Impostazione di un timeout personalizzato e nuovi tentativi

Imposta un timeout personalizzato e riprova per le impostazioni della richiesta.

Per saperne di più

Per la documentazione dettagliata che include questo esempio di codice, consulta quanto segue:

Esempio di codice

C++

Per scoprire come installare e utilizzare la libreria client per Spanner, consulta Librerie client Spanner.

Per eseguire l'autenticazione su Spanner, configura Credenziali predefinite dell'applicazione. Per maggiori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 

namespace spanner = ::google::cloud::spanner;
using ::google::cloud::StatusOr;
[](std::string const& project_id, std::string const& instance_id,
   std::string const& database_id) {
  // Use a truncated exponential backoff with jitter to wait between
  // retries:
  //   https://en.wikipedia.org/wiki/Exponential_backoff
  //   https://cloud.google.com/storage/docs/exponential-backoff
  auto client = spanner::Client(spanner::MakeConnection(
      spanner::Database(project_id, instance_id, database_id),
      google::cloud::Options{}
          .set<spanner::SpannerRetryPolicyOption>(
              std::make_shared<spanner::LimitedTimeRetryPolicy>(
                  /*maximum_duration=*/std::chrono::seconds(60)))
          .set<spanner::SpannerBackoffPolicyOption>(
              std::make_shared<spanner::ExponentialBackoffPolicy>(
                  /*initial_delay=*/std::chrono::milliseconds(500),
                  /*maximum_delay=*/std::chrono::seconds(16),
                  /*scaling=*/1.5))));

  std::int64_t rows_inserted;
  auto commit_result = client.Commit(
      [&client, &rows_inserted](
          spanner::Transaction txn) -> StatusOr<spanner::Mutations> {
        auto insert = client.ExecuteDml(
            std::move(txn),
            spanner::SqlStatement(
                "INSERT INTO Singers (SingerId, FirstName, LastName)"
                "  VALUES (20, 'George', 'Washington')"));
        if (!insert) return std::move(insert).status();
        rows_inserted = insert->RowsModified();
        return spanner::Mutations{};
      });
  if (!commit_result) throw std::move(commit_result).status();
  std::cout << "Rows inserted: " << rows_inserted;
}

C#

Per scoprire come installare e utilizzare la libreria client per Spanner, consulta Librerie client Spanner.

Per autenticarti a Spanner, configura le credenziali predefinite dell'applicazione. Per maggiori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 


using Google.Api.Gax;
using Google.Api.Gax.Grpc;
using Google.Cloud.Spanner.Common.V1;
using Google.Cloud.Spanner.V1;
using Grpc.Core;
using System;
using System.Threading;
using System.Threading.Tasks;
using static Google.Cloud.Spanner.V1.TransactionOptions.Types;

public class CustomTimeoutsAndRetriesAsyncSample
{
    public async Task<long> CustomTimeoutsAndRetriesAsync(string projectId, string instanceId, string databaseId)
    {
        // Create a SessionPool.
        SpannerClient client = SpannerClient.Create();
        SessionPool sessionPool = new SessionPool(client, new SessionPoolOptions());

        // Acquire a session with a read-write transaction to run a query.
        DatabaseName databaseName =
            DatabaseName.FromProjectInstanceDatabase(projectId, instanceId, databaseId);
        TransactionOptions transactionOptions = new TransactionOptions
        {
            ReadWrite = new ReadWrite()
        };
        using PooledSession session = await sessionPool.AcquireSessionAsync(
            databaseName, transactionOptions, CancellationToken.None);

        ExecuteSqlRequest request = new ExecuteSqlRequest
        {
            Sql = "INSERT Singers (SingerId, FirstName, LastName) VALUES (20, 'George', 'Washington')"
        };

        // Prepare the call settings with custom timeout and retry settings.
        CallSettings settings = CallSettings
            .FromExpiration(Expiration.FromTimeout(TimeSpan.FromSeconds(60)))
            .WithRetry(RetrySettings.FromExponentialBackoff(
                maxAttempts: 12,
                initialBackoff: TimeSpan.FromMilliseconds(500),
                maxBackoff: TimeSpan.FromSeconds(16),
                backoffMultiplier: 1.5,
                retryFilter: RetrySettings.FilterForStatusCodes(
                    new StatusCode[] { StatusCode.Unavailable })));

        ResultSet result = await session.ExecuteSqlAsync(request, settings);
        await session.CommitAsync(new CommitRequest(), null);

        return result.Stats.RowCountExact;
    }
}

Go

Per scoprire come installare e utilizzare la libreria client per Spanner, consulta Librerie client Spanner.

