Most of the methods are marked public, but only few of them should.
Test needs a bit more, however, so the distributed_loader_for_tests
is declared as friend class.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
sstables_manager superseeds previous implementation of sstables_tracker
for tracking lifetime of the tables. Update scylla-gdb.py to use
sstables_manager in a backwards compatible way, as sstables_manager is
not available in Scylla Enterprise 2020.1. Add explicit test for
"scylla sstables" command, as previously only "scylla active-sstables"
was tested.
Closes#9439
pytest supports - if the "repeat" extension is installed - a convenient
and efficient way to repeat the same test (or all of them) multiple times.
Since it's very useful, let's document it in cql-pytest/README.md.
By the way, our test.py also has a "--repeat" option, but it can only run
all cql-pytest tests, not just repeat a single small test, and it is also
slower (and arguably, different) because it restarts Scylla instead of
running a test 100 times on the same Scylla.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20211007122146.624210-1-nyh@scylladb.com>
The test generates random mutations and eliminates mutations whose keys
tokenize to 0, in particular it eliminates mutations with empty
partition keys (which should not end up in sstables).
However it would do that after using the randomly generated mutations to
create their reversed versions. So the reversed versions of mutations
with empty partition keys would stay.
Fix by placing the workaround earlier in the test.
Closes#9447
I stumbled upon this failure in dev mode:
```
test/boost/sstable_conforms_to_mutation_source_test.cc(0): Entering test case "test_sstable_reversing_reader_random_schema"
sstable_conforms_to_mutation_source_test: ./seastar/src/core/fstream.cc:205: virtual seastar::file_data_source_impl::~file_data_source_impl(): Assertion `_reads_in_progress == 0' failed.
Aborting on shard 0.
```
Since dev mode has no debug symbols I can't
decode the stack trace so I'm not 100% sure about
the root cause and I couldn't reproduce it in release
or debug modes yet.
One vulnerability in the current code is that r1
won't be closed if an exception is thrown before r1 and r2
are moved to `compare_readers` so this change adds
a deferred close of r1 in this case.
Test: sstable_conforms_to_mutation_source_test(dev)
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Message-Id: <20211006144009.696412-1-bhalevy@scylladb.com>
This is a translation of Cassandra's CQL unit test source file
validation/operations/SelectOrderByTest.java into our our cql-pytest
framework.
This test file includes 17 tests for various features and corners of
SELECT's "ORDER BY" feature. All these tests pass on Cassandra, but
three fail on Scylla and are marked as xfail:
One previously-unknown Scylla bug:
Refs #9435: SELECT with IN, ORDER BY and function call does not obey
the ORDER BY
And two new reproducers for already known bugs:
Refs #2247: ORDER BY should allow skipping equality-restricted
clustering columns
Refs #7751: Allow selecting map values and set elements, like in
Cassandra 4.0
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20211005174140.571056-1-nyh@scylladb.com>
Ever since we started testing Alternator with tests written in Python
and using Amazon's "boto3" library, one limitation kept annoying us:
Boto3 verifies the validity of the request parameters before passing
them on to the server. It verifies that mandatory parameters are not
missing, that parameters have the right types, and sometimes even the
right ranges - all in the library before ever sending the request.
This meant that in many cases, we couldn't get good test coverage for
Alternator's server-side handling of *wrong* parameters.
As it turns out, it is trivial to tell boto3 to *not* do its client-side
request validation, with the `parameter_validation=False` config flag.
We just never noticed that such a flag existed :-)
So this patch adds this flag. It then fixes a few tests which expected
ParameterValidationError - this error is the client-side validation
failure, but should now be replaced by checking the server-side error.
The patch also adds a couple of invalid parameter checks that we
couldn't do before because of boto3's eagerness to check them on the
client side. We can add a lot more of these error tests in the future,
now that we got rid of client-side validation.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20211005095514.537226-1-nyh@scylladb.com>
This patch adds yet another test for Alternator's unimplemented feature
of adding a GSI to an already existing table (issue #5022), but this
test is for a very specific corner case - tables which contain string
attributes with an empty value - the corner case described in
issue #9424:
DynamoDB used to forbid any string attributes from being set to an empty
string, but this changed in May 2020, and since then empty strings are
allowed - but NOT as keys. So although it is legal to set a string
attribute to an empty string, if this table has a GSI whose key is that
specific attribute, the update command is refused. We already had a
test for this - test_gsi_empty_value.
However, the case in this patch is the case where a GSI is added to a
table *after* the table already has data. In this case (as this test
demonstrates), we are supposed to drop the items which have the empty
string key from the GSI.
