In that level no io_priority_class-es exist. Instead, all the IO happens
in the context of current sched-group. File API no longer accepts prio
class argument (and makes io_intent arg mandatory to impls).
So the change consists of
- removing all usage of io_priority_class
- patching file_impl's inheritants to updated API
- priority manager goes away altogether
- IO bandwidth update is performed on respective sched group
- tune-up scylla-gdb.py io_queues command
The first change is huge and was made semi-autimatically by:
- grep io_priority_class | default_priority_class
- remove all calls, found methods' args and class' fields
Patching file_impl-s is smaller, but also mechanical:
- replace io_priority_class& argument with io_intent* one
- pass intent to lower file (if applicatble)
Dropping the priority manager is:
- git-rm .cc and .hh
- sed out all the #include-s
- fix configure.py and cmakefile
The scylla-gdb.py update is a bit hairry -- it needs to use task queues
list for IO classes names and shares, but to detect it should it checks
for the "commitlog" group is present.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
Closes#13963
No point in going through the vector<mutation> entry-point
just to discover in run time that it was called
with a single-element vector, when we know that
in advance.
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Closes#13733
The series fixes the `make_nonforwardable` reader, it shouldn't emit `partition_end` for previous partition after `next_partition()` and `fast_forward_to()`
Fixes: #12249Closes#12978
* github.com:scylladb/scylladb:
flat_mutation_reader_test: cleanup, seastar::async -> SEASTAR_THREAD_TEST_CASE
make_nonforwardable: test through run_mutation_source_tests
make_nonforwardable: next_partition and fast_forward_to when single_partition is true
make_forwardable: fix next_partition
flat_mutation_reader_v2: drop forward_buffer_to
nonforwardable reader: fix indentation
nonforwardable reader: refactor, extract reset_partition
nonforwardable reader: add more tests
nonforwardable reader: no partition_end after fast_forward_to()
nonforwardable reader: no partition_end after next_partition()
nonforwardable reader: no partition_end for empty reader
row_cache: pass partition_start though nonforwardable reader
This flag designates that we should consume only one
partition from the underlying reader. This means that
attempts to move to another partition should cause an EOS.
When next_partition is called, the buffer could
contain partition_start and possibly static_row.
In this case clear_buffer_to_next_partition will
not remove anything from the buffer and the
reader position should not change. Before this patch,
however, we used to set _end_of_stream=false,
which violated the forwardable-reader
contract - the data of the next partition
was emitted after the data of the first partition
without intermediate EOS.
This bug was found when debugging
test_make_nonforwardable_from_mutations_as_mutation_source flakiness.
A corresponding focused test_make_forwardable_next_partition
has been added to exercise this problem.
This patch fixes the problem with method fast_forward_to
which is similar to the one with next_partition, no
partition_end should be injected for the partition if
fast_forward_to was called inside it.
Before the patch, nonforwardable reader injected
partition_end unconditionally. This caused problems
in case next_partition() was called, the downstream
reader might have already injected its own
partition_end marker, and the one from nonforwardable
reader was a duplicate.
Fixes: #12249
The patch introduces the _partition_is_open flag,
inject partition_end only if there was some data
in the input reader.
A simple unit test has been added for
the nonforwardable reader which checks this
new behaviour.
these warnings are found by Clang-17 after removing
`-Wno-unused-lambda-capture` and '-Wno-unused-variable' from
the list of disabled warnings in `configure.py`.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Schema related files are moved there. This excludes schema files that
also interact with mutations, because the mutation module depends on
the schema. Those files will have to go into a separate module.
Closes#12858
Move mutation-related files to a new mutation/ directory. The names
are kept in the global namespace to reduce churn; the names are
unambiguous in any case.
mutation_reader remains in the readers/ module.
mutation_partition_v2.cc was missing from CMakeLists.txt; it's added in this
patch.
This is a step forward towards librarization or modularization of the
source base.
Closes#12788
We have enabled the command line options without changing a
single line of code, we only had to replace old include
with scylla_test_case.hh.
