This repository has been archived by the owner on Nov 18, 2024. It is now read-only.
luna: add a draft RFC #241
Closed
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
xxchan
reviewed
Dec 30, 2021
|
|
||
| ## Data Layout | ||
|
|
||
| A collection consists of a `MemStore` and a `BaseStore`. A `MemStore` contains one active memtable and multiple immutable memtables. Immutable memtables are flushed to `BaseStore` as tables. `BaseStore` can organize tables in different ways. For example, a classic LSM-Tree with multiple levels and each level consists of multiple disjoint tables. Tables of a collection are stored as objects in the same `Kernel` bucket. `BaseStore` delegates `Kernel` to schedule background jobs to re-organize tables for performance or garbage collection. |
There was a problem hiding this comment.
No, a table here means something like SSTable.
tisonkun
reviewed
Dec 30, 2021
|
|
||
| A universe consists of a universe master and a set of tablet servers. Tablet servers are organized into tablet groups. Each tablet group serves a disjoint set of tablets for one or more databases. | ||
|
|
||
| A tablet group consists of replicas (tablet servers). A group uses a `Kernel` stream for leader election and commit logs persistance. |
There was a problem hiding this comment.
May you elaborate the leader election algorithm here? "Using a stream" is too abstract to map into implementation :)
There was a problem hiding this comment.
Well, I haven't designed that yet 🤣
|
Closed in favor of #361. |
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Rendered version: https://github.com/huachaohuang/engula/blob/luna-rfc/docs/rfcs/20211230-luna-engine.md
This is still an early draft design document. Send it here to guide future development and will not merge it in a short time. The design will be evolved along with the implementation.