Even when #5022 (the ability to add GSIs to existing tables) will be done,
this test will continue to fail. The unique problem of this test is that
Scylla's materialized views *do* allow empty strings as clustering keys
(right now) and even partition keys (after #9375 will be solved), while
we don't want them to enter the GSI. We will probably need to add to the
view's filter, which right now contains (as required) "x IS NOT NULL"
also the filter "x != ''" (when x's type is a string or binary) so that
items with empty-string keys will be dropped.
Refs #5022
Refs #9375
Refs #9424
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20211003170636.477582-1-nyh@scylladb.com>
DynamoDB has a rather baroque definition of numbers, and in particular
it does *not* allow numeric attributes to be set to infinity or NaN.
Although I did check invalid numbers in the past, manually, I was never
able to write a unit test for this in the past - because the boto3
library catches such errors on the client side, and prevents the test from
sending broken requests to the server. So in this patch, I finally came up
with a solution - a context manager client_no_transform() which
yields a client which does NOT do any transformation or validation
on the request's parameters, allowing us to use boto3 to create
improper requests - and test the server's handling of them.
The test in this patch passes - it did not discover a new bug, but
it is a useful regression test and the client_no_transform() trick
can be used in more error-case tests which until now we were unable
to write.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20211004161809.520236-1-nyh@scylladb.com>
This allows us to forward-declare raw_selector, which in turn reduces
indirect inclusions of expression.hh from 147 to 58, reducing rebuilds
when anything in that area changes.
Includes that were lost due to the change are restored in individual
translation units.
Closes#9434
base64.hh pulls in the huge rjson.hh, so if someone just wants
a base64 codec they have to pull in the entire rapidjson library.
Move the json related parts of base64.hh to rjson.hh and adjust
includes and namespaces.
In practice it doesn't make much difference, as all users of base64
appear to want json too. But it's cleaner not to mix the two.
Closes#9433
"
There's a run_mutation_source_tests lib helper that runs a bunch of
tests sequentially. The problem is that it does 4 different flavors
of it each being a certain decoration over provided reader. This
amplification makes some test cases run enormous amount of time
without any chance for parallelizm.
The simplest way to help running those cases in parallel is to teach
the slowest cases to run different flavors of mutation source tests
in dedicated cases. This patch makes it so.
The resulting timings are
dev debug
sequential run: 2m1s 53m50s
--parallel-cases (+ this patch): 1m3s 31m15s
tests: unit(dev, debug)
"
* 'br-parallel-mutation-source-tests' of https://github.com/xemul/scylla:
test: Split multishard combining reader case
test: Split database test case
test: Split run_mutation_source_tests
It's possible that the server drops the snapshot in the same iteration
of `io_fiber` loop as it tries to send it (the sending of messages
happens after snapshot dropping). Handle this case.
Refs #9407.
All the cases in this test also run mutation source tests and the
case with single-fragment buffer takes times more time to execute
than the others.
Splitting this single case so that it runs mutation source tests
flavours in different cases improves the test parallelizm.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
The test_database_with_data_in_sstables_is_a_mutation_source case runs
the mutation source tests in one go. The problem is that on each step
a whole new ks:cf is created which takes the majority of the tests time.
In the end of the day this case is the slowest one in the suite being
up to two times longer (depending on mode) than the #2 on this list.
This patch splits the case into 4 so that each mutation source flavor
is run in separate case.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
There are 4 flavours of mutation source tests that are all ran
sequentially -- plain, reversed and upgrade/downgrade ones that
check v1<->v2 conversions.
This patch splits them all into individual calls so that some
tests may want to have dedicated cases for each. "By default" they
are all run as they were.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
The previous check would find a leader once and assume that it does not
change, and that the first attempt at sending a request to this leader
succeeds. In reality the leader may change at the end of the test (e.g.
it may be in the middle of stepping down when we find it) and in general
it may take some time for the cluster to stabilize. The new check tries
a few times to find a leader and perform a request - until a time limit
is reached.
The commit also removes an incorrect assertion inside in `wait_for_leader`.
Until now reversed queries were implemented inside
`querier::consume_page` (more precisely, inside the free function
`consume_page` used by `querier::consume_page`) by wrapping the
passed-in reader into `make_reversing_reader` and then consuming
fragments from the resulting reversed reader.
The first couple of commits change that by pushing the reversing down below
the `make_combined_reader` call in `table::query`. This allows
working on improving reversing for memtables independently from
reversing for sstables.
We then extend the `index_reader` with functions that allow
reading the promoted index in reverse.
We introduce `partition_reversing_data_source`, which wraps an sstable data
file and returns data buffers with contents of a single chosen partition
as if the rows were stored in reverse order.
