nhancdt2602 commented on PR #3557:
URL: https://github.com/apache/kvrocks/pull/3557#issuecomment-5014949992
> @nhancdt2602 It seems only the calls/latency are related to the namespace,
so I'm wondering if it's better to extend the existing functions in `stats`:
>
> ```c++
> void IncrCalls(const string &ns, const string &cmd) {
> stats->total_calls++;
> if (ns != kDefaultNamespace) {
> stats->ns_command_calls[ns]++;
> }
> }
> ```
>
> so that we don't need to intercepting the stats and namespace in serval
places. cc @jihuayu @PragmaTwice
Thanks @git-hulk for your review. I saw your point about moving the
namespace resolution logic into stats fields/methods like `IncrCall`,
`IncrLatency` or `commands_histogram`. The reason I resolve the namespace at
the caller layer rather than inside `IncrCalls/IncrLatency` is to keep the
command hot path lock-free.
I want to keep the overhead of adding namespace telemetry information as
minimal as possible. By keeping the namespace stats pointer when a connection
is established, we are free of lock when accessing the namespace stat entry.
That said, if you and project members prefer consolidating into Stats,
accepting a per-command lock. I'm happy to refactor that way; just let me know
the preferred trade-off.
I'd love to hear your opinion about this ^^
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