Per eseguire l'autenticazione su Spanner, configura Credenziali predefinite dell'applicazione. Per ulteriori informazioni, vedi Configura l'autenticazione per un ambiente di sviluppo locale. 


import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/spanner"
	spapi "cloud.google.com/go/spanner/apiv1"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/grpc/codes"
)

func setCustomTimeoutAndRetry(w io.Writer, db string) error {
	// Set a custom retry setting.
	co := &spapi.CallOptions{
		ExecuteSql: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    500 * time.Millisecond,
					Max:        16000 * time.Millisecond,
					Multiplier: 1.5,
				})
			}),
		},
	}
	client, err := spanner.NewClientWithConfig(context.Background(), db, spanner.ClientConfig{CallOptions: co})
	if err != nil {
		return err
	}
	defer client.Close()

	// Set timeout to 60s.
	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
	defer cancel()

	_, err = client.ReadWriteTransaction(ctx, func(ctx context.Context, txn *spanner.ReadWriteTransaction) error {
		stmt := spanner.Statement{
			SQL: `INSERT Singers (SingerId, FirstName, LastName)
					VALUES (20, 'George', 'Washington')`,
		}

		rowCount, err := txn.Update(ctx, stmt)
		if err != nil {
			return err
		}
		fmt.Fprintf(w, "%d record(s) inserted.\n", rowCount)
		return nil
	})
	return err
}

Java

Per scoprire come installare e utilizzare la libreria client per Spanner, consulta Librerie client Spanner.

Per eseguire l'autenticazione su Spanner, configura Credenziali predefinite dell'applicazione. Per maggiori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 


import com.google.api.gax.retrying.RetrySettings;
import com.google.api.gax.rpc.StatusCode.Code;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.Statement;
import org.threeten.bp.Duration;

class CustomTimeoutAndRetrySettingsExample {

  static void executeSqlWithCustomTimeoutAndRetrySettings() {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "my-project";
    String instanceId = "my-instance";
    String databaseId = "my-database";

    executeSqlWithCustomTimeoutAndRetrySettings(projectId, instanceId, databaseId);
  }

  // Create a Spanner client with custom ExecuteSql timeout and retry settings.
  static void executeSqlWithCustomTimeoutAndRetrySettings(
      String projectId, String instanceId, String databaseId) {
    SpannerOptions.Builder builder = SpannerOptions.newBuilder().setProjectId(projectId);
    // Set custom timeout and retry settings for the ExecuteSql RPC.
    // This must be done in a separate chain as the setRetryableCodes and setRetrySettings methods
    // return a UnaryCallSettings.Builder instead of a SpannerOptions.Builder.
    builder
        .getSpannerStubSettingsBuilder()
        .executeSqlSettings()
        // Configure which errors should be retried.
        .setRetryableCodes(Code.UNAVAILABLE)
        .setRetrySettings(
            RetrySettings.newBuilder()
                // Configure retry delay settings.
                // The initial amount of time to wait before retrying the request.
                .setInitialRetryDelay(Duration.ofMillis(500))
                // The maximum amount of time to wait before retrying. I.e. after this value is
                // reached, the wait time will not increase further by the multiplier.
                .setMaxRetryDelay(Duration.ofSeconds(16))
                // The previous wait time is multiplied by this multiplier to come up with the next
                // wait time, until the max is reached.
                .setRetryDelayMultiplier(1.5)

                // Configure RPC and total timeout settings.
                // Timeout for the first RPC call. Subsequent retries will be based off this value.
                .setInitialRpcTimeout(Duration.ofSeconds(60))
                // The max for the per RPC timeout.
                .setMaxRpcTimeout(Duration.ofSeconds(60))
                // Controls the change of timeout for each retry.
                .setRpcTimeoutMultiplier(1.0)
                // The timeout for all calls (first call + all retries).
                .setTotalTimeout(Duration.ofSeconds(60))
                .build());
    // Create a Spanner client using the custom retry and timeout settings.
    try (Spanner spanner = builder.build().getService()) {
      DatabaseClient client =
          spanner.getDatabaseClient(DatabaseId.of(projectId, instanceId, databaseId));
      client
          .readWriteTransaction()
          .run(transaction -> {
            String sql =
                "INSERT INTO Singers (SingerId, FirstName, LastName)\n"
                    + "VALUES (20, 'George', 'Washington')";
            long rowCount = transaction.executeUpdate(Statement.of(sql));
            System.out.printf("%d record inserted.%n", rowCount);
            return null;
          });
    }
  }
}

Node.js

Per scoprire come installare e utilizzare la libreria client per Spanner, consulta Librerie client di Spanner.

