问如何使用代码切换“将相同设置应用于全局辅助索引”？
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Stack Overflow用户

提问于 2018-04-24 08:10:34

回答 1查看 944关注 0票数 1

我正在使用Boto3在DynamoDB中创建表。我已经使用以下代码启用了自动缩放：

def conf_auto_scaling(self, table_name):
    print("INFO :: Creating auto scaling for Table [%s]" % table_name)

    # Read capacity
    self.as_c.register_scalable_target(ServiceNamespace='dynamodb',
                                       ResourceId='table/%s' % table_name,
                                       ScalableDimension='dynamodb:table:ReadCapacityUnits',
                                       MinCapacity=5,
                                       MaxCapacity=4000)
    # Write capacity
    self.as_c.register_scalable_target(ServiceNamespace='dynamodb',
                                       ResourceId='table/%s' % table_name,
                                       ScalableDimension='dynamodb:table:WriteCapacityUnits',
                                       MinCapacity=5,
                                       MaxCapacity=1000)

    percent_of_use_to_aim_for = 70.0
    scale_out_cooldown_in_seconds = 60
    scale_in_cooldown_in_seconds = 60
    self.as_c.put_scaling_policy(ServiceNamespace='dynamodb',
                                 ResourceId='table/%s' % table_name,
                                 PolicyType='TargetTrackingScaling',
                                 PolicyName='ScaleDynamoDBReadCapacityUtilization',
                                 ScalableDimension='dynamodb:table:ReadCapacityUnits',
                                 TargetTrackingScalingPolicyConfiguration={
                                     'TargetValue': percent_of_use_to_aim_for,
                                     'PredefinedMetricSpecification': {
                                         'PredefinedMetricType': 'DynamoDBReadCapacityUtilization'
                                     },
                                     'ScaleOutCooldown': scale_out_cooldown_in_seconds,
                                     'ScaleInCooldown': scale_in_cooldown_in_seconds
                                 })
    self.as_c.put_scaling_policy(ServiceNamespace='dynamodb',
                                 ResourceId='table/%s' % table_name,
                                 PolicyType='TargetTrackingScaling',
                                 PolicyName='ScaleDynamoDBWriteCapacityUtilization',
                                 ScalableDimension='dynamodb:table:WriteCapacityUnits',
                                 TargetTrackingScalingPolicyConfiguration={
                                     'TargetValue': percent_of_use_to_aim_for,
                                     'PredefinedMetricSpecification': {
                                         'PredefinedMetricType': 'DynamoDBWriteCapacityUtilization'
                                     },
                                     'ScaleOutCooldown': scale_out_cooldown_in_seconds,
                                     'ScaleInCooldown': scale_in_cooldown_in_seconds
                                 })

如何启用“将相同设置应用于全局辅助索引”选项？

amazon-web-services

amazon-dynamodb

amazon-cloudformation

boto3

autoscaling

回答 1

Stack Overflow用户

发布于 2018-05-23 06:11:52

除了在“表”级别设置缩放策略所需的代码之外，您还拥有“索引”级别的代码。

因此，要将缩放策略设置为“索引”级别，您应该调用put_scaling_policy，，但对ResourceId和ScalableDimension使用不同的值。

例如：

auto_scaling_client.put_scaling_policy(
            ServiceNamespace='dynamodb',
            ResourceId=f'table/{PUT-HERE-YOUR-TABLE NAME}/index/{YOUR-INDEX-NAME}',
            PolicyType='TargetTrackingScaling',
            PolicyName='ScaleDynamoDBWriteCapacityUtilization',
            ScalableDimension='dynamodb:index:WriteCapacityUnits',
            TargetTrackingScalingPolicyConfiguration={
                'TargetValue': percent_of_use_to_aim_for,
                'PredefinedMetricSpecification': {
                    'PredefinedMetricType': 'DynamoDBWriteCapacityUtilization'
                },
                'ScaleOutCooldown': scale_out_cooldown_in_seconds,
                'ScaleInCooldown': scale_in_cooldown_in_seconds
            }