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Showing content from http://cloud.google.com/cpp/docs/reference/storage/2.27.0/storage-retry-examples below:

C++ Client Libraries | Google Cloud

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Override the default retry policies

The library automatically retries requests that fail with transient errors, and follows the recommended practice to backoff between retries. Application developers can override the default retry and backoff policies:

  namespace gcs = ::google::cloud::storage;
  using ::google::cloud::StatusOr;
  [](std::string const& bucket_name, std::string const& object_name,
     std::string const& contents) {
    // Create a client that only gives up on the third error. The default policy
    // is to retry for several minutes.
    auto client =
        gcs::Client(google::cloud::Options{}.set<gcs::RetryPolicyOption>(
            gcs::LimitedErrorCountRetryPolicy(3).clone()));

    StatusOr<gcs::ObjectMetadata> object_metadata =
        client.InsertObject(bucket_name, object_name, std::move(contents),
                            gcs::IfGenerationMatch(0));
    if (!object_metadata) throw std::move(object_metadata).status();

    std::cout << "The object " << object_metadata->name()
              << " was created in bucket " << object_metadata->bucket()
              << "\nFull metadata: " << *object_metadata << "\n";
  }

The default policies are to continue retrying for up to 15 minutes, and to use truncated (at 5 minutes) exponential backoff, doubling the maximum backoff period between retries.

By default the library retries all operations, even those that are not idempotent. Application developers can override the idempotency policy to follow a more conservative approach:

  namespace gcs = ::google::cloud::storage;
  using ::google::cloud::StatusOr;
  [](std::string const& bucket_name, std::string const& object_name,
     std::string const& contents) {
    // Create a client that only retries idempotent operations, the default is
    // to retry all operations.
    auto client =
        gcs::Client(google::cloud::Options{}.set<gcs::IdempotencyPolicyOption>(
            gcs::StrictIdempotencyPolicy().clone()));
    StatusOr<gcs::ObjectMetadata> object_metadata =
        client.InsertObject(bucket_name, object_name, std::move(contents),
                            gcs::IfGenerationMatch(0));
    if (!object_metadata) throw std::move(object_metadata).status();

    std::cout << "The object " << object_metadata->name()
              << " was created in bucket " << object_metadata->bucket()
              << "\nFull metadata: " << *object_metadata << "\n";
  }

See Also

AlwaysRetryIdempotencyPolicy and StrictIdempotencyPolicy for alternative idempotency policies.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This page provides documentation for various versions of the C++ storage library, with the latest release candidate being version 2.37.0-rc."],["The library automatically retries requests with transient errors using exponential backoff, as recommended by Google Cloud Storage practices."],["Developers can override the default retry and backoff policies to customize how the library handles transient errors."],["The library's default behavior is to retry all operations, but application developers have the option to specify that only idempotent operations should be retried by overriding the default idempotency policy."],["Alternative retry and idempotency policies, such as `LimitedTimeRetryPolicy`, `LimitedErrorCountRetryPolicy`, `AlwaysRetryIdempotencyPolicy`, and `StrictIdempotencyPolicy`, are available for further customization."]]],[]]

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