Next step is to add x-log-compaction-groups options, which will
determine the number of compaction groups to be used by all
instantiations of replica::table.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Memtables and cache will compact eagerly, so tests should not expect
readers to produce exact mutations written, only those which are
equivalant after applying copmaction.
This reverts commit e0670f0bb5, reversing
changes made to 605ee74c39. It causes failures
in debug mode in
database_test.test_database_with_data_in_sstables_is_a_mutation_source_plain,
though with low probability.
Fixes#10780Reopens#652.
Memtables and cache will compact eagerly, so tests should not expect
readers to produce exact mutations written, only those which are
equivalant after applying copmaction.
We want to return stop_iteration::yes once we crossed
the initial depth threshold, with an unsigned depth counter,
it might wraparound and look > 1.
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
"
First migrate all users to the v2 variant, all of which are tests.
However, to be able to properly migrate all tests off it, a v2 variant
of the restricted reader is also needed. All restricted reader users are
then migrated to the freshly introduced v2 variant and the v1 variant is
removed.
Users include:
* replica::table::make_reader_v2()
* streaming_virtual_table::as_mutation_source()
* sstables::make_reader()
* tests
This allows us to get rid of a bunch of conversions on the query path,
which was mostly v2 already.
With a few tests we did kick the can down the road by wrapping the v2
reader in `downgrade_to_v1()`, but this series is long enough already.
Tests: unit(dev), unit(boost/flat_mutation_reader_test:debug)
"
* 'remove-reader-from-mutations-v1/v3' of https://github.com/denesb/scylla:
readers: remove now unused v1 reader from mutations
test: move away from v1 reader from mutations
test/boost/mutation_reader_test: use fragment_scatterer
test/boost/mutation_fragment_test: extract fragment_scatterer into a separate hh
test/boost: mutation_fragment_test: refactor fragment_scatterer
readers: remove now unused v1 reversing reader
test/boost/flat_mutation_reader_test: convert to v2
frozen_mutation: fragment_and_freeze(): convert to v2
frozen_mutation: coroutinize fragment_and_freeze()
readers: migrate away from v1 reversing reader
db/virtual_table: use v2 variant of reversing and forwardable readers
replica/table: use v2 variant of reversing reader
sstables/sstable: remove unused make_crawling_reader_v1()
sstables/sstable: remove make_reader_v1()
readers: add v2 variant of reversing reader
readers/reversing: remove FIXME
readers: reader from mutations: use mutation's own schema when slicing
No external users, only used internally, by make_reader(), who delegates
cases currently unsupported by v2 to it. The code needed from
make_reader_v1() is inlined into make_reader() and the former is
removed.
The v2 format allows for a much simpler reversing mechanism since
clustering fragments can simply be reversed as they are read. Fragments
are directly pushed in the reader's buffer eliminating a separate move
phase.
Existing reverse reader unit tests are converted to test the v2 one.
In most files it was unused. We should move these to the patch which
moved out the last interesting reader from mutation_reader.hh (and added
the corresponding new header include) but its probably not worth the
effort.
Some other files still relied on mutation_reader.hh to provide reader
concurrency semaphore and some other misc reader related definitions.
"
The only real user is view building, which is converted to v2 and then
the v1 version of the mutation from fragments reader is removed.
Tests: unit(dev, release)
"
* 'v2-only-from-fragments-mutations/v1' of https://github.com/denesb/scylla:
readers: remove now unused v1 reader from fragments
test/boost: flat_mutation_reader_test: remove reader from fragments test
replica/table: migrate generate_and_propagate_view_updates() to v2
replica/table: migrate populate_views() to v2
db/view: convert view_update_builder interface to v2
db/view: migrate view_update_builder to v2
This method used to be a static one in
boost/flat_mutation_reader_test.cc. Turns out it is useful for other
tests based on the mutation source test suite, so move it into the
header of the latter to make it accessible.
Depending on the bound weight of the position of the last fragment we
expect to read. Currently the range is unconditionally exclusive, which
might lead to an artificial difference between the read and expected
data, due to a fragment being possibly omitted.
Fixes#10229.
