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new 5a622bc4d HDDS-14272. [Website v2] [Docs] [Core Concepts] Ratis (#174)
5a622bc4d is described below
commit 5a622bc4d4a194bfcc6304df1208875b293fd92a
Author: Wei-Chiu Chuang <[email protected]>
AuthorDate: Tue Dec 30 14:18:03 2025 -0800
HDDS-14272. [Website v2] [Docs] [Core Concepts] Ratis (#174)
---
docs/03-core-concepts/02-replication/03-ratis.md | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/docs/03-core-concepts/02-replication/03-ratis.md
b/docs/03-core-concepts/02-replication/03-ratis.md
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--- a/docs/03-core-concepts/02-replication/03-ratis.md
+++ b/docs/03-core-concepts/02-replication/03-ratis.md
@@ -1,3 +1,22 @@
+---
+sidebar_label: Ratis
+---
+
# Ratis
-**TODO:** File a subtask under
[HDDS-9857](https://issues.apache.org/jira/browse/HDDS-9857) and complete this
page or section.
+[Apache Ratis](https://ratis.apache.org/) is a highly customizable open-source
Java implementation
+of the [Raft consensus protocol](https://raft.github.io/). Raft is an easily
understandable consensus
+algorithm designed to manage replicated state. Unlike ZooKeeper or other Raft
implementations such as etcd,
+Ratis is designed as a library rather than a standalone consensus server,
which simplifies its management
+and integration.
+
+Ozone leverages Ratis to replicate system states across multiple nodes,
ensuring high availability and
+redundancy. When using Ratis for replication, each piece of data written by
clients is replicated to 3 Datanodes.
+Within Ozone, Ratis is employed in critical components such as the [Ozone
Manager](../03-namespace/01-overview.md),
+[Storage Container Manager](../01-architecture.md), and Datanodes. It forms
the central pillar for the
+High Availability (HA) mechanisms of both the Ozone Manager (OM-HA) and
Storage Container Manager (SCM-HA).
+
+For more detailed information, please visit the [Apache Ratis
website](https://ratis.apache.org/).
+
+For troubleshooting Ratis problems encountered in production, please refer to
+[Troubleshooting Ratis](/06-troubleshooting/13-ratis.md).
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