tmpdir is a helper class representing a temporary directory.
Unfortunately, it suffers for some problems such as lack of proper
encapsulation and weak typing. This has caused bugs in the past when the
user code accidentally modified the member variable with the path to the
directory.
This patch modernises tmpdir and updates its users. The path is stored
in a std::filesystem::path and available read-only to the class users.
mkdtemp and boost are replaced by standard solution.
The users are update to use path more (when it didn't involve too many
changes to their code) and stop using lw_shared_ptr to store the tmpdir
when it wasn't necessary.
tmpdir intentionally doesn't provide any helpers for getting the path as
a string in order to discourage weak types.
Message-Id: <20190207145727.491-1-pdziepak@scylladb.com>
Committer: Avi Kivity <avi@scylladb.com>
Branch: next
Switch to the the CMake-ified Seastar
This change allows Scylla to be compiled against the `master` branch of
Seastar.
The necessary changes:
- Add `-Wno-error` to prevent a Seastar warning from terminating the
build
- The new Seastar build system generates the pkg-config files (for
example, `seastar.pc`) at configure time, so we don't need to invoke
Ninja to generate them
- The `-march` argument is no longer inherited from Seastar (correctly),
so it needs to be provided independently
- Define `SEASTAR_TESTING_MAIN` so that the definition of an entry
point is included for all unit test compilation units
- Independently link Scylla against Seastar's compiled copy of fmt in
its build directory
- All test files use the (now public) Seastar testing headers
- Add some missing Seastar headers to source files
[avi: regenerate frozen toolchain, adjust seastar submoule]
Signed-off-by: Jesse Haber-Kucharsky <jhaberku@scylladb.com>
Message-Id: <02141f2e1ecff5cbcd56b32768356c3bf62750c4.1548820547.git.jhaberku@scylladb.com>
When reading the header chunk of a commitlog file, check the stored id
value against the id derived from the file name, and ignore if
mismatched. This is a prerequisite for re-using renamed commitlog files,
as we can then fail-fast should one such be left on disk, instead of
trying to replay it.
We also check said id via the CRC check for each chunk parsed. If we
find a chunk with
mismatched id, we will get a CRC error for the chunk, and replay will
terminate (albeit not gracefully).
* seastar d59fcef...b924495 (2):
> build: Fix protobuf generation rules
> Merge "Restructure files" from Jesse
Includes fixup patch from Jesse:
"
Update Seastar `#include`s to reflect restructure
All Seastar header files are now prefixed with "seastar" and the
configure script reflects the new locations of files.
Signed-off-by: Jesse Haber-Kucharsky <jhaberku@scylladb.com>
Message-Id: <5d22d964a7735696fb6bb7606ed88f35dde31413.1542731639.git.jhaberku@scylladb.com>
"
* seastar 70aecca...ac02df7 (5):
> Merge "Prefix preprocessor definitions" from Jesse
> cmake: Do not enable warnings transitively
> posix: prevent unused variable warning
> build: Adjust DPDK options to fix compilation
> io_scheduler: adjust property names
DEBUG, DEFAULT_ALLOCATOR, and HAVE_LZ4_COMPRESS_DEFAULT macro
references prefixed with SEASTAR_. Some may need to become
Scylla macros.
Operations on a append_challenged_posix_file_impl schedule asynchronous
operations when they are executed, which capture the file object. To
synchronize with them and prevent use-after-free, we need to call
close() before destroying the file.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
Message-Id: <20180217170556.27330-1-duarte@scylladb.com>
Use per CF-id reference count instead, and use handles as result of
add operations. These must either be explicitly released or stored
(rp_set), or they will release the corresponding replay_position
upon destruction.
Note: this does _not_ remove the replay positioning ordering requirement
for mutations. It just removes it as a means to track segment liveness.
Test should
a.) Wait for the flush semaphore
b.) Only compare segement sets between start and end, not start,
end and inbetwen. I.e. the test sort of assumed we started
with < 2 (or so) segments. Not always the case (timing)
Message-Id: <1496828317-14375-1-git-send-email-calle@scylladb.com>
The test assumed that mutations added to the commitlog are visible to
reads as soon as a new segment is opened. That's not true because
buffers are written back in the background, and new segment may be
active while the previous one is still being written or not yet
synced.
Fix the test so that it expectes that the number of mutations read
this way is <= the number of mutations read, and that after all
segments are synced, the number of mutations read is equal.
Message-Id: <1481630481-19395-1-git-send-email-tgrabiec@scylladb.com>
Fixes#1775
stream lacks a check "is_open", which is a bummer. We have to both
prevent exception propagation and add a flag of our own to make sure
exceptions in producer code reaches consumer, and does not simply
get lost in the reactor.
