cinder/releasenotes/notes/tpool-size-11121f78df24db39...

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---
features:
- Adds support to configure the size of the native thread pool used by the
cinder volume and backup services. For the backup we use
`backup_native_threads_pool_size` in the `[DEFAULT]` section, and for the
backends we use `backend_native_threads_pool_size` in the driver section.
fixes:
- Fixes concurrency issue on backups, where only 20 native threads could be
concurrently be executed. Now default will be 60, and can be changed with
`backup_native_threads_pool_size`.
- RBD driver can have bottlenecks if too many slow operations are happening
at the same time (for example many huge volume deletions), we can now use
the `backend_native_threads_pool_size` option in the RBD driver section to
resolve the issue.