วิธีใช้ Boto3 แบ่งหน้า (Paginate) ผ่าน Crawlers ทั้งหมดใน AWS Glue

ข้อกำหนดปัญหา: ใช้ไลบรารี boto3 ใน Python เพื่อแบ่งหน้าผ่าน crawlers ทั้งหมดจาก AWS Glue Data Catalog

ขั้นตอนการแก้ปัญหา

• ขั้นตอน 1: นำเข้า boto3 และ botocore.exceptions

• ขั้นตอน 2: พารามิเตอร์เลือกได้: max_items, page_size, starting_token

  • max_items: จำนวนระเบียนสูงสุด
  • page_size: ขนาดแต่ละหน้า
  • starting_token: ใช้ NextToken จาก response ก่อนหน้า

• ขั้นตอน 3: สร้าง AWS session ด้วย boto3 พร้อมระบุ region_name

• ขั้นตอน 4: สร้าง AWS client สำหรับ glue

• ขั้นตอน 5: สร้าง paginator object ด้วย get_crawlers

• ขั้นตอน 6: เรียก paginate พร้อมส่ง PaginationConfig

• ขั้นตอน 7: คืนค่าระเบียนตาม max_items และ page_size

• ขั้นตอน 8: จัดการข้อยกเว้นทั่วไป

โค้ดตัวอย่าง

import boto3
from botocore.exceptions import ClientError

def paginate_through_crawlers(max_items=None, page_size=None, starting_token=None):
    session = boto3.session.Session()
    glue_client = session.client('glue')
    try:
        paginator = glue_client.get_paginator('get_crawlers')
        response = paginator.paginate(
            PaginationConfig={
                'MaxItems': max_items,
                'PageSize': page_size,
                'StartingToken': starting_token
            }
        )
        return response
    except ClientError as e:
        raise Exception("boto3 client error in paginate_through_crawlers: " + e.__str__())
    except Exception as e:
        raise Exception("Unexpected error in paginate_through_crawlers: " + e.__str__())

# 1st Run
a = paginate_through_crawlers(3, 5)
print(*a)

# 2nd Run
for items in a:
    next_token = items['NextToken']
    b = paginate_through_crawlers(3, 5, next_token)
    print(*b)

