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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThe content provides a list of different versions of a C++ library related to Google Cloud Pub/Sub, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eEach version listed corresponds to a specific documentation page for the \u003ccode\u003eMaxPendingMessagesOption\u003c/code\u003e structure within the library.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eMaxPendingMessagesOption\u003c/code\u003e manages the maximum number of messages that can be pending (not yet acknowledged) after a publisher has flushed a batch, which helps control memory consumption.\u003c/p\u003e\n"],["\u003cp\u003eThe type alias for the \u003ccode\u003eMaxPendingMessagesOption\u003c/code\u003e is \u003ccode\u003estd::size_t\u003c/code\u003e, indicating it represents a size or count.\u003c/p\u003e\n"],["\u003cp\u003eThe content shows how different versions manage pending messages in the client, which might block or reject them based on the number or size.\u003c/p\u003e\n"]]],[],null,[]]