We use the reversing source and the extended index reader in
`mx_sstable_mutation_reader` to implement efficient (at least in theory)
reversed single-partition reads.
The patchset disables cache for reversed reads. Fast-forwarding
is not supported in the mx reader for reversed queries at this point.
Details in commit messages. Read the commits in topological order
for best review experience.
Refs: #9134
(not saying "Fixes" because it's only for single-partition queries
without forwarding)
Closes#9281
* github.com:scylladb/scylla:
table: add option to automatically bypass cache for reversed queries
test: reverse sstable reader with random schema and random mutations
sstables: mx: implement reversed single-partition reads
sstables: mx: introduce partition_reversing_data_source
sstables: index_reader: add support for iterating over clustering ranges in reverse
clustering_key_filter: clustering_key_filter_ranges owning constructor
flat_mutation_reader: mention reversed schema in make_reversing_reader docstring
clustering_key_filter: document clustering_key_filter_ranges::get_ranges
The test generates a random set of mutations and creates two readers:
- one by reversing the mutations, creating an sstable out of the result,
and querying it in reverse,
- one by creating an sstable directly from the mutations and querying it
in forward mode.
It checks that the readers give equal results.
The test already managed to find a bug where offsets returned by the
sstable index were interpreted incorrectly as absolute instead of
relative. It also helped find another bug unrelated to reversing (#9352).
Surprisingly few tests use the random schema and random mutation
utilities which seem to be quite powerful.
"
The storage_service is involved in the cdc_generation_service guts
more than needed.
- the bool _for_testing bit is cdc-only
- there's API-only cdc_generation_service getter
- cdc_g._s. startup code partially sits in s._s. one
This patch cleans most of the above leaving only the startup
_cdc_gen_id on board.
tests: unit(dev)
refs: #2795
"
* 'br-storage-service-vs-cdc-2' of https://github.com/xemul/scylla:
api: Use local sharded<cdc::generation_service> reference
main: Push cdc::generation_service via API
storage_service: Ditch for_testing boolean
cdc: Replace db::config with generation_service::config
cdc: Drop db::config from description_generator
cdc: Remove all arguments from maybe_rewrite_streams_descriptions
cdc: Move maybe_rewrite_streams_descriptions into after_join
cdc: Squash two methods into one
cdc: Turn make_new_cdc_generation a service method
cdc: Remove ring-delay arg from make_new_cdc_generation
cdc: Keep database reference on generation_service
We must abort the environment before the ticker as the environment may
require time to keep advancing during abort in order for all operations
to finish, e.g. operations that can finish only due to timeout.
Currently such operations may cause the test to hang indefinitely
at the end.
The test requires a small modification to ensure that
`delivery_queue::push` is not called after the queue was aborted.
Message-Id: <20210930143539.157727-1-kbraun@scylladb.com>
"This series removes layer violation in compaction, and also
simplifies compaction manager and how it interacts with compaction
procedure."
* 'compaction_manager_layer_violation_fix/v4' of github.com:raphaelsc/scylla:
compaction: split compaction info and data for control
compaction_manager: use task when stopping a given compaction type
compaction: remove start_size and end_size from compaction_info
compaction_manager: introduce helpers for task
compaction_manager: introduce explicit ctor for task
compaction: kill sstables field in compaction_info
compaction: kill table pointer in compaction_info
compaction: simplify procedure to stop ongoing compactions
compaction: move management of compaction_info to compaction_manager
compaction: move output run id from compaction_info into task
Since May 2020 empty strings are allowed in DynamoDB as attribute values
(see announcment in [1]). However, they are still not allowed as keys.
We had tests that they are not allowed in keys of LSI or GSI, but missed
tests that they are not allowed as keys (partition or sort key) of base
tables. This patch add these missing tests.
These tests pass - we already had code that checked for empty keys and
generated an appropriate error.
Note that for compatibility with DynamoDB, Alternator will forbid empty
strings as keys even though Scylla *does* support this possibility
(Scylla always supported empty strings as clustering key, and empty
partition keys will become possible with issue #9352).
[1] https://aws.amazon.com/about-aws/whats-new/2020/05/amazon-dynamodb-now-supports-empty-values-for-non-key-string-and-binary-attributes-in-dynamodb-tables/
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20211003122842.471001-1-nyh@scylladb.com>
by setting _alloc_count initially to 0.
The _alloc_count hasn't been explicitely specified. As the allocator has
been usually an automatic variable, _alloc_count had initially some
unspecified contents. This probalby means that cases where the first few
allocations passed and the later one failed, might haven't ever been
tested. Good thing is that most of the users have been transferred to
the Seastar failure injector, which (by accident) has been correct.
