The previous fix removed the additional insertion of "min rp" per source
shard based on whether we had processed existing CF:s or not (i.e. if
a CF does not exist as sstable at all, we must tag it as zero-rp, and
make whole shard for it start at same zero.
This is bad in itself, because it can cause data loss. It does not cause
crashing however. But it did uncover another, old old lingering bug,
namely the commitlog reader initiating its stream wrongly when reading
from an actual offset (i.e. not processing the whole file).
We opened the file stream from the file offset, then tried
to read the file header and magic number from there -> boom, error.
Also, rp-to-file mapping was potentially suboptimal due to using
bucket iterator instead of actual range.
I.e. three fixes:
* Reinstate min position guarding for unencoutered CF:s
* Fix stream creating in CL reader
* Fix segment map iterator use.
v2:
* Fix typo
Message-Id: <1490611637-12220-1-git-send-email-calle@scylladb.com>
Fixes#2173
Per-shard min positions can be unset if we never collected any
sstable/truncation info for it, yet replay segments of that id.
Wrap the lookups to handle "missing data -> default", which should have been
there in the first place.
Message-Id: <1490185101-12482-1-git-send-email-calle@scylladb.com>
Fixes#2098
Replay previously did all segments in parallel on shard 0, which
caused heavy memory load. To reduce this and spread footprint
across shards, instead do X segments per shard, sequential per shard.
v2:
* Fixed whitespace errors
Message-Id: <1489503382-830-1-git-send-email-calle@scylladb.com>
It is safe to copy column_mapping accros shards. Such guarantee comes at
the cost of performance.
This patch makes commitlog_entry_writer use IDL generated writer to
serialise commitlog_entry so that column_mapping is not copied. This
also simplifies commitlog_entry itself.
Performance difference tested with:
perf_simple_query -c4 --write --duration 60
(medians)
before after diff
write 79434.35 89247.54 +12.3%
Do not ignore a future<> retuned by cycle() since it will produce a
warning in case of an error. Log it instead.
Message-Id: <20170219151811.GN11471@scylladb.com>
On database stop, we do flush memtables and clean up commit log segment usage.
However, since we never actually destroy the distributed<database>, we
don't actually free the commitlog either, and thus never clear out
the remaining (clean) segments. Thus we leave perfectly clean segments
on disk.
This just adds a "release" method to commitlog, and calls it from
database::stop, after flushing CF:s.
Message-Id: <1485784950-17387-1-git-send-email-calle@scylladb.com>
Refs #1813 (fixes scylla part)
Added require_client_auth and priority_string options to
server_encryption_options/client_encryption_options an process them.
Allows TLS method/algo specification. Also enabled enforcing known cert
authentication for both node-to-node and client communication.
* seastar 397685c...c1dbd89 (13):
> lowres_clock: drop cache-line alignment for _timer
> net/packet: add missing include
> Merge "Adding histogram and description support" from Amnon
> reactor: Fix the error: cannot bind 'std::unique_ptr' lvalue to 'std::unique_ptr&&'
> Set the option '--server' of tests/tcp_sctp_client to be required
> core/memory: Remove superfluous assignment
> core/memory: Remove dead code
> core/reactor: Use logger instead of cerr
> fix inverted logic in overprovision parameter
> rpc: fix timeout checking condition
> rpc: use lowres_clock instead of high resolution one
> semaphore: make semaphore's clock configurable
> rpc: detect timedout outgoing packets earlier
Includes treewide change to accomodate rpc changing its timeout clock
to lowres_clock.
Includes fixup from Amnon:
collectd api should use the metrics getters
As part of a preperation of the change in the metrics layer, this change
the way the collectd api uses the metrics value to use the getters
instead of calling the member directly.
This will be important when the internal implementation will changed
from union to variant.
Signed-off-by: Amnon Heiman <amnon@scylladb.com>
Message-Id: <1485457657-17634-1-git-send-email-amnon@scylladb.com>
The per-node limit will be total memory divided by number of shards
instead of just total memory. For example, when Scylla is started with
-c16 -m16G, the commit log will induce flushes on given shard when
unflushed data exceeds on that shard 62MB instead of 1GB.
Fixes#2046.
Message-Id: <1485874534-10939-1-git-send-email-tgrabiec@scylladb.com>
column_mapping is not safe to access across shards, because data_type
is not safe to access. One of the manifestation of this is that
abstract_type::is_value_compatible_with() always fails if the two
types belong to different shards.
During replay, column_mapping lives on the replaying shard, and is
used by converting_mutation_partition_applier against the schema on
the target shard. Since types in the mapping will be considered
incompatible with types in the schema, all cells will be dropped.