Message-Id: <1478508817-18854-1-git-send-email-calle@scylladb.com>
corrupt_segment() is meant to write some garbage at arbitrary position
in the commitlog segment. That position is not necessairly properly
aligned for uint32_t.
Silences ubsan complaints about unaligned write.
Signed-off-by: Paweł Dziepak <pdziepak@scylladb.com>
Message-Id: <1456827726-21288-1-git-send-email-pdziepak@scylladb.com>
We have an API that wraps open_file_dma which we use in some places, but in
many other places we call the reactor version directly.
This patch changes the latter to match the former. It will have the added benefit
of allowing us to make easier changes to these interfaces if needed.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <29296e4ec6f5e84361992028fe3f27adc569f139.1451950408.git.glauber@scylladb.com>
This cleanup patch got lost in git-space some time ago. It is however sorely
needed...
* Use cleaner wrapper for creating temp dir + commit log, avoiding
having to clear and clean in every test, etc.
* Remove assertions based on file system checks, since these are not
valid due to both the async nature of the CL, and more to the point,
because of pre-allocation of files and file blocks. Use CL
counters/methods instead
* Fix some race conditions to ensure tests are safe(r)
* Speed up some tests
Explicitly use up all the memory in the system as best as we can instead
Still not super reliable, but should have less side effects. And work better
with pre-allocated segment files
Fixes spurious failures in test_commitlog_discard_completed_segments
* Do explicit sync on all segments to prevent async flushed from keeping
segements alive.
* Use counter instead of actual file counting to avoid racing with
pre-allocation of segments
Refs #356
Pre-allocates N segments from timer task. N is "adaptive" in that it is
increased (to a max) every time segement acquisition is forced to allocate
a new instead of picking from pre-alloc (reserve) list. The idea is that it is
easier to adapt how many segments we consume per timer quanta than the timer
quanta itself.
Also does disk pressure check and flush from timer task now. Note that the
check is still only done max once every new segment.
Some logging cleanup/betterment also to make behaviour easier to trace.
Reserve segments start out at zero length, and are still deleted when finished.
This is because otherwise we'd still have to clear the file to be able to
properly parse it later (given that is can be a "half" file due to power fail
etc). This might need revisiting as well.
With this patch, there should be no case (except flush starvation) where
"add_mutation" actually waits for a (potentially) blocking op (disk).
Note that since the amount of reserve is increased as needed, there will
be occasional cases where a new segment is created in the alloc path
until the system finds equilebrium. But this should only be during a breif
warmup.
v2: Fixed timestamp not being reset on reserve acquire
Refs #356
Pre-allocates N segments from timer task. N is "adaptive" in that it is
increased (to a max) every time segement acquisition is forced to allocate
a new instead of picking from pre-alloc (reserve) list. The idea is that it is
easier to adapt how many segments we consume per timer quanta than the timer
quanta itself.
Also does disk pressure check and flush from timer task now. Note that the
check is still only done max once every new segment.
Some logging cleanup/betterment also to make behaviour easier to trace.
Reserve segments start out at zero length, and are still deleted when finished.
This is because otherwise we'd still have to clear the file to be able to
properly parse it later (given that is can be a "half" file due to power fail
etc). This might need revisiting as well.
With this patch, there should be no case (except flush starvation) where
"add_mutation" actually waits for a (potentially) blocking op (disk).
Note that since the amount of reserve is increased as needed, there will
be occasional cases where a new segment is created in the alloc path
until the system finds equilebrium. But this should only be during a breif
warmup.
Patch "Fix some timing/latency issues with sync" changed new_segment to
_not_ wait for flush to finish. This means that checking actual files on
disk in the test case might race.
Lucklily, we can more or less just check the segment list instead
(added recently-ish)
Also at seastar-dev: calle/commitlog_flush_v3
(And, yes, this time I _did_ update the remote!)
Refs #262
Commit of original series was done on stale version (v2) due to authors
inability to multitask and update git repos.
v3:
* Removed future<> return value from callbacks. I.e. flush callback is now
only fully syncronous over actual call
* Do not throw away commitlog segments on disk size overflow.
Issue a flush request (i.e. calculate RP we want to free unto,
and for all dirty CF:s, do a request).
"Abstracted" as registerable callback. I.e. DB:s responsibility
to actually do something with it.
* Fixes#247
* Re-introduce test_allocation_failure, but allow for the "failure" to not
happen. I.e. if run with low memory settings, the test will check that
allocation failure is graceful. With lots of memory it will check partial
write.
Origin
* Note: removed commitlog_test:test_allocation_failure because with
segments limited to 4GB -> mutation limited to 2GB, actually forcing
a fail is not guaranteed or even likely.