Per autenticarti a Spanner, configura le credenziali predefinite dell'applicazione. Per ulteriori informazioni, vedi Configura l'autenticazione per un ambiente di sviluppo locale. 

// Imports the Google Cloud client library
const {Spanner} = require('@google-cloud/spanner');

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'my-project-id';
// const instanceId = 'my-instance';
// const databaseId = 'my-database';

// Creates a client
const spanner = new Spanner({
  projectId: projectId,
});
const UNAVAILABLE_STATUS_CODE = 14;
const retryAndTimeoutSettings = {
  retry: {
    // The set of error codes that will be retried.
    retryCodes: [UNAVAILABLE_STATUS_CODE],
    backoffSettings: {
      // Configure retry delay settings.
      // The initial amount of time to wait before retrying the request.
      initialRetryDelayMillis: 500,
      // The maximum amount of time to wait before retrying. I.e. after this
      // value is reached, the wait time will not increase further by the
      // multiplier.
      maxRetryDelayMillis: 16000,
      // The previous wait time is multiplied by this multiplier to come up
      // with the next wait time, until the max is reached.
      retryDelayMultiplier: 1.5,

      // Configure RPC and total timeout settings.
      // Timeout for the first RPC call. Subsequent retries will be based off
      // this value.
      initialRpcTimeoutMillis: 60000,
      // Controls the change of timeout for each retry.
      rpcTimeoutMultiplier: 1.0,
      // The max for the per RPC timeout.
      maxRpcTimeoutMillis: 60000,
      // The timeout for all calls (first call + all retries).
      totalTimeoutMillis: 60000,
    },
  },
};

// Gets a reference to a Cloud Spanner instance and database
const instance = spanner.instance(instanceId);
const database = instance.database(databaseId);
const table = database.table('Singers');

const row = {
  SingerId: 16,
  FirstName: 'Martha',
  LastName: 'Waller',
};

await table.insert(row, retryAndTimeoutSettings);

console.log('record inserted.');

Python

Per scoprire come installare e utilizzare la libreria client per Spanner, consulta Librerie client di Spanner.

Per autenticarti a Spanner, configura le credenziali predefinite dell'applicazione. Per maggiori informazioni, consulta Configurare l'autenticazione per un ambiente di sviluppo locale. 

from google.api_core import exceptions as core_exceptions
from google.api_core import retry

# instance_id = "your-spanner-instance"
# database_id = "your-spanner-db-id"
spanner_client = spanner.Client()
instance = spanner_client.instance(instance_id)
database = instance.database(database_id)

retry = retry.Retry(
    # Customize retry with an initial wait time of 500 milliseconds.
    initial=0.5,
    # Customize retry with a maximum wait time of 16 seconds.
    maximum=16,
    # Customize retry with a wait time multiplier per iteration of 1.5.
    multiplier=1.5,
    # Customize retry with a timeout on
    # how long a certain RPC may be retried in
    # case the server returns an error.
    timeout=60,
    # Configure which errors should be retried.
    predicate=retry.if_exception_type(
        core_exceptions.ServiceUnavailable,
    ),
)

# Set a custom retry and timeout setting.
with database.snapshot() as snapshot:
    results = snapshot.execute_sql(
        "SELECT SingerId, AlbumId, AlbumTitle FROM Albums",
        # Set custom retry setting for this request
        retry=retry,
        # Set custom timeout of 60 seconds for this request
        timeout=60,
    )

    for row in results:
        print("SingerId: {}, AlbumId: {}, AlbumTitle: {}".format(*row))

Ruby

Per scoprire come installare e utilizzare la libreria client per Spanner, consulta Librerie client Spanner.

Per autenticarti a Spanner, configura le credenziali predefinite dell'applicazione. Per ulteriori informazioni, vedi Configura l'autenticazione per un ambiente di sviluppo locale. 

# project_id  = "Your Google Cloud project ID"
# instance_id = "Your Spanner instance ID"
# database_id = "Your Spanner database ID"

require "google/cloud/spanner"

spanner   = Google::Cloud::Spanner.new project: project_id
client    = spanner.client instance_id, database_id
row_count = 0

timeout = 60.0
retry_policy = {
  initial_delay: 0.5,
  max_delay:     16.0,
  multiplier:    1.5,
  retry_codes:   ["UNAVAILABLE"]
}
call_options = { timeout: timeout, retry_policy: retry_policy }

client.transaction do |transaction|
  row_count = transaction.execute_update(
    "INSERT INTO Singers (SingerId, FirstName, LastName) VALUES (10, 'Virginia', 'Watson')",
    call_options: call_options
  )
end

puts "#{row_count} record inserted."

Passaggi successivi

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