To guarantee messages are received by the service in the same order that the application gives them to a publisher, the client library needs to wait until a batch of messages is successfully delivered before sending the next batch, otherwise batches may arrive out of order as there is no guarantee the same channel or network path is used for each batch.
For applications that do not care about message ordering, this can limit the throughput. Therefore, the behavior is disabled by default.
See Also
the documentation for the Publisher class for details.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThe content provides documentation for various versions of the Google Cloud Pub/Sub C++ library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation details the \u003ccode\u003eMessageOrderingOption\u003c/code\u003e struct, which is available across all listed versions.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eMessageOrderingOption\u003c/code\u003e is used in the context of message ordering when utilizing the \u003ccode\u003ePublisher\u003c/code\u003e class.\u003c/p\u003e\n"],["\u003cp\u003eMessage ordering in Pub/Sub is disabled by default, as it can limit throughput, but it ensures messages are received in the same order they were sent.\u003c/p\u003e\n"],["\u003cp\u003eThe type alias of \u003ccode\u003eMessageOrderingOption\u003c/code\u003e is a boolean.\u003c/p\u003e\n"]]],[],null,[]]
