My requirement is to use python script to read data from AWS Glue Database into a dataframe. When I researched I fought the library - "awswrangler". I'm using the below code to connect and read data:
import awswrangler as wr
profile_name = 'aws_profile_dev'
REGION = 'us-east-1'
#Retreiving credentials to connect to AWS
ACCESS_KEY_ID, SECRET_ACCESS_KEY,SESSION_TOKEN = get_profile_credentials(profile_name)
session = boto3.session.Session(
aws_access_key_id=ACCESS_KEY_ID,
aws_secret_access_key=SECRET_ACCESS_KEY,
aws_session_token=SESSION_TOKEN
)
my_df= wr.athena.read_sql_table(table= 'mytable_1', database= 'shared_db', boto3_session=session)
However, when I'm running the above code, I'm getting the following error - "ValueError: year 0 is out of range"
Alternatively, I tried using another library - "pyathena". The code I'm trying to use is:
from pyathena import connect
import pandas as pd
conn = connect(aws_access_key_id=ACCESS_KEY_ID,
aws_secret_access_key=SECRET_ACCESS_KEY,
aws_session_token=SESSION_TOKEN,
s3_staging_dir='s3://my-sample-bucket/',
region_name='us-east-1')
df = pd.read_sql("select * from AwsDataCatalog.shared_db.mytable_1 limit 1000", conn)
Using this, I'm able to retrieve data, but it works only if I'm using limit. i.e.., If I'm just running query without limit i.e.., "select * from AwsDataCatalog.shared_db.mytable_1", it's giving the error - ValueError: year 0 is out of range
Weird behavior - For example, If I run:
df = pd.read_sql("select * from AwsDataCatalog.shared_db.mytable_1 limit 1200", conn)
sometimes it's giving the same error, and if I simply reduce the limit value and run (for example as limit 1199), and later again when I run it back with limit 1200 it works. But this doesn't work if I'm trying to read more than ~1300 rows. I have a total 2002 rows in the table. I need to read the entire table.
Please help! Thank you!
I have found a way using awswrangler to query data directly from Athena into pandas dataframe on your local machine. This doesn't require us to provide output location on S3.
profile_name = 'Dev-AWS'
REGION = 'us-east-1'
#this automatically retrieves credentials from your aws credentials file after you run aws configure on command-line
ACCESS_KEY_ID, SECRET_ACCESS_KEY,SESSION_TOKEN = get_profile_credentials(profile_name)
session = boto3.session.Session(
aws_access_key_id=ACCESS_KEY_ID,
aws_secret_access_key=SECRET_ACCESS_KEY,
aws_session_token=SESSION_TOKEN
)
wr.athena.read_sql_query("select * from table_name", database="db_name", boto3_session=session)
Alternatively, if you don't want to query Athena, but want to read entire glue table, you can use:
my_df = wr.athena.read_sql_table(table= 'my_table', database= 'my_db', boto3_session=session)