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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThis webpage 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 covers the \u003ccode\u003eMessageOrderingOption\u003c/code\u003e struct, accessible for each listed version, allowing users to review changes or features across specific releases.\u003c/p\u003e\n"],["\u003cp\u003eMessage ordering, a feature within the \u003ccode\u003ePublisher\u003c/code\u003e class, is discussed, which ensures messages are delivered in the same sequence they were sent.\u003c/p\u003e\n"],["\u003cp\u003eMessage ordering is disabled by default, because it can reduce throughput for applications that do not require it.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eMessageOrderingOption\u003c/code\u003e is an alias for the \u003ccode\u003ebool\u003c/code\u003e type.\u003c/p\u003e\n"]]],[],null,[]]
