Before least_used fails to detect when the disk started to have more
space, it works only when the disk starts to have less space.
The reason for this is that it uses priority_queue, and once the disk
goes at the bottom of the queue, free space will not be updated for it
until it will be selected again.
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
https://docs.aws.amazon.com/AmazonS3/latest/userguide/UsingKMSEncryption.html
Similar to the server_side_encryption_customer_key_base64 option for
configuring SSE-C with S3, add the following settings to configure
SSE-KMS on a per-endpoint/disk basis:
- server_side_encryption_kms_key_id
- server_side_encryption_kms_encryption_context
- server_side_encryption_kms_bucket_key_enabled
The S3 table engine supports specifying extra HTTP headers in S3
requests to certain endpoints, via the "headers" setting. This commit
adds the same setting to S3 disk config.
After #36425 there was a lot of confusions/problems with configuring pools - when the message was confusing, and settings need to be ajusted in several places.
See some examples in #44251, #43351, #47900, #46515.
The commit includes the following changes:
1) Introduced a unified mechanism for reading pool sizes from the configuration file(s). Previously, pool sizes were read from the Context.cpp with fallbacks to profiles, whereas main_config_reloader in Server.cpp read them directly without fallbacks.
2) Corrected the data type for background_merges_mutations_concurrency_ratio. It should be float instead of int.
3) Refactored the default values for settings. Previously, they were defined in multiple places throughout the codebase, but they are now defined in one place (or two, to be exact: Settings.h and ServerSettings.h).
4) Improved documentation, including the correct message in system.settings.
Additionally make the code more conform with #46550.
