public static void JobError(string jobName, string message, ProgressRecorder progressRecorder, List <TransferDetail> failedFiles, List <TransferDetail> skippedFiles)
{
log.WriteLine("Error for Job: " + jobName);
log.WriteLine("Error: " + message);
log.WriteLine("WebJobs will make 5 attempts to rerun and complete");
log.WriteLine(progressRecorder.ToString());
if (failedFiles.Count > 0)
{
log.WriteLine("Detailed File Transfer Errors");
foreach (TransferDetail td in failedFiles)
{
log.WriteLine("Source File: " + td.Source);
log.WriteLine("Destination File: " + td.Destination);
log.WriteLine("Error Message: " + td.Error);
}
}
if (skippedFiles.Count > 0)
{
log.WriteLine("Skipped File Details");
foreach (TransferDetail td in skippedFiles)
{
log.WriteLine("Source File: " + td.Source);
log.WriteLine("Destination File: " + td.Destination);
log.WriteLine("Error Message: " + td.Error);
}
}
}
public static void JobComplete(string jobName, ProgressRecorder progressRecorder, List <TransferDetail> skippedFiles)
{
log.WriteLine("Job Complete: " + jobName);
log.WriteLine(progressRecorder.ToString());
if (skippedFiles.Count > 0)
{
log.WriteLine("Skipped File Details");
foreach (TransferDetail td in skippedFiles)
{
log.WriteLine("Source File: " + td.Source);
log.WriteLine("Destination File: " + td.Destination);
log.WriteLine("Error Message: " + td.Error);
}
}
}
public async static Task ProcessMessage([QueueTrigger("backupqueue")] CopyItem copyItem, TextWriter log, CancellationToken cancelToken)
{
// Copy TextWrite into Log Helper class
Logger.log = log;
// Log Job Start
await Logger.JobStartAsync(copyItem.JobName);
// This class accumulates transfer data during the copy
ProgressRecorder progressRecorder = new ProgressRecorder();
try
{
// OpContext to track PreCopy Retries on Azure Storage
// DML has its own context object and retry
_opContext = new OperationContext();
_opContext.Retrying += StorageRequest_Retrying;
// Define Blob Request Options
_blobRequestOptions = new BlobRequestOptions
{
// Defined Exponential Retry Policy above
RetryPolicy = _retryPolicy
};
// Set the number of parallel tasks in DML.
// This allows it to copy multiple items at once when copying a container or directory
// The best (and default value) is Environment.ProcessorCount * 8
int parallelTasks = Environment.ProcessorCount * 8;
TransferManager.Configurations.ParallelOperations = parallelTasks;
// Set the number of connections.
// This should match ParallelOperations so each DML copy task has its own connection to Azure Storage
ServicePointManager.DefaultConnectionLimit = parallelTasks;
// Short circuit additional request round trips. We are not chunking and
// uploading large amounts of data where we'd send 100's so set to false
ServicePointManager.Expect100Continue = false;
// User Agent for tracing
TransferManager.Configurations.UserAgentPrefix = "AzureDmlBackup";
// CancellationTokenSource used to cancel the transfer
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
// Open connections to both storage accounts
CloudStorageAccount sourceAccount = GetAccount(copyItem.SourceAccountToken);
CloudStorageAccount destinationAccount = GetAccount(copyItem.DestinationAccountToken);
// Represents a checkpoint from which a transfer may be resumed and continued.
// This is initalized as null first time then hydrated within CopyDirectoryAsync().
// However if this job is being resumed from a previous failure this function will hydrate
// from a serialized checkpoint saved to blob storage.
TransferCheckpoint transferCheckpoint = await GetTransferCheckpoint(copyItem.JobId);
// Context object for the transfer, provides additional runtime information about its execution
// If this is a resumed copy operation then pass the checkpoint to the TransferContext so it can resume the copy
TransferContext transferContext = new TransferContext(transferCheckpoint)
{
// Pipe transfer progress data to ProgressRecorder
// ProgressRecorder is used to log the results of the copy operation
ProgressHandler = progressRecorder,
// If the destination already exists this delegate is called.
// Return true to overwrite or false to skip the file during the transfer
OverwriteCallback = (source, destination) =>
{
return(OverwriteFile(source, destination, sourceAccount, destinationAccount, copyItem.IsIncremental));
}
};
// This event is used to log files skipped during the transfer
transferContext.FileSkipped += TransferContext_FileSkipped;
// This event is used to catch exceptions for files that fail during a transfer
transferContext.FileFailed += TransferContext_FileFailed;
// Set Options for copying the container such as search patterns, recursive, etc.
