Accelerating TTL Operations
When TTL is triggered in ClickHouse, a large amount of CPU and memory are consumed.
Log in to FusionInsight Manager and choose Cluster > Services > ClickHouse. Click Configurations then All Configurations. Click ClickHouseServer > Customization, find the clickhouse-config-customize parameter, add the following parameters, save the configuration, and restart the service.
Configuration Item |
Reference Value |
Description |
|---|---|---|
merge_tree.max_replicated_merges_with_ttl_in_queue |
Half of number of CPU cores |
Number of tasks that allow TTL to merge parts concurrently in the ReplicatedMergeTree queue. |
merge_tree.max_number_of_merges_with_ttl_in_pool |
Number of CPU cores |
The thread pool that allows TTL to merge parts in the ReplicatedMergeTree queue. |
Do not modify these configurations when the cluster writes heavily. Idle threads need to be reserved for regular Merge operations to avoid the "Too many parts" issue.
Feedback
Was this page helpful?
Provide feedbackThank you very much for your feedback. We will continue working to improve the documentation.
