thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-23 08:02:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

Update INSERT delay doc properly

Browse Source
This commit is contained in:
Igor Nikonov 2023-01-25 00:26:32 +01:00 committed by GitHub
parent 2b8b1ad5d4
commit 29ef6b9574
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
docs/en/operations/settings/merge-tree-settings.md
View File

@ -106,21 +106,20 @@ Possible values:
Default value: 1.
The delay (in milliseconds) for `INSERT` is calculated by the formula:
```code
max_k = parts_to_throw_insert - parts_to_delay_insert
k = 1 + parts_count_in_partition - parts_to_delay_insert
delay_milliseconds = pow(max_delay_to_insert * 1000, k / max_k)
```
For example, if a partition has 299 active parts and parts_to_throw_insert = 300, parts_to_delay_insert = 150, max_delay_to_insert = 1, `INSERT` is delayed for `pow( 1 * 1000, (1 + 299 - 150) / (300 - 150) ) = 1000` milliseconds.
Starting from version 23.1 formula has been changed to:
```code
allowed_parts_over_threshold = parts_to_throw_insert - parts_to_delay_insert + 1
allowed_parts_over_threshold = parts_to_throw_insert - parts_to_delay_insert
parts_over_threshold = parts_count_in_partition - parts_to_delay_insert + 1
delay_milliseconds = max(min_delay_to_insert_ms, (max_delay_to_insert * 1000) * parts_over_threshold / allowed_parts_over_threshold)
```
For example if a partition has 299 active parts and parts_to_throw_insert = 300, parts_to_delay_insert = 150, max_delay_to_insert = 1, `INSERT` is delayed for `pow( 1 * 1000, (1 + 299 - 150) / (300 - 150) ) = 1000` milliseconds.
For example, if a partition has 224 active parts and parts_to_throw_insert = 300, parts_to_delay_insert = 150, max_delay_to_insert = 1, min_delay_to_insert_ms = 10, `INSERT` is delayed for `max( 10, 1 * 1000 * (224 - 150 + 1) / (300 - 150) ) = 500` milliseconds.
## max_parts_in_total {#max-parts-in-total}