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The names of these states have been the source of confusion ever since they were introduced. Give them names which better reflects their true meaning and gives less room for misinterpretation. The changes are: * active/unused -> active * active/used -> active/need_cpu * active/blocked -> active/await Hopefully the new names do a better job at conveying what these states really mean: * active - a regular admitted permit, which is active (as opposed to an inactive permit). * active/need_cpu - an active permit which was marked as needing CPU for the read to make progress. This permit prevents admission of new permits while it is in this state. * active/await - a former active/need_cpu permit, which has to wait on I/O or a remote shard. While in this state, it doesn't block the admission of new permits (pending other criteria such as resource availability).
Scylla developer documentation
This folder contains developer-oriented documentation concerning the ScyllaDB codebase. We also have a wiki, which contains additional developer-oriented documentation. There is currently no clear definition of what goes where, so when looking for something be sure to check both.
Seastar documentation can be found here.
User documentation can be found on docs.scylladb.com
For information on how to build Scylla and how to contribute visit HACKING.md and CONTRIBUTING.md.