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feat: 添加节点参与投票异常监听器 #1100

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@zxuanhong zxuanhong commented Apr 10, 2024

添加节点投票异常监听器,以便为用户提供处理自动加入集群的时机;

Motivation:

  1. 在新节点加入集群或历史节点被移除后再次启动加入集群时,由于缺少触发参与集群投票异常的时机,使得无法做自动加入集群处理。当前pr在新加入集群(参与者不在配置中),或投票提示么有权限(节点被移除后再次启动时);
  2. 对于为什么会出现历史节点移除后再次加入集群。目前出现的原因是,一般系统可能会添加一定心跳时间无法响应时做出自动移除节点(一般是节点下线),后系统再次回复。

Modification:

  1. 在NodeImpl preVote方法配置检查异常时添加peerNotInConf回调方法,处理当前参与者不在配置中(没有加入);
  2. 在NodeImpl handlePreVoteResponse响应提示没有投票权时添加noVotingGranted回调方法,处理当前参与者虽然在本地配置中,但是不在集群配置中,也就是没有投票权(节点被自动移除然后恢复时)。

Summary by CodeRabbit

  • New Features
    • Added functionality to manage NodeStateListener instances, allowing users to subscribe to specific node state changes.
    • Introduced NodeStateListener interface for custom handling of node state events.
  • Documentation
    • Updated comments for enhanced clarity and understanding of the code.

添加节点异常监听器,以便为用户提供自动加入集群的时机;
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coderabbitai bot commented Apr 10, 2024

Walkthrough

The updates to the JRaft library introduce a new NodeStateListener interface and associated management methods in the Node class. This enhancement allows users to add, remove, and manage listeners that can execute custom logic in response to specific node state changes, such as pre-vote failures and configuration discrepancies. These changes are primarily implemented in the core node handling classes, enhancing the library's extensibility and monitoring capabilities.

Changes

File Path Change Summary
.../jraft/Node.java Added methods for managing NodeStateListener instances and introduced NodeStateListener interface.
.../jraft/core/NodeImpl.java Implemented listener management methods and integrated state listener triggers in node state handling.

🐇✨
In the land of code where the data nodes play,
A new listener sprouts, hip hip hooray!
It watches, it triggers, without any delay,
On state changes it dances, in JRaft's ballet.
So here's to the devs, with their code so bright,
May your clusters run smoothly, by day and by night.
🌟🐰


Recent Review Status

Configuration used: CodeRabbit UI

Commits Files that changed from the base of the PR and between 890033a and 285715a.
Files selected for processing (2)
  • jraft-core/src/main/java/com/alipay/sofa/jraft/Node.java (2 hunks)
  • jraft-core/src/main/java/com/alipay/sofa/jraft/core/NodeImpl.java (7 hunks)
Additional comments not posted (4)
jraft-core/src/main/java/com/alipay/sofa/jraft/Node.java (2)

353-371: Ensure thread safety for NodeStateListener management methods.

Verification successful

The verification process has confirmed that the NodeStateListener management methods (addNodeStateListener, removeNodeStateListener, clearNodeStateListener, and getNodeStateListeners) utilize a CopyOnWriteArrayList for storing listeners. This choice of data structure ensures thread safety for the operations performed on the list of NodeStateListener instances, as CopyOnWriteArrayList is designed to handle concurrent modifications safely by making a fresh copy of the underlying array upon modification.

Thus, the implementation of these methods in the NodeImpl class is thread-safe, which aligns with the requirements for concurrent access in a multi-threaded environment like that of SOFAJRaft.

Scripts Executed

The following scripts were executed for the analysis:


Script:

#!/bin/bash
# Verify if the methods are synchronized or if the underlying data structure is thread-safe.
rg --type java 'NodeStateListener' -C 10

Length of output: 17157


418-438: Consider adding documentation for the default methods in NodeStateListener to explain when they should be called and what the expected actions might be.

jraft-core/src/main/java/com/alipay/sofa/jraft/core/NodeImpl.java (2)

2681-2683: Ensure that the peerNotInConf method in the NodeStateListener interface handles exceptions gracefully to prevent potential disruptions in the node's operations if a listener implementation throws an exception.


3458-3478: The methods for managing NodeStateListener instances (add, remove, clear, get) are implemented correctly. Ensure that these methods are thread-safe if NodeImpl instances can be accessed by multiple threads concurrently.

Verification successful

The methods for managing NodeStateListener instances in NodeImpl are thread-safe as they utilize a CopyOnWriteArrayList for nodeStateListeners. This ensures that all modifications and access to the list are handled in a thread-safe manner. Therefore, the implementation aligns with the requirements for thread safety in a concurrent environment.

Scripts Executed

The following scripts were executed for the analysis:


Script:

#!/bin/bash
# Check for any additional synchronization mechanisms around nodeStateListeners usage across the codebase.
rg --type java "nodeStateListeners"

Length of output: 1065


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Actionable comments posted: 3

* @param nodeId current node id
* @param options current node options
*/
default void peerNotInConf(NodeId nodeId, NodeOptions options) {
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Validate parameters in peerNotInConf to ensure they are not null before use.

+ if (nodeId == null || options == null) {
+     throw new IllegalArgumentException("nodeId and options cannot be null");
+ }

Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.

Suggested change
default void peerNotInConf(NodeId nodeId, NodeOptions options) {
default void peerNotInConf(NodeId nodeId, NodeOptions options) {
if (nodeId == null || options == null) {
throw new IllegalArgumentException("nodeId and options cannot be null");
}

* @param nodeId current node id
* @param options current node options
*/
default void noVotingGranted(NodeId nodeId, NodeOptions options) {
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Validate parameters in noVotingGranted to ensure they are not null before use.

+ if (nodeId == null || options == null) {
+     throw new IllegalArgumentException("nodeId and options cannot be null");
+ }

Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.

Suggested change
default void noVotingGranted(NodeId nodeId, NodeOptions options) {
default void noVotingGranted(NodeId nodeId, NodeOptions options) {
if (nodeId == null || options == null) {
throw new IllegalArgumentException("nodeId and options cannot be null");
}

Comment on lines +2631 to +2634
}else{
for(Node.NodeStateListener listener : this.nodeStateListeners) {
RpcUtils.runInThread(() -> listener.noVotingGranted(getNodeId(), options));
}
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Consider using a more robust thread handling mechanism instead of RpcUtils.runInThread for executing listener callbacks to ensure that any exceptions thrown by the listeners do not affect the node's stability.

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