Re: Why RocksDB metrics cache-usage is larger than cache-capacity

[Hangxiang Yu]

Hi, Lei.
It's indeed a bit confusing. Could you share the related rocksdb log which
may contain more detailed info ?

On Fri, Apr 12, 2024 at 12:49 PM Lei Wang <leiwang...@gmail.com> wrote:

>
> I enable RocksDB native metrics and do some performance tuning.
>
> state.backend.rocksdb.block.cache-size is set to 128m，4 slots for each
> TaskManager.
>
> The observed result for one specific parallel slot:
> state.backend.rocksdb.metrics.block-cache-capacity  is about 14.5M
>   state.backend.rocksdb.metrics.block-cache-usage      is about  24M
>
> I am a little confused, why usage is larger than capacity?
>
> Thanks,
> Lei
>


-- 
Best,
Hangxiang.