CopyDirectoryOptions copyDirectoryOptions = new CopyDirectoryOptions
{
IncludeSnapshots = true,
Recursive = true
};
// Get the root source and destination directories for the two containers to be copied
CloudBlobDirectory sourceDirectory = await GetDirectoryAsync(sourceAccount, copyItem.SourceContainer, copyItem.SourceDirectory);
CloudBlobDirectory destinationDirectory = await GetDirectoryAsync(destinationAccount, copyItem.DestinationContainer, copyItem.DestinationDirectory);
// Copy the container
await CopyDirectoryAsync(copyItem.JobId, sourceDirectory, destinationDirectory, copyDirectoryOptions, transferContext, transferCheckpoint, cancellationTokenSource);
// Check if any files failed during transfer
if (_failedFiles.Count > 0)
{
// Save a Checkpoint so we can restart the transfer
transferCheckpoint = transferContext.LastCheckpoint;
SaveTransferCheckpoint(copyItem.JobId, transferCheckpoint);
// Throw an exception to fail the job so WebJobs will rerun it
throw new Exception("One or more errors occurred during the transfer.");
}
// Log job completion
await Logger.JobCompleteAsync(copyItem.JobName, progressRecorder, _skippedFiles);
}
catch (Exception ex)
{
// Log Job Error
await Logger.JobErrorAsync(copyItem.JobName, ex.Message, progressRecorder, _failedFiles, _skippedFiles);
// Rethrow the error to fail the web job
throw ex;
}
}
// This function will get triggered/executed when a new message is written on the Azure WebJobs Queue called backupqueue
// This version uses CopyDirectoryAsync in DML 0.1. Blobs are copied in parallel using ForEachAsync()
public async static Task ProcessQueueMessage([QueueTrigger("backupqueue")] CopyItem copyItem, TextWriter log, CancellationToken cancelToken)
{
_log = log;
await log.WriteLineAsync("Job Start: " + copyItem.JobName);
// This class accumulates transfer data during the process
ProgressRecorder progressRecorder = new ProgressRecorder();
try
{
// OpContext for pre-copy retries on Azure Storage
// DML has its own context object and retry
OperationContext opContext = new OperationContext();
opContext.Retrying += StorageRequest_Retrying;
// Define Blob Request Options
BlobRequestOptions blobRequestOptions = new BlobRequestOptions
{
// Defined Exponential Retry Policy
RetryPolicy = _retryPolicy
};
// The default number of parallel tasks in DML = # of Processors * 8
// Set that as our max limit of parallel tasks to that amount since more gives us no additional performance
//int parallelTasks = Environment.ProcessorCount * 8;
int parallelTasks = Convert.ToInt32(ConfigurationManager.AppSettings["ParallelTasks"]);
// Set the number of http connections to # of Processors * 8
ServicePointManager.DefaultConnectionLimit = Environment.ProcessorCount * 8;
// Save additional request round trip. We are not chunking and
// uploading large amounts of data where we'd send 100's so set to false
ServicePointManager.Expect100Continue = false;
// CancellationTokenSource used to cancel the transfer
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
// Represents a checkpoint from which a transfer may be resumed and continue
// The checkpoint gets set on each call to CopyBlobAsync(). This allows the WebJob
// to fail then pick it right up and continue to copy blobs, completing the copy job
TransferCheckpoint transferCheckpoint = null;
// Open connections to both storage accounts
CloudStorageAccount sourceAccount = GetAccount(copyItem.SourceAccountToken);
CloudStorageAccount destinationAccount = GetAccount(copyItem.DestinationAccountToken);
// Context object for the transfer, provides additional runtime information about its execution
TransferContext transferContext = new TransferContext
{
// Pipe transfer progress data to ProgressRecorder
ProgressHandler = progressRecorder,
// Callback to overwrite destination if it exists
OverwriteCallback = (source, destination) =>
{
return(OverwriteFile(source, destination, sourceAccount, destinationAccount, copyItem, blobRequestOptions, opContext));
}
};
CloudBlobDirectory sourceContainer = await GetDirectoryAsync(sourceAccount, copyItem.SourceContainer, blobRequestOptions);
CloudBlobDirectory destinationContainer = await GetDirectoryAsync(destinationAccount, copyItem.DestinationContainer, blobRequestOptions);
BlobContinuationToken continueToken = null;
do
{
// Fetch blobs in groups of 5000 max. If more than that loop until continue token is not null
var listTask = await sourceContainer.ListBlobsSegmentedAsync(true, BlobListingDetails.None, null, continueToken, blobRequestOptions, opContext, cancelToken);
