Created
June 22, 2021 16:24
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DynamoDB table WCU/RCU reservation calculator
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import boto3 | |
from datetime import datetime | |
from dateutil.relativedelta import relativedelta | |
import numpy as np | |
def get_table_metrics(cloudwatch_client, table_name, start_time, end_time): | |
response = cloudwatch_client.get_metric_data( | |
MetricDataQueries=[ | |
{ | |
'Id': 'dynamoDBWCU', | |
'MetricStat': { | |
'Metric': { | |
'Namespace': 'AWS/DynamoDB', | |
'MetricName': 'ConsumedWriteCapacityUnits', | |
'Dimensions': [ | |
{'Name': 'TableName', 'Value': table_name} | |
] | |
}, | |
'Period': 3600, | |
'Stat': 'Sum' | |
} | |
}, | |
{ | |
'Id': 'dynamoDBRCU', | |
'MetricStat': { | |
'Metric': { | |
'Namespace': 'AWS/DynamoDB', | |
'MetricName': 'ConsumedReadCapacityUnits', | |
'Dimensions': [ | |
{'Name': 'TableName', 'Value': table_name} | |
] | |
}, | |
'Period': 3600, | |
'Stat': 'Sum' | |
} | |
} | |
], | |
StartTime=start_time, | |
EndTime=end_time | |
) | |
rcu_data = next(filter(lambda r: r['Id'] == 'dynamoDBRCU', response['MetricDataResults'])) | |
wcu_data = next(filter(lambda r: r['Id'] == 'dynamoDBWCU', response['MetricDataResults'])) | |
return (rcu_data['Values'], wcu_data['Values']) | |
# NOTE: you must have at least one month (preferably more) of data for this to be useful | |
# modify this for your needs | |
table_name = 'SOME_TABLE' | |
end_time = datetime.now() | |
start_time = end_time - relativedelta(years=1) | |
cloudwatch = boto3.client('cloudwatch') | |
rcu_data, wcu_data = get_table_metrics(cloudwatch, table_name, start_time, end_time) | |
print('WCU reservations') | |
print('With partial usage: {}, no partial usage: {}'.format(*np.percentile(wcu_data, [32, 46]))) | |
print('RCU reservations') | |
print('With partial usage: {}, no partial usage: {}'.format(*np.percentile(rcu_data, [32, 46]))) |
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