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https://issues.apache.org/jira/browse/RATIS-1864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17785711#comment-17785711
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Song Ziyang commented on RATIS-1864:
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[~szetszwo] Sure, let me resolve this issue.
> Support leader lease
> --------------------
>
> Key: RATIS-1864
> URL: https://issues.apache.org/jira/browse/RATIS-1864
> Project: Ratis
> Issue Type: New Feature
> Components: client, gRPC, Linearizable Read, server
> Reporter: Song Ziyang
> Assignee: Song Ziyang
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> h2. Proposal: Introducing Leader Lease Read into Ratis
> h3. Objective:
> The primary objective of this proposal is to introduce the Leader Lease Read
> feature into Ratis, enhancing the read capabilities and addressing the
> existing limitations in the current implementation.
> h3. Current Implementation:
> At present, Ratis supports two read operations:
> # Leader Bypass Read: This type of read operation offers improved latency
> and throughput. However, it is constrained to the leader and may produce
> inconsistent results.
> # Server Linearizable Read (ReadIndex): This type allows clients to read
> from any server, ensuring linearizability but suffers from suboptimal
> latency. Experiments from Alluxio [~liuyaolong] shows a 20-30% dropdown in
> throughput when switch to ReadIndex from bypass read.
> h3. Reasons for the Proposed Feature:
> To address the limitations, I propose to incorporate the Leader Lease Read
> type into Ratis.
> This feature has already been validated by other communities, such as
> Sofa-Jraft, where it resulted in a remarkable 15% improvement in throughput
> performance.
> Additionally, some of our downstream dependents, like IoTDB, demand
> low-latency read capabilities to efficiently serve time-series queries.
> h3. References:
> # Previous community discussions on Leader Lease in RATIS-1273 and relevant
> contributions on
> [https://github.com/apache/ratis/pull/383|https://github.com/apache/ratis/pull/383.]
> # Quantitative results showcasing the benefits of Leader Lease Read can be
> found at [https://www.sofastack.tech/en/projects/sofa-jraft/jraft-user-guide/
> |https://www.sofastack.tech/en/projects/sofa-jraft/jraft-user-guide/]in
> Section 5. Linearizable read.
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