandas.to_parquet(  # Storing the data and metadata to Data Lake
    dataframe=dataframe,
    database="database",
    path="s3://...",
    partition_cols=["col_name"],
)

PySpark

Loading PySpark Dataframe to Redshift

session = awswrangler.Session(spark_session=spark)
session.spark.to_redshift(
    dataframe=df,
    path="s3://...",
    connection=conn,
    schema="public",
    table="table",
    iam_role="IAM_ROLE_ARN",
    mode="append",
)

General

Deleting a bunch of S3 objects (parallel :rocket:)

session = awswrangler.Session()
session.s3.delete_objects(path="s3://...")

Get CloudWatch Logs Insights query results

session = awswrangler.Session()
results = session.cloudwatchlogs.query(
    log_group_names=[LOG_GROUP_NAME],
    query="fields @timestamp, @message | sort @timestamp desc | limit 5",
)

Diving Deep

Pandas to Redshift Flow

Spark to Redshift Flow

Contributing

• AWS Data Wrangler practically only makes integrations. So we prefer to dedicate our energy / time writing integration tests instead of unit tests. We really like an end-to-end approach for all features.

• All integration tests are between a local Docker container and a remote/real AWS service.

• We have a Docker recipe to set up the local end (testing/Dockerfile).

• We have a Cloudformation to set up the AWS end (testing/template.yaml).

Step-by-step

DISCLAIMER: Make sure to know what you are doing. This steps will charge some services on your AWS account. And requires a minimum security skills to keep your environment safe.

• Pick up a Linux or MacOS.

• Install Python 3.6+

• Install Docker and configure at least 4 cores and 8 GB of memory

• Fork the AWS Data Wrangler repository and clone that into your development environment

• Go to the project's directory create a Python's virtual environment for the project (python -m venv venv && source source venv/bin/activate)

• Run ./install-dev.sh

• Go to the testing directory

• Configure the parameters.json file with your AWS environment infos (Make sure that your Redshift will not be open for the World!)

• Deploy the Cloudformation stack ./deploy-cloudformation.sh

• Open the docker image ./open-image.sh

• Inside the image you finally can run ./run-tests.sh