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" Currently inactive readers are stored in two different places: * reader concurrency semaphore * querier cache With the latter registering its inactive readers with the former. This is an unnecessarily complex (and possibly surprising) setup that we want to move away from. This series solves this by moving the responsibility if storing of inactive reads solely to the reader concurrency semaphore, including all supported eviction policies. The querier cache is now only responsible for indexing queriers and maintaining relevant stats. This makes the ownership of the inactive readers much more clear, hopefully making Benny's work on introducing close() and abort() a little bit easier. Tests: unit(release, debug:v1) " * 'unify-inactive-readers/v2' of https://github.com/denesb/scylla: reader_concurrency_semaphore: store inactive readers directly querier_cache: store readers in the reader concurrency semaphore directly querier_cache: retire memory based cache eviction querier_cache: delegate expiry to the reader_concurrency_semaphore reader_concurrency_semaphore: introduce ttl for inactive reads querier_cache: use new eviction notify mechanism to maintain stats reader_concurrency_semaphore: add eviction notification facility reader_concurrency_semaphore: extract evict code into method evict()
Scylla Developer Documentation
This documentation targets developers who are interested in contributing to Scylla codebase.
Contents
- Alternator - The open source DynamoDB-compatible API reference.
- Design notes - Explanations describing how new features work for other contributors and exploratory research.
- Guides - Instructions on how to build, run, test and debug the Scylla codebase.
- Contribute - Guidelines on how to contribute and maintain the project.