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Part of the vnodes-to-tablets migration is to reshard the SSTables of each node on vnode boundaries. Resharding is a heavy operation that runs on startup while the node is offline. Since nodes can restart for unexpected reasons, we need a flag to do it in a controllable way. We also need the ability to roll back the migration, which requires resharding in the opposite direction. This means a node must be aware of the intended migration direction. To address both requirements, this patch introduces a new column, intended_storage_mode, in system.topology. A non-null value indicates that a node should perform a migration and specifies the migration direction. Signed-off-by: Nikos Dragazis <nikolaos.dragazis@scylladb.com>
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.