Unexpected response code from CloudTable.ExecuteBatch(..)

Question

When trying to do a batch insert to Azure Table Storage, I am getting a StorageException on CloudTable.ExecuteBatch():

TableBatchOperation batchOperation = new TableBatchOperation();

foreach (var entity in entities)
{
    batchOperation.InsertOrReplace(entity);
}

table.ExecuteBatch(batchOperation);

Exception thrown:

Microsoft.WindowsAzure.Storage.StorageException: Unexpected response code for operation : 6 at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteSync[T](StorageCommandBase1 cmd, IRetryPolicy policy, OperationContext operationContext) in e:\projects\azure-sdk-for-net\microsoft-azure-api\Services\Storage\Lib\DotNetCommon\Core\Executor\Executor.cs:line 737 at Microsoft.WindowsAzure.Storage.Table.TableBatchOperation.Execute(CloudTableClient client, String tableName, TableRequestOptions requestOptions, OperationContext operationContext) in e:\projects\azure-sdk-for-net\microsoft-azure-api\Services\Storage\Lib\DotNetCommon\Table\TableBatchOperation.cs:line 85 at Microsoft.WindowsAzure.Storage.Table.CloudTable.ExecuteBatch(TableBatchOperation batch, TableRequestOptions requestOptions, OperationContext operationContext) in e:\projects\azure-sdk-for-net\microsoft-azure-api\Services\Storage\Lib\DotNetCommon\Table\CloudTable.cs:line 165 at Library.Modules.Cloud.TableStorage.StorageTableRepository1.InsertOrReplaceBatch(List1 entities)

Inserting these entities normally using TableOperation gives me no problems.

I cannot find this exception anywhere on the internet or in the MSDN references.

Answer 1

It was due to duplicate RowKey values. Even with TableBatchOperation.InsertOrReplace(entities), the row keys still need to be unique.

Unexpected response code for operation : 6 was referring to the 6th element in the list. The error codes in the Azure SDK are very misleading in my opinion.