feature:ETCD key value mvcc

[gongna-au]

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Summary by CodeRabbit

• New Features

  • Introduced a new Markdown file with a complete Go implementation for managing key-value pairs using etcd.
  • Added functionality for creating an etcd client, retrieving key values, and handling updates with multi-version concurrency control (MVCC).
  • Implemented error handling and lifecycle management for key-value pairs.

• Documentation

  • Added a comprehensive explanation of the new key-value management features and their usage.

[coderabbitai]

Walkthrough

This pull request introduces a new Markdown file that contains a complete Go implementation for managing key-value pairs using etcd with multi-version concurrency control (MVCC). The implementation includes functions for creating an etcd client, retrieving key values, managing key-value lifecycle, and handling concurrency. It defines a LocalKeyValue struct for encapsulating key, value, and revision data, along with methods for reading and writing values. The main function orchestrates the flow of operations, emphasizing error handling and synchronization with etcd.

Changes

File Path	Change Summary
_posts/2024-11-11-test-markdown.md	Added a complete Go implementation for managing key-value pairs with etcd, including functions for client creation, key retrieval, lifecycle management, and concurrency handling. New struct and methods defined for key-value operations.

Poem

In the burrow where code does play,
A new client hops in, bright as day.
With keys and values, oh what a sight,
Watching changes, all day and night!
Error handling, smooth as a breeze,
In our code garden, we code with ease! 🐇✨

---

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[coderabbitai]

Actionable comments posted: 4

🧹 Outside diff range and nitpick comments (2)

_posts/2024-11-11-test-markdown.md (2)

1-7: Consider adding more descriptive metadata

The front matter is properly formatted but could benefit from:

• A more descriptive subtitle explaining the MVCC implementation
• Additional tags like "ETCD", "MVCC", "Distributed-Systems"

---

92-116: Enhance MVCC write implementation

The Write method's transaction implementation could be improved for better error handling and clarity.

Consider:

1. Adding context with timeout
2. Improving error messages
3. Adding retry mechanism for write conflicts

-func (lkv *LocalKeyValue) Write(cli *clientv3.Client, newValue string) error {
+func (lkv *LocalKeyValue) Write(ctx context.Context, cli *clientv3.Client, newValue string) error {
+    const maxRetries = 3
+    var attempt int
+    for attempt < maxRetries {
+        if err := lkv.tryWrite(ctx, cli, newValue); err != nil {
+            if err == ErrWriteConflict && attempt < maxRetries-1 {
+                attempt++
+                time.Sleep(time.Duration(attempt) * 100 * time.Millisecond)
+                continue
+            }
+            return err
+        }
+        return nil
+    }
+    return fmt.Errorf("failed to write after %d attempts", maxRetries)
 }

🧰 Tools

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📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between bf58608 and da6cc4b.

📒 Files selected for processing (1)

• _posts/2024-11-11-test-markdown.md (1 hunks)

🧰 Additional context used

🪛 Markdownlint

_posts/2024-11-11-test-markdown.md

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