Hi jieshe, this issue happened again for us last night, we encountered this error 49 times, this is the exception trace:
{"log_thrown":"com.microsoft.azure.vmagent.exceptions.AzureCloudException: Failed to create Page Blob with script's length: 0\n\tat com.microsoft.azure.vmagent.exceptions.AzureCloudException.create(AzureCloudException.java:54)\n\tat com.microsoft.azure.vmagent.AzureVMManagementServiceDelegate.uploadCustomScript(AzureVMManagementServiceDelegate.java:671)\n\tat com.microsoft.azure.vmagent.AzureVMManagementServiceDelegate.createDeployment(AzureVMManagementServiceDelegate.java:370)\n\tat com.microsoft.azure.vmagent.AzureVMManagementServiceDelegate.createDeployment(AzureVMManagementServiceDelegate.java:170)\n\tat com.microsoft.azure.vmagent.AzureVMAgentTemplate.provisionAgents(AzureVMAgentTemplate.java:838)\n\tat com.microsoft.azure.vmagent.AzureVMCloud$3.call(AzureVMCloud.java:797)\n\tat com.microsoft.azure.vmagent.AzureVMCloud$3.call(AzureVMCloud.java:793)\n\tat java.util.concurrent.FutureTask.run(FutureTask.java:266)\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)\n\tat java.lang.Thread.run(Thread.java:745)\nCaused by: com.microsoft.azure.storage.StorageException: The server is busy.\n\tat com.microsoft.azure.storage.StorageException.translateFromHttpStatus(StorageException.java:175)\n\tat com.microsoft.azure.storage.StorageException.translateException(StorageException.java:94)\n\tat com.microsoft.azure.storage.core.StorageRequest.materializeException(StorageRequest.java:305)\n\tat com.microsoft.azure.storage.core.ExecutionEngine.executeWithRetry(ExecutionEngine.java:175)\n\tat com.microsoft.azure.storage.blob.CloudBlobContainer.exists(CloudBlobContainer.java:717)\n\tat com.microsoft.azure.storage.blob.CloudBlobContainer.createIfNotExists(CloudBlobContainer.java:328)\n\tat com.microsoft.azure.storage.blob.CloudBlobContainer.createIfNotExists(CloudBlobContainer.java:304)\n\tat com.microsoft.azure.vmagent.AzureVMManagementServiceDelegate.uploadCustomScript(AzureVMManagementServiceDelegate.java:662)\n\t... 9 more\n","thread_id":759090,"level":"SEVERE","log_source":"com.microsoft.azure.vmagent.AzureVMManagementServiceDelegate createDeployment","message":"AzureVMManagementServiceDelegate: deployment: Unable to deploy"}
thanks for reporting the issue. we're looking at it.