Microsoft.Azure.Cosmos.Table LocationMode.SecondaryOnly RA-GRS Exception 此操作只能針對主存儲位置執行

Question

在解析使用 SAS 令牌的連接字符串時，我很難讓 Microsoft.Azure.Cosmos.Table 自動初始化 SecondaryUri。

所以我最終在連接字符串中明確指定了 TableSecondaryEndpoint，這有效，但我無法查詢輔助，因為 SDK 在嘗試請求之前拋出異常。

在我的測試中，我發現這是 Microsoft.WindowsAzure.Storage.Table 8.7.0（Microsoft.Azure.Cosmos.Table 1.0.6 的基礎）中不存在的回歸

非常歡迎專家意見指出這一點。 謝謝你。

這里異常的項目代碼（也在下面復制）： https : //github.com/golfalot/SOshowAzureTableBug

詳細說明此處提出的 SecondaryUri 初始化問題的附帶問題： https : //github.com/Azure/azure-cosmos-table-dotnet/issues/36

using System;
using System.Collections.Generic;

using LEGACY_STORAGE = Microsoft.WindowsAzure.Storage;
using LEGACY_RETRY = Microsoft.WindowsAzure.Storage.RetryPolicies;
using LEGACY_TABLE = Microsoft.WindowsAzure.Storage.Table; //8.7.0 because this is the base for 1.0.6

using NEWEST_TABLE = Microsoft.Azure.Cosmos.Table; // version 1.0.6
using Microsoft.Azure.Cosmos.Table; // had to add this to get access CreateCloudTableClient extension method

using System.Diagnostics;

namespace SOshowAzureTableBug
{
    class Program
    {
        // the SAS token is immaterial in reproducing the problem
        const string connectionTableSAS = "TableSecondaryEndpoint=http://127.0.0.1:10002/devstoreaccount1-secondary;TableEndpoint=http://127.0.0.1:10002/devstoreaccount1;SharedAccessSignature=immaterial";
        static void Main(string[] args)
        {

            /* Legacy Table SDK */
            var storageAccountLegacy = LEGACY_STORAGE.CloudStorageAccount.Parse(connectionTableSAS);
            var tableClientLegacy = storageAccountLegacy.CreateCloudTableClient();
            Debug.Assert(tableClientLegacy.StorageUri.SecondaryUri != null); // demonstrate SecondaryUri initialised

            var tableRequestOptionsLegacy = new LEGACY_TABLE.TableRequestOptions () { LocationMode = LEGACY_RETRY.LocationMode.SecondaryOnly };
            tableClientLegacy.DefaultRequestOptions = tableRequestOptionsLegacy;

            var tableLegacy = tableClientLegacy.GetTableReference("foo"); // don't need table to exist to show the issue
            var retrieveOperation = LEGACY_TABLE.TableOperation.Retrieve(string.Empty, string.Empty, new List<string>() { "bar" });

            var tableResult = tableLegacy.Execute(retrieveOperation);
            Console.WriteLine("Legacy PASS");


            /* Newset Table SDK */
            var storageAccountNewest = NEWEST_TABLE.CloudStorageAccount.Parse(connectionTableSAS);
            var tableClientNewest = storageAccountNewest.CreateCloudTableClient(new TableClientConfiguration());
            Debug.Assert(tableClientNewest.StorageUri.SecondaryUri != null); // demonstrate SecondaryUri initialised

            var tableRequestOptionsNewest = new NEWEST_TABLE.TableRequestOptions() { LocationMode = NEWEST_TABLE.LocationMode.SecondaryOnly };
            tableClientNewest.DefaultRequestOptions = tableRequestOptionsNewest;

            var tableNewset = tableClientNewest.GetTableReference("foo"); // don't need table to exist to show the issue
            var retrieveOperationNewset = NEWEST_TABLE.TableOperation.Retrieve(string.Empty, string.Empty, new List<string>() { "bar" });

            /* throws Microsoft.Azure.Cosmos.Table.StorageException
             * Exception thrown while initializing request: This operation can only be executed against the primary storage location
             */
            var tableResultNewset = tableNewset.Execute(retrieveOperationNewset);

            Console.WriteLine("Press any key to exit");
            Console.Read();
        }
    }
}

Answer 1

我相信您遇到了 SDK 的錯誤。

當我嘗試以下代碼時，我收到與您相同的錯誤：

        var account = CloudStorageAccount.Parse(connectionString);

        var requestOptions = new TableRequestOptions()
        {
            LocationMode = LocationMode.SecondaryOnly
        };
        var client = account.CreateCloudTableClient();
        client.DefaultRequestOptions = requestOptions;
        var table = client.GetTableReference("myTable");
        var op = TableOperation.Retrieve("", "");
        var result1 = table.Execute(op);

我反編譯了庫代碼，找到了罪魁禍首源代碼：

if (commandLocationMode == CommandLocationMode.PrimaryOnly)
                {
                    if (restCMD.LocationMode == LocationMode.SecondaryOnly)
                    {
                        throw new InvalidOperationException("This operation can only be executed against the primary storage location.");//This is the error that gets thrown.
                    }
                    Logger.LogInformational(executionState.OperationContext, "This operation can only be executed against the primary storage location.", Array.Empty<object>());
                    executionState.CurrentLocation = StorageLocation.Primary;
                    restCMD.LocationMode = LocationMode.PrimaryOnly;
                }

但是，如果我不在客戶端級別設置DefaultRequestOptions並在下面的Execute方法中指定它，我不會收到錯誤，但這是因為主端點被擊中而不是次要端點（我在 Fiddler 中檢查過）。

        var account = CloudStorageAccount.Parse(connectionString);

        var requestOptions = new TableRequestOptions()
        {
            LocationMode = LocationMode.SecondaryOnly
        };
        var client = account.CreateCloudTableClient();
        var table = client.GetTableReference("myTable");
        var op = TableOperation.Retrieve("", "");
        var result1 = table.Execute(op, requestOptions);

解決方法

如果您的目標是從輔助位置查詢實體，那么您可以在CloudTable上使用ExecuteQuery方法，如下所示。 這有效（同樣，我檢查了 Fiddler）。

        var account = CloudStorageAccount.Parse(connectionString);

        var requestOptions = new TableRequestOptions()
        {
            LocationMode = LocationMode.SecondaryOnly
        };
        var client = account.CreateCloudTableClient();
        client.DefaultRequestOptions = requestOptions;
        var table = client.GetTableReference("myTable");
        TableQuery query = new TableQuery();
        var result = table.ExecuteQuery(query).ToList();