To prepare for a seastar change that adds an optional file_permissions
parameter to touch_directory and recursive_touch_directory.
This change messes up the call to io_check since the compiler can't
derive the Func&& argument. Therefore, use a lambda function instead
to wrap the call to {recursive_,}touch_directory.
Ref #4395
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Message-Id: <20190421085502.24729-1-bhalevy@scylladb.com>
1. All nodes in the cluster have to support MC_SSTABLE_FEATURE
2. When a node observes that whole cluster supports MC_SSTABLE_FEATURE
then it should start using MC format.
3. Once all shards start to use MC then a node should broadcast that
unbounded range tombstones are now supported by the cluster.
4. Once whole cluster supports unbounded range tombstones we can
start accepting them on CQL level.
tests: unit(release)
Fixes#4205Fixes#4113
* seastar-dev.git dev/haaawk/enable_mc/v11:
system_keyspace: Add scylla_local
system_keyspace: add accessors for SCYLLA_LOCAL
storage_service: add _sstables_format field
feature: add when_enabled callbacks
system_keyspace: add storage_service param to setup
Add sstable format helper methods
Register feature listeners in storage_service
Add service::read_sstables_format
Use read_sstables_format in main.cc
Use _sstables_format to determine current format
Add _unbounded_range_tombstones_feature
Update supported features on format change
Before this patch raw_builder would always start with an empty list of
user types. This means that every time a type is added to a keyspace,
every type in that keyspace needs to be recreated.
With this patch we pass a keyspace_metadata instead of just the
keyspace name and can construct new user types on top of previous
ones.
This will be used in the followup patch, where only new types are
created.
Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
The goal of the sstables manager is to track and manage sstables life-cycle.
There is a sstable manager instance per database and it is passed to each column-family
(and test environment) on construction.
All sstables created, loaded, and deleted pass through the sstables manager.
The manager will make sure consumers of sstables are in sync so that sstables
will not be deleted while in use.
Refs #4149
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
"
Currently any large partitions found during shutdown are not
recorded. The reason is that the database commit log is already off,
so there is nowhere to record it to.
One possible solution is to have an independent system database. With
that the regular db is shutdown first and writes can continue to the
system db.
That is a pretty big change. It would also not allow us to record
large partitions in any system tables.
This patch series instead tries to stop the commit log later. With
that any large partitions are recorded to the log and moved to a
sstable on the next startup.
"
* 'espindola/shutdown-order-patches-v7' of https://github.com/espindola/scylla:
db: stop the commit log after the tables during shutdown
db: stop the compaction manager earlier
db: Add a stop_database helper
db: Don't record large partitions in system tables
Truncating a table is very slow if the system is under pressure. Because
in that case we mostly just want to get rid of the existing data, it
shouldn't take this long. The problem happens because truncate has to
wait for memtable flushes to end, twice. This is regardless of whether
or not the table being truncated has any data.
1. The first time is when we call truncate itself:
if auto_snapshot is enabled, we will flush the contents of this table
first and we are expected to be slow. However, even if auto_snapshot is
disabled we will still do it -- which is a bug -- if the table is marked
as durable. We should just not flush in this case and it is a silly bug.
1. The second time is when we call cf->stop(). Stopping a table will
wait for a flush to finish. At this point, regardless of which path
(Durable or non-durable) we took in the previous step we will have no
more data in the table. However, calling `flush()` still need to acquire
a flush_permit, which means we will wait for whichever memtable is
flushing at that very moment to end.
If the system is under pressure and a memtable flush will take many
seconds, so will truncate. Even if auto_snapshots are enabled, we
shouldn't have to flush twice. The first flush should already put is in
a state in which the next one is immediate (maybe holding on to the
permit, maybe destroying the memtable_list already at that point ->
since no other memtables should be created).
If auto_snapshots are not enabled, the whole thing should just be
instantaneous.
This patchset fixes that by removing the flush need when !auto_snapshot,
and special casing the flush of an empty table.
Fixes#4294
* git@github.com:glommer/scylla.git slowtruncate-v2:
database: immediately flush tables with no memtables.
truncate: do not flush memtables if auto_snapshot is false.
This allows for system.large_partitions to be updated if a large
partition is found while writing the last sstables.
Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
We want to finish all large data logging in stop_system, so stopping
the compaction manager should be the first thing stop_system does.
The make_ready_future<>() will be removed in a followup patch.
Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
Right now we flush memtables if the table is durable (which in practice
it almost always is).
We are truncating, so we don't want the data. We should only flush if
auto_snapshot is true.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
If a table has no data, it may still take a long time to flush. This is
because before we even try to flush, we need go acquire a permit and
that can take a while if there is a long running flush already queued.
We can special case the situation in which there is no data in any of
the memtables owned by table and return immediately.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
"
This fixes#3988.
We already have a system.large_partitions, but only a warning for
large rows. These patches close the gap by also recording large rows
into a new system.large_rows.
"
* 'espindola/large-row-add-table-v6' of https://github.com/espindola/scylla:
Add a testcase for large rows
Populate system.large_rows.