// Save the continuation token
continueToken = listTask.ContinuationToken;
// Asynchronous parallel iteratation through blobs to copy
await listTask.Results.ForEachAsync(parallelTasks, async task =>
{
CloudBlob sourceBlob = (CloudBlob)task;
CloudBlob destinationBlob = GetBlobReference(destinationContainer, sourceBlob);
// Copy the blob
await CopyBlobAsync(sourceBlob, destinationBlob, transferContext, transferCheckpoint, cancellationTokenSource);
// Check for cancellation
if (cancelToken.IsCancellationRequested)
{
await log.WriteLineAsync("Web Job Cancellation Requested");
cancellationTokenSource.Cancel();
}
});
}while (continueToken != null);
await log.WriteLineAsync(progressRecorder.ToString());
await log.WriteLineAsync("Job Complete: " + copyItem.JobName);
}
catch (Exception ex)
{
await log.WriteLineAsync("Backup Job error: " + copyItem.JobName + ", Error: " + ex.Message);
await log.WriteLineAsync(progressRecorder.ToString());
}
}
// This version uses CopyDirectoryAsync in DML 0.2. I'm not sure it is faster than what I did above copying them manually in DML 0.1
public async static Task ProcessQueueMessage2([QueueTrigger("backupqueue")] CopyItem copyItem, TextWriter log, CancellationToken cancelToken)
{
_log = log;
log.WriteLine("Job Start: " + copyItem.JobName);
// This class accumulates transfer data during the process
ProgressRecorder progressRecorder = new ProgressRecorder();
try
{
// OpContext to track PreCopy Retries on Azure Storage
// DML has its own context object and retry
OperationContext opContext = new OperationContext();
opContext.Retrying += StorageRequest_Retrying;
// Define Blob Request Options
BlobRequestOptions blobRequestOptions = new BlobRequestOptions
{
// Defined Exponential Retry Policy above
RetryPolicy = _retryPolicy
};
// Set the number of parallel tasks in DML. This allows it to copy multiple
// items at once when copying a container or directory
//int parallelTasks = Environment.ProcessorCount * 8;
int parallelTasks = Convert.ToInt32(ConfigurationManager.AppSettings["ParallelTasks"]);
// Set the number of connections so each DML copy task has its own connection to Azure Storage
ServicePointManager.DefaultConnectionLimit = Environment.ProcessorCount * 8;
TransferManager.Configurations.ParallelOperations = parallelTasks; //64;
log.WriteLine("Parallel Operations = " + parallelTasks.ToString());
// Short circuit additional request round trips. We are not chunking and
// uploading large amounts of data where we'd send 100's so set to false
ServicePointManager.Expect100Continue = false;
// CancellationTokenSource used to cancel the transfer
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
// Represents a checkpoint from which a transfer may be resumed and continued
// This is set within the CopyContainerAsync function
TransferCheckpoint transferCheckpoint = null;
// Open connections to both storage accounts
CloudStorageAccount sourceAccount = GetAccount(copyItem.SourceAccountToken);
CloudStorageAccount destinationAccount = GetAccount(copyItem.DestinationAccountToken);
// Context object for the transfer, provides additional runtime information about its execution
TransferContext transferContext = new TransferContext
{
// Pipe transfer progress data to ProgressRecorder
ProgressHandler = progressRecorder,
// Callback to overwrite destination if it exists
OverwriteCallback = (source, destination) =>
{
return(OverwriteFile(source, destination, sourceAccount, destinationAccount, copyItem, blobRequestOptions, opContext));
}
};
CopyDirectoryOptions copyDirectoryOptions = new CopyDirectoryOptions
{
IncludeSnapshots = true,
Recursive = true
};
// Get the root source and destination directories for the two containers to be copied
CloudBlobDirectory sourceDirectory = await GetDirectoryAsync(sourceAccount, copyItem.SourceContainer, blobRequestOptions);
CloudBlobDirectory destinationDirectory = await GetDirectoryAsync(destinationAccount, copyItem.DestinationContainer, blobRequestOptions);
// Copy the container
await CopyDirectoryAsync(sourceDirectory, destinationDirectory, copyDirectoryOptions, transferContext, transferCheckpoint, cancellationTokenSource);
log.WriteLine(progressRecorder.ToString());
log.WriteLine("Job Complete: " + copyItem.JobName);
}
catch (Exception ex)
{
log.WriteLine("Backup Job error: " + copyItem.JobName + ", Error: " + ex.Message);
log.WriteLine(progressRecorder.ToString());
}
}
