尝试读取性能计数器时Azure自动缩放异常
本文关键字:缩放 异常 Azure 读取 性能计数器 | 更新日期: 2023-09-27 18:10:12
我正在研究一个来自微软的例子,展示了如何使用自动缩放(http://www.windowsazure.com/en-us/develop/net/how-to-guides/autoscaling/)。安装在云上的工作者角色生成一个性能计数器,在本地,控制台应用程序读取该计数器并应用自动缩放。
一切看起来都很好,性能计数器可以从WADPerformanceCountersTable中获得,控制台应用程序可以正确访问存储,但它无法在WADPerformanceCountersTable中找到worker角色。这是生成的异常:
Autoscaling General Error: 2001 :
Microsoft.Practices.EnterpriseLibrary.WindowsAzure.Autoscaling.DataPointsCollection.DataPointsCollectionException:
Could not retrieve performance counter with name ''Processor(_Total)'% Processor Time'
for target 'WorkerRoleExample' from the WADPerformanceCountersTable table. --->
System.ArgumentOutOfRangeException: Could not retrieve the role with alias 'WorkerRoleExample' from the service information store.
Please review the service information store to fix this.
自动缩放应用程序块的配置文件(两个文件都是控制台应用程序的一部分):
rules.xml:
<?xml version="1.0" encoding="utf-8" ?>
<rules xmlns="http://schemas.microsoft.com/practices/2011/entlib/autoscaling/rules">
<constraintRules>
<rule name="default" enabled="true" rank="1" description="The default constraint rule">
<actions>
<range min="1" max="2" target="WorkerRoleExample"/>
</actions>
</rule>
</constraintRules>
<reactiveRules>
<rule name="ScaleUpOnHighUtilization" rank="10" description="Scale up the web role" enabled="true" >
<when>
<any>
<greaterOrEqual operand="WebRoleA_CPU_Avg_5m" than="60"/>
</any>
</when>
<actions>
<scale target="WorkerRoleExample" by="1"/>
</actions>
</rule>
<rule name="ScaleDownOnLowUtilization" rank="10" description="Scale up the web role" enabled="true" >
<when>
<all>
<less operand="WebRoleA_CPU_Avg_5m" than="60"/>
</all>
</when>
<actions>
<scale target="WorkerRoleExample" by="-1"/>
</actions>
</rule>
</reactiveRules>
<operands>
<performanceCounter alias="WebRoleA_CPU_Avg_5m"
performanceCounterName="'Processor(_Total)'% Processor Time"
source ="WorkerRoleExample"
timespan="00:05:00" aggregate="Average"/>
</operands>
</rules>
: services .
<?xml version="1.0" encoding="utf-8" ?>
<serviceModel xmlns="http://schemas.microsoft.com/practices/2011/entlib/autoscaling/serviceModel">
<subscriptions>
<subscription name="TestingWorkerRole"
certificateThumbprint="**************"
subscriptionId="**************"
certificateStoreLocation="CurrentUser"
certificateStoreName="My">
<services>
<service dnsPrefix="**************" slot="Staging">
<roles>
<role alias="AutoscalingApplicationRole"
roleName="WorkerRoleExample"
wadStorageAccountName="targetstorage"/>
</roles>
</service>
</services>
<storageAccounts>
<storageAccount alias="targetstorage"
connectionString="DefaultEndpointsProtocol=https;AccountName=*****;AccountKey=*******">
</storageAccount>
</storageAccounts>
</subscription>
</subscriptions>
</serviceModel>
运行在云上的Worker角色生成一个性能计数器:
public override bool OnStart()
{
// Set the maximum number of concurrent connections
ServicePointManager.DefaultConnectionLimit = 12;
CreatePerformanceCounters();
return base.OnStart();
}
private static void CreatePerformanceCounters()
{
DiagnosticMonitorConfiguration diagConfig = DiagnosticMonitor.GetDefaultInitialConfiguration();
var procTimeConfig = new PerformanceCounterConfiguration();
procTimeConfig.CounterSpecifier = @"'Processor(_Total)'% Processor Time";
procTimeConfig.SampleRate = TimeSpan.FromSeconds(10);
diagConfig.PerformanceCounters.DataSources.Add(procTimeConfig);
diagConfig.PerformanceCounters.ScheduledTransferPeriod = TimeSpan.FromMinutes(1);
DiagnosticMonitor.Start("Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString", diagConfig);
}
在services.xml中尝试修改:
<role alias="AutoscalingApplicationRole"
roleName="WorkerRoleExample"
wadStorageAccountName="targetstorage"/>
:
<role alias="WorkerRoleExample"
roleName="WorkerRoleExample"
wadStorageAccountName="targetstorage"/>
在rules.xml
中,scale
元素的target
属性在services.xml
中的role
元素上寻找匹配的alias
attribute
-它在寻找WorkerRoleExample
,但找不到它。
如果在rules.xml中更改:
<scale target="WorkerRoleExample" by="1"/>
:
<scale target="AutoscalingApplicationRole" by="1"/>