Create a system.large_rows table
Extract a key_to_str helper
Don't call record_large_rows if stopped
Add a delete_large_rows_entries method to large_data_handler
db::large_data_handler::(maybe_)?record_large_rows: Return future<> instead of void
Rename maybe_delete_large_partitions_entry
Rename log_large_row to record_large_rows
Rename maybe_log_large_row to maybe_record_large_rows
This is analogous to the system.large_partitions table, but holds
individual rows, so it also needs the clustering key of the large
rows.
Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
Split the update_schema_version_and_announce() into
update_schema_version() and announce_schema_version(). This is going to
be used in storage_service::prepare_to_join() where we want to first
update the schema version, start gossip, announce the schema version.
The included testcase used to crash because during database::stop() we
would try to update system.large_partition.
There doesn't seem to be an order we can stop the existing services in
cql_test_env that makes this possible.
This patch then adds another step when shutting down a database: first
stop updating system.large_partition.
This means that during shutdown any memtable flush, compaction or
sstable deletion will not be reflected in system.large_partition. This
is hopefully not too bad since the data in the table is TTLed.
This seems to impact only tests, since main.cc calls _exit directly.
Tests: unit (release,debug)
Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
Message-Id: <20190213194851.117692-1-espindola@scylladb.com>
Previously it was the responsibility of the layer above (multishard
combining reader) to pause readers, which happened via an explicit
`pause()` call. This proved to be a very bad design as we kept finding
spots where the multishard reader should have paused the reader to avoid
potential deadlocks (due to starved reader concurrency semaphores), but
didn't.
This commit moves the responsibility of pausing the reader into the
shard reader. The reader is now kept in a paused state, except when it
is actually used (a `fill_buffer()` or `fast_forward_to()` call is
executing). This is fully transparent to the layer above.
As a side note, the shard reader now also hides when the reader is
created. This also used to be the responsibility of the multishard
reader, and although it caused no problems so far, it can be considered
a leak of internal details. The shard reader now automatically creates
the remote reader on the first time it is attempted to be used.
The code has been reorganized, such that there is now a clear separation
of responsibilities. The multishard combining reader handles the
combining of the output of the shard readers, as well as issuing
read-aheads. The shard reader handles read-ahead and creating the
remote reader when needed, as well as transferring the results of remote
reads to the "home" shard. The remote reader
(`shard_reader::remote_reader`, new in this patch) handles
pausing-resuming as well as recreating the reader after it was evicted.
Layers don't access each other's internals (like they used to).
After this commit, the reader passed to `destroy_reader()` will always
be in paused state.
Reader creation happens through the `reader_lifecycle_policy` interface,
which offers a `create_reader()` method. This method accepts a shard
parameter (among others) and returns a future. Its implementation is
expected to go to the specified shard and then return with the created
reader. The method is expected to be called from the shard where the
shard reader (and consequently the multishard reader) lives. This API,
while reasonable enough, has a serious flaw. It doesn't make batching
possible. For example, if the shard reader issues a call to the remote
shard to fill the remote reader's buffer, but finds that it was evicted
while paused, it has to come back to the local shard just to issue the
recreate call. This makes the code both convoluted and slow.
Change the reader creation API to be synchronous, that is, callable from
the shard where the reader has to be created, allowing for simple call
sites and batching.
This change requires that implementations of the lifecycle policy update
any per-reader data-structure they have from the remote shard. This is
not a problem however, as these data-structures are usually partitioned,
such that they can be accessed safely from a remote shard.
Another, very pleasant, consequence of this change is that now all
methods of the lifecycle interface are sync and thus calls to them
cannot overlap anymore.
This patch also removes the
`test_multishard_combining_reader_destroyed_with_pending_create_reader`
unit test, which is not useful anymore.
For now just emulate the old interface inside shard reader. We will
overhaul the shard reader after some further changes to minimize
noise.
The shard reader relies on the `reader_lifecycle_policy` for pausing and
resuming the remote reader. The lifecycle policy's API was designed to
be as general as possible, allowing for any implementation of
pause/resume. However, in practice, we have a single implementation of
pause/resume: registering/unregistering the reader with the relevant
`reader_concurrency_semaphore`, and we don't expect any new
implementations to appear in the future.
Thus, the generic API of the lifecycle policy, is needlessly abstract
making its implementations needlessly complex. We can instead make this
very concrete and have the lifecycle policy just return the relevant
semaphore, removing the need for every implementor of the lifecycle
policy interface to have a duplicate implementation of the very same
logic.
For now just emulate the old interface inside shard reader. We will
overhaul the shard reader after some further changes to minimize noise.
Right now Cassandra SSTables with counters cannot be imported into
Scylla. The reason for that is that Cassandra changed their counter
representation in their 2.1 version and kept transparently supporting
both representations. We do not support their old representation, nor
there is a sane way to figure out by looking at the data which one is in
use.
For safety, we had made the decision long ago to not import any
tables with counters: if a counter was generated in older Cassandra, we
would misrepresent them.
In this patch, I propose we offer a non-default way to import SSTables
with counters: we can gate it with a flag, and trust that the user knows
what they are doing when flipping it (at their own peril). Cassandra 2.1
is by now pretty old. many users can safely say they've never used
anything older.
