This patch changes the migration path for table updates such that the
base table mutations are sent and applied atomically with the view
schema mutations.
This ensures that after schema merging, we have a consistent mapping
of base table versions to view table versions, which will be used in
later patches.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
There is a workaround for notification race, which attaches keyspace
mutations to other schema changes in case the target node missed the
keyspace creation. Currently that generated keyspace mutations on the
spot instead of using the ones stored in schema tables. Those
mutations would have current timestamp, as if the keyspace has been
just modified. This is problematic because this may generate an
overwrite of keyspace parameters with newer timestamp but with stale
values, if the node is not up to date with keyspace metadata.
That's especially the case when booting up a node without enabling
auto_bootstrap. In such case the node will not wait for schema sync
before creating auth tables. Such table creation will attach
potentially out of date mutations for keyspace metadata, which may
overwrite changes made to keyspace paramteters made earlier in the
cluster.
Refs #2129.
This patch forbids dropping a column family if there are still views
associated with it, and also forbids dropping a view through the drop
table statement.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
There are places in which we need to use the column family object many
times, with deferring points in between. Because the column family may
have been destroyed in the deferring point, we need to go and find it
again.
If we use lw_shared_ptr, however, we'll be able to at least guarantee
that the object will be alive. Some users will still need to check, if
they want to guarantee that the column family wasn't removed. But others
that only need to make sure we don't access an invalid object will be
able to avoid the cost of re-finding it just fine.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <722bf49e158da77ff509372c2034e5707706e5bf.1478111467.git.glauber@scylladb.com>
"Writes may start to be rejected by replicas after issuing alter table
which doesn't affect columns. This affects all versions with alter table
support.
Fixes#1258"
The problem was that "s" would not be marked as synced-with if it came from
shard != 0.
As a result, mutation using that schema would fail to apply with an exception:
"attempted to mutate using not synced schema of ..."
The problem could surface when altering schema without changing
columns and restarting one of the nodes so that it forgets past
versions.
Fixes#1258.
Will be covered by dtest:
SchemaManagementTest.test_prepared_statements_work_after_node_restart_after_altering_schema_without_changing_columns
Commit d3fe0c5 ("Refactor db/keyspace/column_family toplogy") changed
database::find_keyspace() to throw a std::nested_exception so the catch
block in migration_manager::announce_keyspace_drop() no longer catches
the exception. Fix the issue by explicitly checking if the keyspace
exists and throwing the correct exception type if it doesn't.
Fixes TestCQL.keyspace_test.
Message-Id: <1461218910-26691-1-git-send-email-penberg@scylladb.com>
This patch defines the member functions responsible for announce
create, update and drop user defined types migration.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
The verb is just for reporting and debugging purposes, but it is better
not to register it until it can return a meaningful value. Besides, it
really belongs to the migration manager subsystem anyway.
Signed-off-by: Paweł Dziepak <pdziepak@scylladb.com>
Message-Id: <1458037053-14836-1-git-send-email-pdziepak@scylladb.com>
At the momment, the callbacks returns void, it is impossible to wait for
the callbacks to complete. Make the callbacks runs inside seastar
thread, so if we need to wait for the callback, we can make it call
foo_operation().get() in the callback. It is easier than making the
callbacks return future<>.
Defer registering migration manager RPC verbs after commitlog has has
been replayed so that our own schema is fully loaded before other other
nodes start querying it or sending schema updates.
Message-Id: <1457971028-7325-1-git-send-email-penberg@scylladb.com>
Replicates https://issues.apache.org/jira/browse/CASSANDRA-7910 :
"Prepare a statement with a wildcard in the select clause.
2. Alter the table - add a column
3. execute the prepared statement
Expected result - get all the columns including the new column
Actual result - get the columns except the new column"
Currently the notify_*() method family broadcasts to all shards, so
schema merging code invokes them only on shard 0, to avoid doubling
notifications. We can simplify this by making the notify_*() methods
per-instance and thus shard-local.
Replace db_clock::now_in_usec() and db_clock::now() * 1000 accesses
where the intent is to create a new auto-generate cell timestamp with
a call to new_timestamp(). Now the knowledge of how to create timestamps
is in a single place.
There's no need to pass keyspace_metadata to notify_drop_keyspace()
because all we are interested in is the name. The keyspace has been
dropped so there's not much we could do with its metadata either.
Simplifies the next patch that wires up drop keyspace notification.
Signed-off-by: Pekka Enberg <penberg@scylladb.com>
All database code was converted to is when storage_proxy was made
distributed, but then new code was written to use storage_proxy& again.
Passing distributed<> object is safer since it can be passed between
shards safely. There was a patch to fix one such case yesterday, I found
one more while converting.
There's nothing legacy about it so rename legacy_schema_tables to
schema_tables. The naming comes from a Cassandra 3.x development branch
which is not relevant for us in the near future.
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
Remove commented out isReadyForBoostrap. We don't have a StageManager
nor we will so drop the function.
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
Rename "MIGRATION_DELAY_IN_MSEC" to "migration_delay" as the unit of
time is already clear from the type.
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
Use get_storage_proxy() and get_local_storage_proxy() helpers under the
hood to simplify migration manager API users.
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
