Wenzhi Feng
Tip: If you want to cherry pick this pr, please cherry pick this patch too: https://github.com/apache/pulsar/pull/23156
PTAL, thanks. @congbobo184 @liangyepianzhou
PTAL, thanks. @Demogorgon314 @lhotari @heesung-sn I am not good at plotting graph, may be we need the author to fix this.
PTAL, thanks. @shoothzj @eolivelli @dlg99 @horizonzy
For example, the cpu.idle will decrease significantly while doing compaction. 
> I am rather indifferent about the change. There was an attempt in the to implement something similar: #851 > > It was abandoned, as I remember, because the company...
There is one point need to be discussed: we should check it at the beginning of the compaction, but should we check it each time before we try to compact...
First of all, what do you mean by cancelling a delayed message? do you want to delete such message in broker and don't dispatch it, or cancel the delayed time...
This is a big new feature, impacting the core logic, a pip may be needed to get more opinions from the community.