While there are tools like sstableloader that can be used to import
those counters, there are often situations in which directly importing
SSTables is either better, faster, or worse: the only option left. I
argue that having a flag that allow us to import them when we are sure
it is safe is better than having no option at all.
With this patch I was able to successfully import Cassandra tables with
counters that were generated in Cassandra 2.1, reshard and compact their
SSTables, and read the data back to get the same values in Scylla as in
Cassandra.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <20190210154028.12472-1-glauber@scylladb.com>
"
This series prevents view building to fall back to storing hints.
Instead, it will try to send hints to an endpoint as if it has
consistency level ONE, and in case of failure retry the whole
building step. Then, view building will never be marked as finished
prematurely (because of pending hints), which will help avoid
creating inconsistencies when decommissioning a node from the cluster.
Tests:
unit (release)
dtest (materialized_views_test.py.*)
Fixes#3857Fixes#4039
"
* 'do_not_mark_view_as_built_with_hints_7' of https://github.com/psarna/scylla:
db,view: add updating view_building_paused statistics
database: add view_building_paused metrics
table: make populate_views not allow hints
db,view: add allow_hints parameter to mutate_MV
storage_proxy: add allow_hints parameter to send_to_endpoint
This commit declares shared_ptr<user_types_metadata> in
database.hh were user_types_metadata is an incomplete type so
it requires
"Allow to use shared_ptr with incomplete type other than sstable"
to compile correctly.
Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com>
Currently nop_large_partition_handler is only used in tests, but it
can also be used avoid self-reporting.
Tests: unit(Release)
I also tested starting scylla with
--compaction-large-partition-warning-threshold-mb=0.
Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
Message-Id: <20190123205059.39573-1-espindola@scylladb.com>
Recently we had a bug (#4096) due to a component
(`multishard_mutation_query()`) assuming that all reads used the
semaphore obtainable via `database::user_read_concurrency_sem()`.
This problem revealed that it is plain wrong to allow access to the
shard-global semaphores residing in the database object. Instead all
code wishing to access the relevant semaphore for some read, should do
so via the relevant `table` object, thus guaranteeing that it will get
the correct semaphore, configured for that table.
Signed-off-by: Botond Dénes <bdenes@scylladb.com>
Message-Id: <4f3a6780eb3240822db34aba7c1ba0a675a96592.1547734212.git.bdenes@scylladb.com>
This long slow-path function is called four times, so de-templating it is an
easy win. We use std::function instead of noncopyable_function because the
function is copied within the parallel_for_each callback. The original code
uses a move, which is incorrect, but did not fail because moving the lambdas
that were used as the actual arguments is equivalent to a copy.
"
This mini-series adds counters for the inactive reads registered in the
reader concurrency semaphore.
"
* 'reader-concurrency-semaphore-counters/v6' of https://github.com/denesb/scylla:
tests/querier_cache: use stats to get the no. of inactive reads
reader_concurrency_semaphore: add counters for inactive reads
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>
distributed_loader is a sizeable fraction of database.cc, so moving it
out reduces compile time and improves readability.
Message-Id: <20181230200926.15074-1-avi@scylladb.com>
Implementation of nodetool toppartiotion query, which samples most frequest PKs in read/write
operation over a period of time.
Content:
- data_listener classes: mechanism that interfaces with mutation readers in database and table classes,
- toppartition_query and toppartition_data_listener classes to implement toppartition-specific query (this
interfaces with data_listeners and the REST api),
- REST api for toppartitions query.
Uses Top-k structure for handling stream summary statistics (based on implementation in C*, see #2811).
What's still missing:
- JMX interface to nodetool (interface customization may be required),
- Querying #rows and #bytes (currently, only #partitions is supported).
Fixes#2811
* https://github.com/avikivity/scylla rafie_toppartitions_v7.1:
top_k: whitespace and minor fixes
top_k: map template arguments
top_k: std::list -> chunked_vector
top_k: support for appending top_k results
nodetool toppartitions: refactor table::config constructor
nodetool toppartitions: data listeners
nodetool toppartitions: add data_listeners to database/table
nodetool toppartitions: fully_qualified_cf_name
nodetool toppartitions: Toppartitions query implementation
nodetool toppartitions: Toppartitions query REST API
nodetool toppartitions: nodetool-toppartitions script
Add data_listeners member to database.
Adds data_listeners* to table::config, to be used by table methods to invoke listeners.
Install on_read() listener in table::make_reader().
Install on_write() listener in database::apply_in_memory().
Tests: Unit (release)
Signed-off-by: Rafi Einstein <rafie@scylladb.com>
Rather than forcing callers to go through get_config(), provide a
direct accessor. This reduces dependencies on config.hh, and will
allow separation of extensions from configuration.
View building sends view updates synchronously, which has natural
backpressure. However, they
1) Contribute to the load on the view replicas, and;
2) Add memory pressure to the base replica.
They should thus count towards the current view update backlog, and
consume units from the view update concurrency semaphore.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
