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https://issues.apache.org/jira/browse/RATIS-1557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz-wo Sze resolved RATIS-1557.
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Fix Version/s: 2.5.0
Resolution: Fixed
Let's resolve this since the Read Index algorithm is already done. Thanks
everyone!
> Support linearizable read from followers (Read Index)
> -----------------------------------------------------
>
> Key: RATIS-1557
> URL: https://issues.apache.org/jira/browse/RATIS-1557
> Project: Ratis
> Issue Type: New Feature
> Components: Linearizable Read
> Reporter: Xinyu Tan
> Assignee: Song Ziyang
> Priority: Major
> Labels: gsoc2022, mentor
> Fix For: 2.5.0
>
> Attachments: 700_review.patch, Proposal-Support leader readIndex.pdf,
> image-2022-04-03-23-42-58-922.png, image-2022-04-07-12-27-45-677.png,
> image-2022-04-07-12-28-43-122.png
>
> Time Spent: 6.5h
> Remaining Estimate: 0h
>
> Raft algorithm not only allows linearizable read through Read Index or Lease
> Read, but also allows linearizable read on the follower nodes, which can
> increase the read throughput linearly with the number of nodes. Algorithm
> specific processes can refer to Raft thesis in [section
> 6.4|https://web.stanford.edu/~ouster/cgi-bin/papers/OngaroPhD.pdf]
> Our project, Apache IoTDB, is trying to build our high availability module
> using Ratis. We want Ratis to support linearizable follower read so that we
> can mask the concept of replicas for upper layers, that is, reading the
> latest data at any node.
> In our survey, sofa-jraft, etcd, tikv-rs and other famous consensus
> algorithms libraries have supported linearizable follower read. As the only
> consensus algorithm library under the Apache Foundation, we expect Ratis to
> support this feature as well, and I'm happy to participate in further
> discussions and development.
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