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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 webpage provides documentation for the \u003ccode\u003eMaxPendingBytesOption\u003c/code\u003e across multiple versions of a software library, from version 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eMaxPendingBytesOption\u003c/code\u003e relates to managing the maximum size of pending messages in a publisher's batch, which are messages that have been flushed but not yet received by the service.\u003c/p\u003e\n"],["\u003cp\u003eThis setting is useful for applications with constraints on the amount of memory consumed by pending messages, allowing them to block or reject messages when the limit is reached.\u003c/p\u003e\n"],["\u003cp\u003eThe underlying type for \u003ccode\u003eMaxPendingBytesOption\u003c/code\u003e is an alias of \u003ccode\u003estd::size_t\u003c/code\u003e, which is commonly used to represent the size of objects in memory.\u003c/p\u003e\n"]]],[],null,[]]