Tests: unit(boost/flat_mutation_reader_test:test_flat_mutation_reader_consume_single_partition)
Signed-off-by: Botond Dénes <bdenes@scylladb.com>
Message-Id: <20220304133515.74586-1-bdenes@scylladb.com>
The flat_mutation_reader files were conflated and contained multiple
readers, which were not strictly necessary. Splitting optimizes both
iterative compilation times, as touching rarely used readers doesn't
recompile large chunks of codebase. Total compilation times are also
improved, as the size of flat_mutation_reader.hh and
flat_mutation_reader_v2.hh have been reduced and those files are
included by many file in the codebase.
With changes
real 29m14.051s
user 168m39.071s
sys 5m13.443s
Without changes
real 30m36.203s
user 175m43.354s
sys 5m26.376s
Closes#10194
Since `flat_reader_assertions::produces(const range_tombstone&,...)`
records the range tombstone for checking, be sure to explicitly pass
in a clustering range that does not extend beyond the mock-read part
of the mutation.
Also (provisionally) change the assertion method to accept clustering
ranges.
Signed-off-by: Michael Livshin <michael.livshin@scylladb.com>
In functions such as upgrade_to_v2 (excerpt below), if the constructor
of transforming_reader throws, r needs to be destroyed, however it
hasn't been closed. However, if a reader didn't start any operations, it
is safe to destruct such a reader. This issue can potentially manifest
itself in many more readers and might be hard to track down. This commit
adds a bool indicating whether a close is anticipated, thus avoiding
errors in the destructor.
Code excerpt:
flat_mutation_reader_v2 upgrade_to_v2(flat_mutation_reader r) {
class transforming_reader : public flat_mutation_reader_v2::impl {
// ...
};
return make_flat_mutation_reader_v2<transforming_reader>(std::move(r));
}
Fixes#9065.
Memtables are a replica-side entity, and so are moved to the
replica module and namespace.
Memtables are also used outside the replica, in two places:
- in some virtual tables; this is also in some way inside the replica,
(virtual readers are installed at the replica level, not the
cooordinator), so I don't consider it a layering violation
- in many sstable unit tests, as a convenient way to create sstables
with known input. This is a layering violation.
We could make memtables their own module, but I think this is wrong.
Memtables are deeply tied into replica memory management, and trying
to make them a low-level primitive (at a lower level than sstables) will
be difficult. Not least because memtables use sstables. Instead, we
should have a memtable-like thing that doesn't support merging and
doesn't have all other funky memtable stuff, and instead replace
the uses of memtables in sstable tests with some kind of
make_flat_mutation_reader_from_unsorted_mutations() that does
the sorting that is the reason for the use of memtables in tests (and
live with the layering violation meanwhile).
Test: unit (dev)
Closes#10120
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
Since this reader is also heavily used by tests to compose a specific
workload for readers above it, we just add a v2 variant, instead of
changing the existing v1 one.
The v2 variant was written from scratch to have built-in support for
reading in reverse. It is built-on `mutation::consume()` to avoid
duplicating the logic of consuming the contents of the mutation.
A v2 native unit test is also added.
The main difference compared to v1 (apart from having _v2 suffix at
relevant places) is how slicing and reversing works. The v2 variant has
native reverse support built-in because the reversing reader is not
something we want to convert to v2.
A native v2 mutation-source test is also added.
Add schema parameter so that:
* Caller has better control over schema -- especially relevant for
reverse reads where it is not possible to follow the convention of
passing the query schema which is reversed compared to that of the
mutations.
* Now that we don't depend on the mutations for the schema, we can lift
the restriction on mutations not being empty: this leads to safer
code. When the mutations parameter is empty, an empty reader is
created.
Add "make_" prefix to follow convention of similar reader factory
functions.
Tests: unit(dev)
Signed-off-by: Botond Dénes <bdenes@scylladb.com>
Message-Id: <20211115155614.363663-1-bdenes@scylladb.com>
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.
This warning can catch a virtual function that thinks it
overrides another, but doesn't, because the two functions
have different signatures. This isn't very likely since most
of our virtual functions override pure virtuals, but it's
still worth having.
Enable the warning and fix numerous violations.
Closes#9347
Check that the reverse reader emits a stream identical to that emitted
by a reader reading in native order from a table with reversed
clustering order.