Closes#9420
In order to ease future extensions to the information being sent
by the service level configuration change API, we pack the additional
parameters (other the the service level options) to the interface in a
structure. This will allow an easy expansion in the future if more
parameters needs to be sent to the observer.i
Signed-off-by: Eliran Sinvani <eliransin@scylladb.com>
compaction_info must only contain info data to be exported to the
outside world, whereas compaction_data will contain data for
controlling compaction behavior and stats which change as
compaction progresses.
This separation makes the interface clearer, also allowing for
future improvements like removing direct references to table
in compaction.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Today, compactions are tracked by both _compactions and _tasks,
where _compactions refer to actual ongoing compaction tasks,
whereas _tasks refer to manager tasks which is responsible for
spawning new compactions, retry them on failure, etc.
As each task can only have one ongoing compaction at a time,
let's move compaction into task, such that manager won't have to
look at both when deciding to do something like stopping a task.
So stopping a task becomes simpler, and duplication is naturally
gone.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Today, compaction is calling compaction manager to register / deregister
the compaction_info created by it.
This is a layer violation because manager sits one layer above
compaction, so manager should be responsible for managing compaction
info.
From now on, compaction_info will be created and managed by
compaction_manager. compaction will only have a reference to info,
which it can use to update the world about compaction progress.
This will allow compaction_manager to be simplified as info can be
coupled with its respective task, allowing duplication to be removed
and layer violation to be fixed.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
this run id is used to track partial runs that are being written to.
let's move it from info into task, as this is not an external info,
but rather one that belongs to compaction_manager.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Nowadays it purely controls whether or not to inject delays into
timestamps generation by cdc. The same effect can be achieved by
configuring the cdc::generation_service directly.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
This is to push the service towards general idea that each
component should have its own config and db::config to stay
in main.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
This patch adds a reproducer for issue #7586 - that Alternator queries
(Query) operating in reverse order (ScanIndexForward = false) are
artificially limited to 100 MB partitions because of their memory use.
This test generates a partition over 100 MB in size and then tries various
reverse queries on it - with or without Limit, starting at the end or
the middle of the partition. The test currently fails when a reverse query
refuses to operate on such a large partition - the log reports this:
ERROR ... Memory usage of reversed read exceeds hard limit of 104857600
(configured via max_memory_for_unlimited_query_hard_limit), while reading
partition K1H6ON3A1C
With yet-uncommitted reverse-scan improvements, the test proceeds further,
but still fails where we test that a reverse query with Limit not
explicitly specified should still be limited to a certain size (e.g. 1MB)
and cannot return the entire 100 MB partition in one response.
Please note that this is not a comprehensive test for Scylla's reverse
scan implementation: In particular we do not have separate tests for
reverse scan's implementation on different sources - memtables, sstables,
or the cache. Nor do we check all sorts of edge cases. We assume that
Scylla's reverse scan implementation will have its own unit tests
elsewhere that will check these things - and this test can focus on the
Alternator use case.
This test is marked "xfail" because it still fails on Alternator. It is
marked "veryslow" because it's a (relatively) slow test, taking multiple
seconds to set up the 100 MB partition. So run the test with the
pytest options "--runxfail --runveryslow" to see how it fails.
Refs #7586
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20210930063700.407511-1-nyh@scylladb.com>
The cql_config_updater is a sharded<> service that exists in main and
whose goal is to make sure some db::config's values are propagated into
cql_config. There's a more handy updateable_value<> glue for that.
tests: unit(dev)
refs: #2795
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
Message-Id: <20210927090402.25980-1-xemul@scylladb.com>
Recently we observed an OOM caused by the partition based splitting
writer going crazy, creating 1.7K buckets while scrubbing an especially
broken sstable. To avoid situations like that in the future, this patch
provides a max limit for the number of live buckets. When the number of
buckets reach this number, the largest bucket is closed and replaced by
a bucket. This will end up creating more output sstables during scrub
overall, but now they won't all be written at the same time causing
insane memory pressure and possibly OOM.
Scrub compaction sets this limit to 100, the same limit the TWCS's
timestamp based splitting writer uses (implemented through the
classifier -
time_window_compaction_strategy::max_data_segregation_window_count).
Fixes: #9400
Tests: unit(dev)
Closes#9401
There are now 231 translation units that indirectly include commitlog.hh
due to the need to have access to db::commitlog::force_sync.
Move that type to a new file commitlog_types.hh and make it available
without access to the commitlog class.
This reduces the number of translation units that depend on commitlog.hh
to 84, improving compile time.
