Naming about VSG and MManager

[Jialin Qiao <qi...@apache.org>]

Hi,

After discussion with Chao Wang and Xiangdong, we'd like to rename some
classes.

(1) VirtualStorageGroupProcessor -> DataRegion
(2) MManager -> SchemaRegion

In each instance, we have a SchemaEngine to manage many SchemaRegion, and a
StorageEngine to manage many DataRegion.

In this way, we are separating data structure with computing. The
DataRegion and SchemaRegion are data structures with supported operations.
The background threads could be managed together in an IoTDB instance, such
as WAL threads and Compaction threads.

What do you think?

Thanks,
—————————————————
Jialin Qiao

Re: Naming about VSG and MManager

[HW-Chao Wang <57...@qq.com.INVALID>]

+1，support named schemaregion and dataregion.we need 
distinguish between previous nouns.


---Original---
From: "Jialin Qiao"<qiaojialin@apache.org&gt;
Date: Tue, Mar 8, 2022 20:54 PM
To: "dev"<dev@iotdb.apache.org&gt;;
Subject: Naming about VSG and MManager


Hi,

After discussion with Chao Wang and Xiangdong, we'd like to rename some
classes.

(1) VirtualStorageGroupProcessor -&gt; DataRegion
(2) MManager -&gt; SchemaRegion

In each instance, we have a SchemaEngine to manage many SchemaRegion, and a
StorageEngine to manage many DataRegion.

In this way, we are separating data structure with computing. The
DataRegion and SchemaRegion are data structures with supported operations.
The background threads could be managed together in an IoTDB instance, such
as WAL threads and Compaction threads.

What do you think?

Thanks,
—————————————————
Jialin Qiao