[英]How to get the list of instances for AWS EMR?
為什么 EC2 的列表與 EMR 列表不同?
EC2: https : //aws.amazon.com/ec2/spot/pricing/
EMR: https : //aws.amazon.com/emr/pricing/
為什么不是所有類型的 EC2 實例都可用於 EMR? 如何獲得這份特別名單?
這就是我使用的,雖然我不是 100% 確定它是准確的(因為我找不到文檔來支持我的一些選擇(-BoxUsage 等))。
值得查看來自 AWS 的響應,以找出定價客戶端響應中不同字段的不同值。
使用以下命令獲取響應列表:
default_profile = boto3.session.Session(profile_name='default')
# Only us-east-1 has the pricing API
# - https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/pricing.html
pricing_client = default_profile.client('pricing', region_name='us-east-1')
service_name = 'ElasticMapReduce'
product_filters = [
{'Type': 'TERM_MATCH', 'Field': 'location', 'Value': aws_region_name}
]
response = pricing_client.get_products(
ServiceCode=service_name,
Filters=product_filters,
MaxResults=100
)
response_list.append(response)
num_prices = 100
while 'NextToken' in response:
# re-query to get next page
獲得響應列表后,您可以過濾掉實際的實例信息:
emr_prices = {}
for response in response_list:
for price_info_str in response['PriceList']:
price_obj = json.loads(price_info_str)
attributes = price_obj['product']['attributes']
# Skip pricing info that doesn't specify a (EC2) instance type
if 'instanceType' not in attributes:
continue
inst_type = attributes['instanceType']
# AFAIK, Only usagetype attributes that contain the string '-BoxUsage' are the ones that contain the prices that we would use (empirical research)
# Other examples of values are <REGION-CODE>-M3BoxUsage, <REGION-CODE>-M5BoxUsage, <REGION-CODE>-M7BoxUsage (no clue what that means.. )
if '-BoxUsage' not in attributes['usagetype']:
continue
if 'OnDemand' not in price_obj['terms']:
continue
on_demand_info = price_obj['terms']['OnDemand']
price_dim = list(list(on_demand_info.values())[0]['priceDimensions'].values())[0]
emr_price = Decimal(price_dim['pricePerUnit']['USD'])
emr_prices[inst_type] = emr_price
實際上,從 boto3 文檔中弄清楚這一點很簡單。 特別是get_products文檔。
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