Consider revert DashMap

[zhang2014]

Summary
DashMap will introduce gc threads. If it's not necessary, maybe we should consider revert it.

[PsiACE]

DashMap will introduce gc threads. If it's not necessary, maybe we should consider revert it.

https://github.com/moka-rs/moka

It looks like a moka problem, may need set thread_pool_enabled to false using the cache builder.

moka-rs/moka#154 (comment)

cc @Xuanwo

[Xuanwo]

We can fix this on the opendal side. @PsiACE Do you want to do this?

[PsiACE]

We can fix this on the opendal side. @PsiACE Do you want to do this?

OK, I'll check it out and it looks like I can add a new parameter to the Builder

[Xuanwo]

OK, I'll check it out and it looks like I can add a new parameter to the Builder

We can just disable it directly and add it back if users need this.

[PsiACE]

We can just disable it directly and add it back if users need this.

oops, it looks like we're using moka::future::Cache, this option doesn't work, I'll check again. 😢 :

[Xuanwo]

Maybe we can replace future::Cache with sync::SegmentedCache or dash::Cach

[Xuanwo]

Already addressed.