Unfortunately, defining metrics in Scylla requires some code
duplication, with the metrics declared in one place but exported in a
different place in the code. When we duplicated this code in Alternator,
we accidentally dropped the first metric - for BatchGetItem. The metric
was accounted in the code, but not exported to Prometheus.
In addition to fixing the missing metric, this patch also adds a test
that confirms that the BatchGetItem metric increases when the
BatchGetItem operation is used. This test failed before this patch, and
passes with it. The test only currently tests this for BatchGetItem
(and BatchWriteItem) but it can be later expanded to cover all the other
operations as well.
Fixes#9406
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20210929121611.373074-1-nyh@scylladb.com>
Currently no mutation-source supports reading in reverse natively but
we are working on changing that, adding native reverse read support to
memtable, cache and sstable readers. To ensure that all mutation
sources work in a correct and uniform manner when reading in reverse,
we add a reverse test to the mutation source test suite. This test
reverses the data that it passes to `populate()`, then reads in
forward order (in reverse compared to the data order). For this we use
the currently established reverse read API: reverse schema (schema
order == query order) and half-reversed (legacy) slice. All mutation
sources are prepared to work with reversed reads, using the
`make_reversing_reader()` adapter. As we progress with our native
reverse support, we will replace these adapters with native reversing
support. As part of this, we push down the reversing reader adapter
currently existing on the `query::consume_page()` level, to the
individual mutation sources.
Closes#9384
* github.com:scylladb/scylla:
test: mutation_reader_test: reversed version of test_clustering_order_merger_sstable_set
querier: consume_page(): remove now unused max_size parameter
test/lib: mutation_source_test: test reading in reverse
test: mutation_reader_test: clustering_combined_reader_mutation_source_test: prepare for reading in reverse
test: flat_mutation_reader_test: test_reverse_reader_is_mutation_source: prepare for reading in reverse
test: mutation_reader_test: test_manual_paused_evictable_reader_is_mutation_source: use query schema instead of table schema
treewide: move reversing to the mutation sources
mutation_query: reconcilable_result_builder: document reverse query preconditions
sstable_set: time_series_sstable_set: reverse mode
mutlishard_mutation_query: set max result size on used permits
db/virtual_table: streaming_virtual_table::as_mutation_source(): use query schema instead of table schema
flat_mutation_reader: make_reversing_reader(): add convenience stored slice
mutation_reader: evictable_reader: add reverse read support
flat_mutation_reader: make_flat_mutation_reader_from_fragments(): add reverse read support
flat_mutation_reader: flat_mutation_reader_from_mutations(): add reverse read support
flat_mutation_reader: flat_mutation_reader_from_mutations(): document preconditions
query-request: introduce `half_reverse_slice`
flat_mutation_reader_assertions: log what's expected
"
Backlog tracker isn't updated correctly when facing a schema change, and
may leak a SSTable if compaction strategy is changed, which causes
backlog to be computed incorrectly. Most of these problems happen because
sstable set and tracker are updated independently, so it could happen
that tracker lose track (pun intended) of changes applied to set.
The first patch will fix the leak when strategy is changed, and the third
patch will make sure that tracker is updated atomically with sstable set,
so these kind of problems will not happen anymore.
Fixes#9157
"
* 'fixes_to_backlog_tracker_v4' of github.com:raphaelsc/scylla:
compaction: Update backlog tracker correctly when schema is updated
compaction: Don't leak backlog of input sstable when compaction strategy is changed
compaction: introduce compaction_read_monitor_generator::remove_exhausted_sstables()
compaction: simplify removal of monitors
To ensure all mutation sources uniformly support the current API of
reverse reading: reversed schema and half-reversed slice. This test will
also ensure that once we switch to native-reverse slice, all
mutation-sources will keep on working.
For reversed reads we must adjust the lower/upper bounds used by the
`position_reader_queue` and `clustering_combined_reader`. The bounds are
calculated using the mutation schema, but we need bounds calculated
using the query schema which is reversed.
The mutation source test suite will soon test reads in reverse. Prepare
for this by checking the reversed flag on the slice and not reversing
the data when set. The test will have two modes effectively:
* Forward mode: data is reversed before read, the reversed again during
read.
* Reverse mode: data is already reversed and it is reversed back during
read.
The two might not be the same in case the schema was upgraded or if we
are reading in reverse. It is important to use the passed-in query
schema consistently during a read.
Push down reversing to the mutation-sources proper, instead of doing it
on the querier level. This will allow us to test reverse reads on the
mutation source level.
The `max_size` parameter of `consume_page()` is now unused but is not
removed in this patch, it will be removed in a follow-up to reduce
churn.
