mwish

change `failure` to `thiserror`

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### What problem does this PR solve? `failure` crate is deprecated now, I changed it to `thiserror`. ### What is changed and how it works? ### Check List Tests -...

Rust: Create tests and code for scan

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[Scan](https://github.com/pingcap/talent-plan/blob/master/rust/projects/tools/project.md#extension-1-structopt) is important in our kv, in our training course, I intended to create code and test for scan from project1 to project4. Because user copy all files in tests...

Enhancement: Too much `Slice::ToString()` when encoding the key

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### Search before asking - [X] I had searched in the [issues](https://github.com/apache/incubator-kvrocks/issues) and found no similar issues. ### Motivation When encoding the user's key to kvrocks' internal key, there are...

Bthread: Lots of CPU cost on `do_futex` when running lightweight tasks

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**Describe the bug (描述bug)** Hi, we are using brpc and bthread as our rpc framework and runtime. Our tasks are lightweight, the workload is like handling a request and read...

Doc improvement: Fix register number in lab4 part5

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Fix issue https://github.com/rcore-os/rCore-Tutorial/issues/134

关于 Lab4 "内核栈" 寄存器数目的一些疑问

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需要保存的寄存器应该是： 1. `x1` 2. 原来的 sp，即 `x2` 3. x3-x32 的通用寄存器 4. `sstatus` 5. `sepc` 上述应该是 32 + 2 == 34 个寄存器 在 https://rcore-os.github.io/rCore-Tutorial-deploy/docs/lab-4/guide/part-5.html 这里，目前版本似乎给了36，有什么特殊原因吗？

``` /// Sv39 结构的页表项 #[derive(Copy, Clone, Default)] pub struct PageTableEntry(usize); ``` 这个结构是不是最好是 `repr(transparent)` 的？按 [Rust RFC](https://rust-lang.github.io/rfcs/1758-repr-transparent.html) 描述，感觉 `repr(transparent)` 能比较好控制 `PageTableEntry` 的 abi?

There is none `positive-number-seq` in current workspace, so I changed it to `positive-number`. Signed-off-by: mapleFU

ARROW-17904: [C++] [WIP] Parquet Implement crc in reading and writing Page for DATA_PAGE (v1)

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This patch add crc in writing and reading DATA_PAGE. And crc for dictionary, DATA_PAGE_V2 will be added in comming patches. * [x] Implement crc in writing DATA_PAGE * [x] Implement...