ผลลัพธ์

#1st Run
{'Crawlers': [{'Name': 'DailyTest_v1.01', 'Role': 'ds-dev', 'Targets': {'S3Targets': [{'Path': 's3://**************/UIT_Raw/', 'Exclusions': []}], 'JdbcTargets': [], 'DynamoDBTargets': [], 'CatalogTargets': []}, 'DatabaseName': 'default', 'Classifiers': [], 'SchemaChangePolicy': {'UpdateBehavior': 'UPDATE_IN_DATABASE', 'DeleteBehavior': 'DEPRECATE_IN_DATABASE'}, 'State': 'READY', 'TablePrefix': 'test_uit_', 'CrawlElapsedTime': 0, 'CreationTime': datetime.datetime(2020, 11, 23, 17, 50, 20, tzinfo=tzlocal()), 'LastUpdated': datetime.datetime(2020, 12, 11, 18, 22, 34, tzinfo=tzlocal()), 'LastCrawl': {'Status': 'SUCCEEDED', 'LogGroup': '/aws-glue/crawlers', 'LogStream': '01_DailySalesAsOff_v1.01', 'MessagePrefix': '71fc0485-4755-42ca-a208-0654dd84d011', 'StartTime': datetime.datetime(2020, 12, 11, 18, 54, 46, tzinfo=tzlocal())}, 'Version': 10}, {'Name': 'Client_list', 'Role': 'ds-dev', 'Targets': {'S3Targets': [{'Path': 's3://************Client_list_01072021/', 'Exclusions': []}], 'JdbcTargets': [], 'DynamoDBTargets': [], 'CatalogTargets': []}, 'DatabaseName': 'ds_adhoc', 'Classifiers': [], 'SchemaChangePolicy': {'UpdateBehavior': 'UPDATE_IN_DATABASE', 'DeleteBehavior': 'DEPRECATE_IN_DATABASE'}, 'State': 'READY', 'CrawlElapsedTime': 0, 'CreationTime': datetime.datetime(2021, 1, 8, 3, 52, 27, tzinfo=tzlocal()), 'LastUpdated': datetime.datetime(2021, 1, 8, 3, 52, 27, tzinfo=tzlocal()), 'LastCrawl': {'Status': 'SUCCEEDED', 'LogGroup': '/aws-glue/crawlers', 'LogStream': 'Client_list_01072021', 'MessagePrefix': '41733a73-8946-4906-969c-f9581237b833', 'StartTime': datetime.datetime(2021, 1, 8, 3, 52, 45, tzinfo=tzlocal())}, 'Version': 1}, {'Name': 'Data Dimension', 'Role': 'qa-edl-glue-role', 'Targets': {'S3Targets': [{'Path': 's3://**************/data_dimension', 'Exclusions': []}], 'JdbcTargets': [], 'DynamoDBTargets': [], 'CatalogTargets': []}, 'DatabaseName': 'qa_edl_glue_database', 'Classifiers': [], 'SchemaChangePolicy': {'UpdateBehavior': 'UPDATE_IN_DATABASE', 'DeleteBehavior': 'DEPRECATE_IN_DATABASE'}, 'State': 'READY', 'CrawlElapsedTime': 0, 'CreationTime': datetime.datetime(2020, 8, 12, 0, 36, 21, tzinfo=tzlocal()), 'LastUpdated': datetime.datetime(2021, 3, 28, 13, 21, 19, tzinfo=tzlocal()), 'LastCrawl': {'Status': 'SUCCEEDED', 'LogGroup': '/aws-glue/crawlers', 'LogStream': 'Data Dimension', 'MessagePrefix': 'ee09c0ac-b778-467e-a941-c86c37edde47', 'StartTime': datetime.datetime(2021, 3, 28, 14, 1, 50, tzinfo=tzlocal())}, 'Version': 11}], 'NextToken': 'crawlr-wells', 'ResponseMetadata': {'RequestId': '8a6114ec-************d66', 'HTTPStatusCode': 200, 'HTTPHeaders': {'date': 'Fri, 02 Apr 2021 11:00:17 GMT', 'content-type': 'application/x-amz-json-1.1', 'content-length': '86627', 'connection': 'keep-alive', 'x-amzn-requestid': '8a6114ec-*****************66'}, 'RetryAttempts': 0}}

