# Chapter 7 Production-side Delay Queue In this article, we will first introduce what a delay queue is and what it can be used for; how to properly use this feature and avoid pitfalls; then we will introduce the implementation principle of Pulsar's delay queue and its existing problems, and finally introduce how we solved this problem. All related code contributions have been merged into the community's main branch, and readers can choose an appropriate version to try these optimizations. {% embed url="" %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://tumbleds-library.gitbook.io/thetumbleds-library/chapter-7-production-side-delay-queue.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.