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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 webpage provides documentation for different versions of the \u003ccode\u003eMessageOrderingOption\u003c/code\u003e in 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\u003eMessage ordering ensures that messages are received in the same order they are sent by a publisher, requiring the client library to wait for batch delivery before sending the next batch.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eMessageOrderingOption\u003c/code\u003e feature is disabled by default, as it can limit throughput for applications that do not require message ordering.\u003c/p\u003e\n"],["\u003cp\u003eDetailed information about message ordering can be found in the \u003ccode\u003ePublisher\u003c/code\u003e class documentation.\u003c/p\u003e\n"],["\u003cp\u003eThe type alias of the \u003ccode\u003eMessageOrderingOption\u003c/code\u003e is a \u003ccode\u003ebool\u003c/code\u003e data type.\u003c/p\u003e\n"]]],[],null,[]]
