The http.client_stats.closed_channels.max_count setting in Elasticsearch controls the maximum number of closed HTTP channels to track for client statistics purposes. This setting helps in monitoring and analyzing the behavior of HTTP connections in Elasticsearch clusters.
Description
- Default value: 500
- Possible values: Any positive integer
- Recommendation: The default value is suitable for most use cases, but you may need to adjust it based on your cluster's size and HTTP traffic patterns.
This setting determines how many closed HTTP channels Elasticsearch will keep track of for statistical purposes. Closed channels are connections that have been terminated but are still relevant for understanding client behavior and connection patterns.
Version Information
This setting was introduced in Elasticsearch 7.7.0 and is available in all subsequent versions.
Example
To change the http.client_stats.closed_channels.max_count setting using the cluster settings API:
PUT _cluster/settings
{
"persistent": {
"http.client_stats.closed_channels.max_count": 1000
}
}
You might want to increase this value if you have a large cluster with high HTTP traffic and need more detailed statistics on closed connections. Increasing this value will allow you to track more closed channels, potentially providing more comprehensive insights into client behavior.
Common Issues and Misuses
- Setting the value too high may consume unnecessary memory, especially in smaller clusters with low HTTP traffic.
- Setting the value too low might result in losing valuable statistical data for troubleshooting connection issues.
Do's and Don'ts
Do's:
- Monitor your cluster's HTTP traffic patterns before adjusting this setting.
- Increase the value gradually if you need more detailed statistics on closed channels.
- Consider the memory impact when increasing this value, especially on larger clusters.
Don'ts:
- Don't set this value unnecessarily high if you don't need extensive closed channel statistics.
- Avoid frequently changing this setting, as it may impact the consistency of your statistical data.
Frequently Asked Questions
Q: How does this setting affect Elasticsearch performance?
A: The http.client_stats.closed_channels.max_count setting has minimal impact on overall Elasticsearch performance. It primarily affects memory usage for storing statistical data and the level of detail available for HTTP client analysis.
Q: Can I disable tracking of closed channels completely?
A: While you can set this value to a very low number, it's not recommended to disable it completely. The statistics provided by this feature can be valuable for troubleshooting and optimizing your cluster's HTTP connections.
Q: How often should I review and adjust this setting?
A: It's best to review this setting during major cluster changes or when you notice issues related to HTTP client connections. Regular adjustments are typically not necessary unless your traffic patterns change significantly.
Q: Does this setting affect all nodes in the cluster?
A: Yes, when set at the cluster level, this setting applies to all nodes. However, you can also configure it at the node level if you need different values for specific nodes.
Q: How can I monitor the current usage of closed channel statistics?
A: You can use the Nodes Stats API to check the current number of tracked closed channels. Look for the http.current_open and http.total_opened metrics to get an idea of your HTTP connection patterns.
