After a publisher flushes a batch of messages the batch is (obviously) not received immediately by the service. While the batch remains pending it potentially consumes memory resources in the client (and/or the service).
Some applications may have constraints on the number of bytes and/or messages they can tolerate in this pending state, and may prefer to block or reject messages.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 page provides documentation for the \u003ccode\u003eMaxPendingBytesOption\u003c/code\u003e in the Google Cloud Pub/Sub C++ client library.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version of \u003ccode\u003eMaxPendingBytesOption\u003c/code\u003e is 2.37.0-rc, with numerous older versions also documented, including those ranging from 2.36.0 back to 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eMaxPendingBytesOption\u003c/code\u003e manages the maximum size for pending messages, which helps applications with memory constraints in handling messages that have been flushed but not yet received.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eMaxPendingBytesOption\u003c/code\u003e is an alias of \u003ccode\u003estd::size_t\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,[]]
