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18.4.1 Scheduled transfer
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In our sample in listing 18.1, a scheduled transfer of the performance counter data is set r to occur every minute. As we covered earlier, transferring every minute is quite aggressive, and is probably reasonable only in a testing or debugging environment. In our next example, we re going to show you how to transfer the IIS logs to storage on a daily basis. The IIS logs are automatically captured by default by the diagnostic agent, so you don t need to add them as a data source. You can set the transfer interval to once a day with this line:
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instanceConfiguration.Logs.ScheduledTransferPeriod = TimeSpan.FromDays(1.0);
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Any log files that are captured are sent to a container in BLOB storage, not to a table. Each transfer results in one file in the container. A container hierarchy similar to what you would see on the real server is created for you by the diagnostic agent. Your IIS logs will be in a folder structure similar to what you re used to. If logs that you don t want to transfer are collected, you can set ScheduledTransferPeriod to 0. This setting disables the transfer of any data for that data source. We
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Running a healthy service in the cloud
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typically do this for the Azure diagnostics log themselves, at least until there s a problem with the diagnostic agent itself that requires troubleshooting. That s how you schedule a transfer. Now let s discuss how you can trigger a transfer on demand.
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18.4.2 On-demand transfer
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An on-demand transfer lets you configure a onetime transfer of the diagnostics data. This kind of transfer gives you the ability to pick and choose what is transferred and when. A typical scenario is you want an immediate dump of logs because you see that something critical is happening. You can set up an on-demand transfer in much the same way as you would a normal transfer, although there are some differences. In the following listing, we re initiating an on-demand transfer from within one of the instances, but you can also initiate the transfer from outside the role with an administrative application.
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Listing 18.3 Initiating an on-demand transfer
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DeploymentDiagnosticManager myDDM = new DeploymentDiagnosticManager(RoleEnvironment .GetConfigurationSettingValue("DiagnosticsConnectionString"), txtDeploymentID.Text); var myRoleInstanceDiagnosticManager = myDDM.GetRoleInstanceDiagnosticManagersForRole("NinjaWebSite");
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Transfers performance DataBufferName datasourceToTransfer = counters DataBufferName.PerformanceCounters; OnDemandTransferOptions transferOptions = new OnDemandTransferOptions(); Selects time transferOptions.From = DateTime.UtcNow filter for data TimeSpan.FromHours(1.0); to be sent transferOptions.To = DateTime.UtcNow; transferOptions.NotificationQueueName = "transfernotificationqueue";
foreach (var instanceAgent in myRoleInstanceDiagnosticManager) Provides { queue name for Guid requestID = instanceAgent notification messages .BeginOnDemandTransfer (datasourceToTransfer, transferOptions); Starts transfer for System.Diagnostics.Trace.WriteLine("on demand started:" + each instance requestID.ToString(), "Information"); in role }
Like in the remote configuration example, you need to get a reference to the RoleInstanceDiagnosticManagersForRole class. This reference will let you work with the configuration manager for each instance. In this example, you re going to be transferring the performance counter data over to an Azure table q. This transfer will include all counters you might have running from prior configuration changes. You use the OnDemandTransferOptions class to configure how the transfer should happen. This class has several parameters that you ll want to set. Set a time filter at w,
Using the service management API
Figure 18.7 You can configure an on-demand transfer to notify you when a transfer is complete by placing a message in a queue you specify. In this example, the role had two instances, so two transfers were completed, one for each instance.
which tells the agent to send over only the performance counter data that s been generated in the last hour. If you re transferring a log, you can also specify a log level filter (informational, critical, and so on). When you start the transfers, each instance performs its own transfer. The transfer operation is an asynchronous operation; you start it and walk away. In most cases, you ll want to know when the transfers have completed so that you can start analyzing the data. You can have the transfer agent notify you when the transfer for an instance is complete by passing in a queue name e. As each transfer is started, you ll be given a unique ID r to track. You can see the completion messages in figure 18.7. Each message contains one of the unique IDs associated with each transfer. When each transfer is complete, the agent drops a small message onto the queue you designated with that same ID. The message lets you track which transfers have been completed. A great place to use an on-demand transfer is in the OnStop method in your RoleEntryPoint override class. Whenever a role is being shut down, either intentionally or otherwise, this method fires. If you do an on-demand transfer in this method, you ll save your log files from being erased during a reboot or a move. These log files can help you troubleshoot instance failures. Because you might not have enough time to transfer gigabytes of log files, make sure that you re transferring only the critical information you need when you do this. Now that you know how to get data about what s happening with your service, we need to tell you about the APIs that ll help you do something about what you see happening.
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