Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.
Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.
The changes we applied mechanically with a script, except to
licenses/README.md.
Closes#9937
Up until now, the global_schema_ptr object was a crack
through which a view schema with an uninitialized base
reference could sneak. Even if the schema itself contained a
base reference, the base schema didn't carry over to shards
different than the shard on which the global_schema_ptr was
created.
Since once the schema is in the registry it might be used for
everything (reads and writes), we also need to make sure that
global schemas for an incomplete view schemas will not be created.
Introduce new database config option `schema_registry_grace_period`
describing the amount of time in seconds after which unused schema
versions will be cleaned up from the schema registry cache.
Default value is 1 second, the same value as was hardcoded before.
Tests: unit(debug)
Refs: #7225
Signed-off-by: Pavel Solodovnikov <pa.solodovnikov@scylladb.com>
Message-Id: <20200915131957.446455-1-pa.solodovnikov@scylladb.com>
The header sits in many other headers, but there's a handy
schema_fwd.hh that's tiny and contains needed declarations
for other headers. So replace shema.hh with schema_fwd.hh
in most of the headers (and remove completely from some).
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
Message-Id: <20200303102050.18462-1-xemul@scylladb.com>
Throwing move constructors are a a pain; so we should try to make
them noexcept. Currently, global_schema_ptr's move constructor
throws an exception if used illegaly (moving from a different shard);
this patch changes it to an assert, on the grounds that this error
is impossible to recover from.
The direct motivation for the patch is the desire to store objects
containing a global_schema_ptr in a chunked_vector, to move lists
of partition keys across shards for the topppartitions functionality.
chunked_vector currently requires noexcept move constructors for its
value_type.
Replace stdx::optional and stdx::string_view with the C++ std
counterparts.
Some instances of boost::variant were also replaced with std::variant,
namely those that called seastar::visit.
Scylla now requires GCC 8 to compile.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
Message-Id: <20190108111141.5369-1-duarte@scylladb.com>
Requires "workaround" fix for schema_registry and frozen_mutation, since
the former is a free-float thread local, and the latter is a pure data
carrier. frozen_schema can take a parameter for unfreeze, but schema
registry requires being told which the system extensions are.
This is in order to avoid frequent misses which have a relatively high
cost. A miss means we need to fetch schema definition from another
node and in case of writes do a schema merge.
If the schema is kept alive only by the incoming request, then it
will be forgotten immediately when the request is done, and the next
request using the same schema version will miss again.
Refs #2608.
Message-Id: <1500632447-10104-1-git-send-email-tgrabiec@scylladb.com>
When loading a schema asynchronously, we're leaving a strong
reference to the loaded schema in the entry's shared future. This
patch fixed this by storing a shared_promised, which is reset when the
schema is loaded.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
Message-Id: <20170220193654.17439-1-duarte@scylladb.com>
We need to track which schema version were synced with on current node
to avoid triggering the sync on every mutation. We need to sync before
mutating to be able to apply the incoming mutation using current
node's schema, possibly applying irreverdible transformations to it to
make it conform.