Fix by using column_mapping in a safe way, by copying it to the target
shard if necessary. Each shard maintains its own cache of column
mappings.
Fixes#1924.
Message-Id: <1481310463-13868-1-git-send-email-tgrabiec@scylladb.com>
The semaphore future may be unavailable for many reasons. Specifically,
if the task quota is depleted right between sem.wait() and the .then()
clause in get_units() the resulting future won't be available.
That is particularly visible if we decrease the task quota, since those
events will be more frequent: we can in those cases clearly see this
counter going up, even though there aren't more requests pending than
usual.
This patch improves the situation by replacing that check. We now verify
whether or not there are waiters in the semaphore.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <113c0d6b43cd6653ce972541baf6920e5765546b.1481222621.git.glauber@scylladb.com>
The problem is that replay will unlink any segments which were on disk
at the time the replay starts. However, some of those segments may
have been created by current node since the boot. If a segment is part
of reserve for example, it will be unlinked by replay, but we will
still use that segment to log mutations. Those mutations will not be
visible to replay after a crash though.
The fix is to record preexisting segents before any new segments will
have a chance to be created and use that as the replay list.
Introduced in abe7358767.
dtest failure:
commitlog_test.py:TestCommitLog.test_commitlog_replay_on_startup
Message-Id: <1481117436-6243-1-git-send-email-tgrabiec@scylladb.com>
When requests hit the commitlog, each of them will be assigned a replay
position, which we expect to be ordered. If reorders happen, the request
will be discarded and re-applied. Although this is supposed to be rare,
it does increase our latencies, specially when big requests are
involved. Processing big requests is expensive and if we have to do it
twice that adds to the cost.
The commitlog is supposed to issue replay positions in order, and it
coudl be that the code that adds them to the memtables will reorder
them. However, there is one instance in which the commitlog will not
keep its side of the bargain.
That happens when the reserve is exhausted, and we are allocating a
segment directly at the same time the reserve is being replenished. The
following sequence of events with its deferring points will ilustrate
it:
on_timer:
return this->allocate_segment(false). // defer here // then([this](sseg_ptr s) {
At this point, the segment id is already allocated.
new_segment():
if (_reserve_segments.empty()) {
[ ... ]
return allocate_segment(true).then ...
At this point, we have a new segment that has an id that is higher than
the previous id allocated.
Then we resume the execution from the deferring point in on_timer():
i = _reserve_segments.emplace(i, std::move(s));
The next time we need to allocate a segment, we'll pick it from the
reserve. But the segment in the reserve has an id that is lower than the
id that we have already used.
Reorders are bad, but this one is particularly bad: because the reorder
happens with the segment id side of the replay position, that means that
every request that falls into that segment will have to be reinserted.
This bug can be a bit tricky to reproduce. To make it more common, we
can artificially add a sleep() fiber after the allocate_segment(false)
in on_timer(). If we do that, we'll see a sea of reinsertions going on
in the logs (if dblog is set to debug).
Applying this patch (keeping the sleep) will make them all disappear.
We do this by rewriting the reserve logic, so that the segments always
come from the reserve. If we draw from a single pool all the time, there
is no chance of reordering happening. To make that more amenable, we'll
have the reserve filler always running in the background and take it out
of the timer code.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <49eb7edfcafaef7f1fdceb270639a9a8b50cfce7.1480531446.git.glauber@scylladb.com>
This reverts commit 0e9b75d406.
commitlog_test fails with this:
Running 14 test cases...
ERROR 2016-11-28 20:48:00,565 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:00,578 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:10,591 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:20,601 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
tests/commitlog_test.cc(203): fatal error in "test_commitlog_discard_completed_segments": critical check dn <= nn failed
ERROR 2016-11-28 20:48:20,645 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:20,837 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
WARN 2016-11-28 20:48:20,838 [shard 0] commitlog - Exception in segment reservation: std::system_error (error system:2, No such file or directory)
ERROR 2016-11-28 20:48:20,952 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:31,064 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:31,083 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:31,098 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:31,111 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
ERROR 2016-11-28 20:48:31,113 [shard 0] commitlog - Segment reserve is full! Ignoring and trying to continue, but shouldn't happen
WARN 2016-11-28 20:48:31,116 [shard 0] commitlog - Could not allocate 16388 k bytes output buffer (16388 k required)
*** 1 failure detected in test suite "tests/commitlog_test.cc"
WARN 2016-11-28 20:48:31,117 [shard 0] commitlog - Exception in segment reservation: std::system_error (error system:2, No such file or directory)
When requests hit the commitlog, each of them will be assigned a replay
position, which we expect to be ordered. If reorders happen, the request
will be discarded and re-applied. Although this is supposed to be rare,
it does increase our latencies, specially when big requests are
involved. Processing big requests is expensive and if we have to do it
twice that adds to the cost.
