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Code Snippet of Lambda Function to add partitions into Glue Metadata Catalog using Boto3
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import boto3 | |
import urllib.parse | |
import os | |
import copy | |
def create_glue_partition_handler(event, context): | |
for record in event['Records']: | |
try: | |
source_bucket = record['s3']['bucket']['name'] | |
source_key = urllib.parse.unquote_plus( | |
record['s3']['object']['key'], encoding='utf-8') | |
source_file_name = os.path.basename(source_key) | |
# Extract the Glue Database and Table name from Environment Variables | |
DATABASE_NAME = os.environ['GLUE_DATABASE_NAME'] | |
TABLE_NAME = os.environ['GLUE_TABLE_NAME'] | |
# Assuming object key is folder_name/YYYY/MM/DD/HH/sample.json | |
partitions_values = source_key.split('/')[1:-1] # Remove the folder name at front and filename at the end | |
print(partitions_values) # Output: [‘YYYY’, ‘MM', ‘DD’, ‘HH'] | |
# Initialise the Glue client using Boto 3 | |
glue_client = boto3.client('glue') | |
try: | |
# Check if the partition already exists. If yes, skip adding it again | |
get_partition_response = glue_client.get_partition( | |
DatabaseName=DATABASE_NAME, | |
TableName=TABLE_NAME, | |
PartitionValues=partitions_values | |
) | |
print(‘Glue partition already exists.') | |
except Exception as e: | |
# Check if the exception is EntityNotFoundException. If yes, go ahead and create parition | |
if type(e).__name__ == 'EntityNotFoundException': | |
print('Retrieve Table Details:') | |
get_table_response = glue_client.get_table( | |
DatabaseName=DATABASE_NAME, | |
Name=TABLE_NAME | |
) | |
# Extract the existing storage descriptor and Create custom storage descriptor with new partition location | |
storage_descriptor = get_table_response['Table']['StorageDescriptor'] | |
custom_storage_descriptor = copy.deepcopy(storage_descriptor) | |
custom_storage_descriptor['Location'] = storage_descriptor['Location'] + "/".join(partitions_values) + '/' | |
# Create new Glue partition in the Glue Data Catalog | |
create_partition_response = glue_client.create_partition( | |
DatabaseName=DATABASE_NAME, | |
TableName=TABLE_NAME, | |
PartitionInput={ | |
'Values': partitions_values, | |
'StorageDescriptor': custom_storage_descriptor | |
} | |
) | |
print('Glue partition created successfully.') | |
else: | |
# Handle exception as per your business requirements | |
print(e) | |
except Exception as e: | |
# Handle exception as per your business requirements | |
print(e) |
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Found it useful. Thanks