/// <summary>
/// Populates Azure Storage with the required files, and
/// submits the work item to the Azure Batch service.
/// </summary>
public async Task RunAsync()
{
Console.WriteLine("Running with the following settings: ");
Console.WriteLine("----------------------------------------");
Console.WriteLine(this.configurationSettings.ToString());
//Upload resources if required.
if (this.configurationSettings.ShouldUploadResources)
{
Console.WriteLine("Splitting file: {0} into {1} subfiles",
Constants.TextFilePath,
this.configurationSettings.NumberOfMapperTasks);
//Split the text file into the correct number of files for consumption by the mapper tasks.
FileSplitter splitter = new FileSplitter();
List <string> mapperTaskFiles = await splitter.SplitAsync(
Constants.TextFilePath,
this.configurationSettings.NumberOfMapperTasks);
await this.UploadResourcesAsync(mapperTaskFiles);
}
//Generate a SAS for the container.
string containerSasUrl = Helpers.ConstructContainerSas(
this.configurationSettings.StorageAccountName,
this.configurationSettings.StorageAccountKey,
this.configurationSettings.StorageServiceUrl,
this.configurationSettings.BlobContainer);
//Set up the Batch Service credentials used to authenticate with the Batch Service.
BatchCredentials batchCredentials = new BatchCredentials(
this.configurationSettings.BatchAccountName,
this.configurationSettings.BatchAccountKey);
using (IBatchClient batchClient = BatchClient.Connect(this.configurationSettings.BatchServiceUrl, batchCredentials))
{
using (IWorkItemManager workItemManager = batchClient.OpenWorkItemManager())
{
//Create the unbound work item in local memory. An object which exists only in local memory (and not on the Batch Service) is "unbound".
string workItemName = Environment.GetEnvironmentVariable("USERNAME") + DateTime.UtcNow.ToString("yyyyMMdd-HHmmss");
ICloudWorkItem unboundWorkItem = workItemManager.CreateWorkItem(workItemName);
//
// Construct the work item properties in local memory before commiting them to the Batch Service.
//
//Allow enough VMs in the pool to run each mapper task, and 1 extra to run the job manager.
int numberOfPoolVMs = 1 + this.configurationSettings.NumberOfMapperTasks;
//Define the pool specification for the pool which the work item will run on.
IPoolSpecification poolSpecification = new PoolSpecification()
{
TargetDedicated = numberOfPoolVMs,
VMSize = "small",
//You can learn more about os families and versions at:
//http://msdn.microsoft.com/en-us/library/azure/ee924680.aspx
OSFamily = "4",
TargetOSVersion = "*"
};
//Use the auto pool feature of the Batch Service to create a pool when the work item is created.
//This creates a new pool for each work item which is added.
IAutoPoolSpecification autoPoolSpecification = new AutoPoolSpecification()
{
AutoPoolNamePrefix = "TextSearchPool",
KeepAlive = false,
PoolLifeTimeOption = PoolLifeTimeOption.WorkItem,
PoolSpecification = poolSpecification
};
//Define the execution environment for this work item -- it will run on the pool defined by the auto pool specification above.
unboundWorkItem.JobExecutionEnvironment = new JobExecutionEnvironment()
{
AutoPoolSpecification = autoPoolSpecification
};
//Define the job manager for this work item. This job manager will run when any job is created and will submit the tasks for
//the work item. The job manager is the executable which manages the lifetime of the job
//and all tasks which should run for the job. In this case, the job manager submits the mapper and reducer tasks.
string jobManagerCommandLine = string.Format("{0} -JobManagerTask", Constants.TextSearchExe);
List <IResourceFile> jobManagerResourceFiles = Helpers.GetResourceFiles(containerSasUrl, Constants.RequiredExecutableFiles);
const string jobManagerTaskName = "JobManager";
unboundWorkItem.JobSpecification = new JobSpecification()
{
JobManager = new JobManager()
{
ResourceFiles = jobManagerResourceFiles,
CommandLine = jobManagerCommandLine,
//Determines if the job should terminate when the job manager process exits
KillJobOnCompletion = false,
Name = jobManagerTaskName
}
};
try
{
//Commit the unbound work item to the Batch Service.
Console.WriteLine("Adding work item: {0} to the Batch Service.", unboundWorkItem.Name);
await unboundWorkItem.CommitAsync(); //Issues a request to the Batch Service to add the work item which was defined above.
//
// Wait for the job manager task to complete.
//
//An object which is backed by a corresponding Batch Service object is "bound."
ICloudWorkItem boundWorkItem = await workItemManager.GetWorkItemAsync(workItemName);
//Wait for the job to be created automatically by the Batch Service.
string boundJobName = await Helpers.WaitForActiveJobAsync(boundWorkItem);
ICloudTask boundJobManagerTask = await workItemManager.GetTaskAsync(
workItemName,
boundJobName,
jobManagerTaskName);
TimeSpan maxJobCompletionTimeout = TimeSpan.FromMinutes(30);
IToolbox toolbox = batchClient.OpenToolbox();
ITaskStateMonitor monitor = toolbox.CreateTaskStateMonitor();
bool timedOut = await monitor.WaitAllAsync(new List <ICloudTask> {
boundJobManagerTask
}, TaskState.Completed, maxJobCompletionTimeout);
Console.WriteLine("Done waiting for job manager task.");
await boundJobManagerTask.RefreshAsync();
//Check to ensure the job manager task exited successfully.
await Helpers.CheckForTaskSuccessAsync(boundJobManagerTask, dumpStandardOutOnTaskSuccess : true);
if (timedOut)
{
throw new TimeoutException(string.Format("Timed out waiting for job manager task to complete."));
}
}
catch (AggregateException e)
{
e.Handle(
(innerE) =>
{
//We print all the inner exceptions for debugging purposes.
Console.WriteLine(innerE.ToString());
return(false);
});
throw;
}
catch (Exception e)
{
Console.WriteLine("Hit unexpected exception: {0}", e.ToString());
throw;
}
finally
{
//Delete the work item.
//This will delete the auto pool associated with the work item as long as the pool
//keep alive property is set to false.
if (this.configurationSettings.ShouldDeleteWorkItem)
{
Console.WriteLine("Deleting work item {0}", workItemName);
workItemManager.DeleteWorkItem(workItemName);
}
//Note that there were files uploaded to a container specified in the
//configuration file. This container will not be deleted or cleaned up by this sample.
}
}
}
}