The commitlog is supposed to issue replay positions in order, and it
coudl be that the code that adds them to the memtables will reorder
them. However, there is one instance in which the commitlog will not
keep its side of the bargain.
That happens when the reserve is exhausted, and we are allocating a
segment directly at the same time the reserve is being replenished. The
following sequence of events with its deferring points will ilustrate
it:
on_timer:
return this->allocate_segment(false). // defer here // then([this](sseg_ptr s) {
At this point, the segment id is already allocated.
new_segment():
if (_reserve_segments.empty()) {
[ ... ]
return allocate_segment(true).then ...
At this point, we have a new segment that has an id that is higher than
the previous id allocated.
Then we resume the execution from the deferring point in on_timer():
i = _reserve_segments.emplace(i, std::move(s));
The next time we need to allocate a segment, we'll pick it from the
reserve. But the segment in the reserve has an id that is lower than the
id that we have already used.
Reorders are bad, but this one is particularly bad: because the reorder
happens with the segment id side of the replay position, that means that
every request that falls into that segment will have to be reinserted.
This bug can be a bit tricky to reproduce. To make it more common, we
can artificially add a sleep() fiber after the allocate_segment(false)
in on_timer(). If we do that, we'll see a sea of reinsertions going on
in the logs (if dblog is set to debug).
Applying this patch (keeping the sleep) will make them all disappear.
We do this by rewriting the reserve logic, so that the segments always
come from the reserve. If we draw from a single pool all the time, there
is no chance of reordering happening. To make that more amenable, we'll
have the reserve filler always running in the background and take it out
of the timer code.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <2606b97df39997bcf3af84a23adf17e094ffb0b8.1480107174.git.glauber@scylladb.com>
Recently we have changed our shutdown strategy to wait for the
_request_controller semaphore to make sure no other allocations are
in-flight. That was done to fix an actual issue.
The problem is that this wasn't done early enough. We acquire the
semaphore after we have already marked ourselves as _shutdown and
released the timer.
That means that if there is an allocation in flight that needs to use a
new segment, it will never finish - and we'll therefore neve acquire
the semaphore.
Fix it by acquiring it first. At this point the allocations will all be
done and gone, and then we can shutdown everything else.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <5c2a2f20e3832b6ea37d6541897519a9307294ed.1479765782.git.glauber@scylladb.com>
Aside from putting the requests in the commitlog class, read ahead
will help us going through the file faster.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Right now replay is being issued with the standard seastar priority.
The rationale for that at the time is that it is an early event that
doesn't really share the disk with anybody.
That is largely untrue now that we start compactions on boot.
Compactions may fight for bandwidth with the commitlog, and with such
low priority the commitlog is guaranteed to lose.
Fixes#1856
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Replay file is opened, so it should be closed. We're not seeing any
problems arising from this, but they may happen. Enabling read ahead in
this stream makes them happen immediately. Fix it.
Signed-off-by: Glauber Costa <glauber@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>
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>
By default, io checker will cause Scylla to shutdown if it finds
specific system errors. Right now, io checker isn't flexible
enough to allow a specialized handler. For example, we don't want
to Scylla to shutdown if there's an permission problem when
uploading new files from upload dir. This desired flexibility is
made possible here by allowing a handler parameter to io check
functions and also changing existing code to take advantage of it.
That's a step towards fixing #1709.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
We calculate two sizes during the allocation: "size", which is the
in-segment size of this mutation, and "s", which is that plus the
overhead. cycle() must be called with the latter, not the former, as
doing otherwise may lead to buffer overflows.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <ccf346d8d0ebb44a1ba9fd069653bab0d7be0a61.1477063157.git.glauber@scylladb.com>
Current tracker for pending allocations is a queue_size GAUGE. Add a
total_operations version so we have more insight on what's going on.
It will be called requests_blocked_memory for consistency with other
subsystems that track similar things.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
The current incarnation of commitlog establishes a maximum amount of
writes that can be in-flight, and blocks new requests after that limit
is reached.
That is obviously something we must do, but the current approach to it
is problematic for two main reasons:
1) It forces the requests that trigger a write to wait on the current
write to finish. That is excessive; ideally we would wait for one
particular write to finish, not necessarily the current one. That
is made worse by the fact that when a write is followed by a flush
(happens when we move to a new segment), then we must wait for
*all* writes in that segment to finish.
