RFC: support witness(log only replica) #106
Open
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
Signed-off-by: Connor1996 <[email protected]>
ethercflow
reviewed
Feb 9, 2023
|
|
||
| ## Background | ||
|
|
||
| On cloud env, TiKV is equipped with AWS EBS storage for single node which provides durability of 99.9%. Moreover, TiKV organizes 3 Raft replicas on top of that, which may be a overkill for durability. To reduce cost, we can introduce a mechanism named "2 Replicas With 1 Log Only" instead of 3 replicas to save 30% storage resources and cut down about 100%(1 core) CPU usage empirically on the cloud. Compared with the original 3 replicas architecture, the "1 Log Only" replica stores raft logs but does not apply it, which still ensures data consistency through the Raft protocol. |
There was a problem hiding this comment.
Our usage doc mentioned: Amazon Elastic Block Store (EBS) with 99.8%~99.9% and durability or Persistent Disk of Google Cloud Platform (GCP) with 99.99%~99.999% durability as the storage of each TiKV node. Should we keep with it?
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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Outdated suggestions cannot be applied.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