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Showing content from http://cloud.google.com/cpp/docs/reference/storage/2.30.0/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 document provides examples and information regarding storage retry mechanisms for various versions, with version 2.37.0-rc being the latest, and also lists all versions back to 2.11.0, including version 2.30.0."],["The library automatically retries requests that fail with transient errors using exponential backoff, and the default policy retries for up to 15 minutes."],["Developers can override the default retry policies, such as `RetryPolicy` and `Backoff`, to customize the number of retries or the duration of the backoff period, allowing for specific retry behaviors like retrying only three times."],["The library's default behavior is to retry all operations, but developers can set an `IdempotencyPolicy` to only retry operations that are idempotent, providing a more conservative approach."],["Alternative policies such as `LimitedTimeRetryPolicy`, `LimitedErrorCountRetryPolicy`, `ExponentialBackoffPolicy`, `AlwaysRetryIdempotencyPolicy`, and `StrictIdempotencyPolicy` are available for different retry and idempotency strategies."]]],[]]

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