#2nd Run
{'Crawlers': [{'Name': 'crwlr-cw-etf', 'Role': 'dev-ds-glue-role', 'Targets': {'S3Targets': [{'Path': 's3://***********CW_2020Q3', 'Exclusions': []}], 'JdbcTargets': [], 'DynamoDBTargets': [], 'CatalogTargets': []}, 'DatabaseName': 'ivz-dev-ds-data-packs', 'Description': 'Data pack crawlers', 'Classifiers': [], 'SchemaChangePolicy': {'UpdateBehavior': 'UPDATE_IN_DATABASE', 'DeleteBehavior': 'DEPRECATE_IN_DATABASE'}, 'State': 'READY', 'CrawlElapsedTime': 0, 'CreationTime': datetime.datetime(2020, 10, 28, 17, 30, 41, tzinfo=tzlocal()), 'LastUpdated': datetime.datetime(2020, 11, 17, 12, 47, 21, tzinfo=tzlocal()), 'LastCrawl': {'Status': 'SUCCEEDED', 'LogGroup': '/aws-glue/crawlers', 'LogStream': 'crwlr-cw-etf', 'MessagePrefix': '49cb001f-3005-43ef-96f7-a1d45917c808', 'StartTime': datetime.datetime(2020, 11, 17, 17, 41, 16, tzinfo=tzlocal())}, 'Version': 5, 'Configuration': '{"Version":1.0,"Grouping":{"TableGroupingPolicy":"CombineCompatibleSchemas"}}'}, {'Name': 'crwlr-data-packs', 'Role': 'dev-ds-glue-role', 'Targets': {'S3Targets': [{'Path': 's3://*****************raw-parquet', 'Exclusions': []}], 'JdbcTargets': [], 'DynamoDBTargets': [], 'CatalogTargets': []}, 'DatabaseName': 'ivz-dev-ds-data-packs', 'Classifiers': [], 'SchemaChangePolicy': {'UpdateBehavior': 'UPDATE_IN_DATABASE', 'DeleteBehavior': 'DEPRECATE_IN_DATABASE'}, 'State': 'READY', 'CrawlElapsedTime': 0, 'CreationTime': datetime.datetime(2020, 4, 21, 20, 49, 6, tzinfo=tzlocal()), 'LastUpdated': datetime.datetime(2020, 4, 21, 20, 49, 6, tzinfo=tzlocal()), 'LastCrawl': {'Status': 'SUCCEEDED', 'LogGroup': '/aws-glue/crawlers', 'LogStream': 'crwlr-data-packs-mstr', 'MessagePrefix': '26aedfe8-f631-41e3-acd5-35877d71be1b', 'StartTime': datetime.datetime(2020, 4, 21, 20, 49, 10, tzinfo=tzlocal())}, 'Version': 1, 'Configuration': '{"Version":1.0,"Grouping":{"TableGroupingPolicy":"CombineCompatibleSchemas"}}'}, {'Name': 'crwlr-data-packs', 'Role': 'dev-ds-glue-role', 'Targets': {'S3Targets': [{'Path': 's3://******ubs-raw-parquet', 'Exclusions': []}], 'JdbcTargets': [], 'DynamoDBTargets': [], 'CatalogTargets': []}, 'DatabaseName': 'ivz-dev-ds-data-packs', 'Classifiers': [], 'SchemaChangePolicy': {'UpdateBehavior': 'UPDATE_IN_DATABASE', 'DeleteBehavior': 'DEPRECATE_IN_DATABASE'}, 'State': 'READY', 'CrawlElapsedTime': 0, 'CreationTime': datetime.datetime(2020, 4, 14, 2, 31, 25, tzinfo=tzlocal()), 'LastUpdated': datetime.datetime(2020, 5, 28, 21, 52, 4, tzinfo=tzlocal()), 'LastCrawl': {'Status': 'SUCCEEDED', 'LogGroup': '/aws-glue/crawlers', 'LogStream': 'ivz-dev-ds-crwlr-data-packs-ubs', 'MessagePrefix': '6c00dc7b-181e-4eb2-8d6d-d195f97b03ce', 'StartTime': datetime.datetime(2020, 6, 4, 16, 13, 18, tzinfo=tzlocal())}, 'Version': 5, 'Configuration': '{"Version":1.0,"Grouping":{"TableGroupingPolicy":"CombineCompatibleSchemas"}}'}], 'NextToken': 'discovery_rep', 'ResponseMetadata': {'RequestId': '43e0b162-***********', 'HTTPStatusCode': 200, 'HTTPHeaders': {'date': 'Fri, 02 Apr 2021 11:00:18 GMT', 'content-type': 'application/x-amz-json-1.1', 'content-length': '89110', 'connection': 'keep-alive', 'x-amzn-requestid': '43e0b162-********'}, 'RetryAttempts': 0}}

Crawler ใน AWS Glue ใช้สำหรับสแกนข้อมูลในแหล่งต่างๆ (S3, JDBC, DynamoDB, Catalog) และสร้าง/อัปเดต table metadata ใน Data Catalog โดยอัตโนมัติ ผลลัพธ์แสดงรายละเอียดครบถ้วน: targets, database, classifiers, schema change policy, state, crawl history, version, configuration เป็นต้น