1) it casts concurrency in terms of writes instead of memory, which
makes the aforementioned problem a lot worse: if we have very big
buffers in flight and we must wait for them to finish, that can
take a long time, often in the order of seconds, causing timeouts.
The approach taken by this patch is to replace the _write_semaphore
with a request_controller. This data structure will account the amount
of memory used by the buffers and set a limit on it. New allocations
will be held until we go below that limit, and will be released
as soon as this happens.
This guarantees that the latencies introduced by this mechanism are
spread out a lot better among requests and will keep higher percentile
latencies in check.
To test this, I have ran a workload that times out frequently. That
workload use 10 threads to write 100 partitions (to isolate from the
effects of the memtable introduced latencies) in a loop and each
partition is 2MB in size.
After 10 minutes running this load, we are left with the following
percentiles:
latency mean : 51.9 [WRITE:51.9]
latency median : 9.8 [WRITE:9.8]
latency 95th percentile : 125.6 [WRITE:125.6]
latency 99th percentile : 1184.0 [WRITE:1184.0]
latency 99.9th percentile : 1991.2 [WRITE:1991.2]
latency max : 2338.2 [WRITE:2338.2]
After this patch:
latency mean : 54.9 [WRITE:54.9]
latency median : 43.5 [WRITE:43.5]
latency 95th percentile : 126.9 [WRITE:126.9]
latency 99th percentile : 253.9 [WRITE:253.9]
latency 99.9th percentile : 364.6 [WRITE:364.6]
latency max : 471.4 [WRITE:471.4]
Signed-off-by: Glauber Costa <glauber@scylladb.com>
In a subsequent patch, I'll use this code in a different place. To
prepare for that, we move it out as a method. It also fits a lot better
inside the segment manager, so move it there.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
Goal is to calculate a size that is lesser or equal than the
segment-dependent size.
This was originally written by Tomasz, and featured in his submission
"commitlog: Handle overload more gracefully"
Extracted here so it sits clearly in a different patch.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
It is mostly an optimization, and while it makes sense in this context,
it won't soon as we'll stop waiting for the current cycle specifically
to finish.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
We'll do that so we can, in following patches, use static members from
the segment. Those are not defined at this point.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
We track the amount of pending allocations but we don't really export
it. It will be crucial when we stop tracking pending writes.
This patch exports it through a method instead of the totals structure,
so we can easily change it. Current code probing pending_allocations
(the api code) is also converted to use the public method instead of the
totals struct.
Signed-off-by: Glauber Costa <glauber@scylladb.com>
* seastar 2b55789...5b7252d (3):
> Merge "rpc: serialize large messages into fragmented memory" from Gleb
> Merge "Print backtrace on SIGSEGV and SIGABRT" from Tomasz
> test_runner: avoid nested optionals
Includes patch from Gleb to adapt to seastar changes.
The fact that Seastar's semaphore has a default initializer of 1 if not
explicitly initialized is confusing and unexpected and recently lead to
two bugs. So ScyllaDB should not rely on this default behavior, and specify
the initial value of each semaphore explicitly.
In several cases in the ScyllaDB code, the explict initialization was
missing, and this patch adds it. In one case (rate_limiter) I even think
the default of 1 was a bit strange, and 0 makes more sense.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <1474530745-23951-1-git-send-email-nyh@scylladb.com>
Fixes: #1490
While periodic mode is a all-bets-off crap-shoot as far as knowing if
data actually reached disk or not, batch mode is supposed to be
somewhat more reliable/deterministic.
Thus, if we get an exception writing/flushing the current buffer,
we should propagate exceptions to all execution paths involved
in this buffer.
Thus, adding a muation to commit log in batch, will now, if an error
is generated, result in an exception to the caller, which should be
interpreted as "data might not have been persisted".
The failing segment is then closed, and we happily hope things will
get better in the next. Which they probably wont.
Missing: registration of some sort of "error-handling policy", similar
to origin, which can either kill transports or shut down process.
(A reasonable guess is that disk errors in commit log are not gonna
be recoverable).
Continuation reordering could cause us to repeatedly see the
segment-local flag var even though actual write/sync ops are done.
Can cause wild recursion without actual delayed continuation ->
SOE.
Fix by also checking queue status, since this is the wait object.
sstable_list is now a map<generation, sstable>; change it to a set
in preparation for replacing it with sstable_set. The change simplifies
a lot of code; the only casualty is the code that computes the highest
generation number.
If a CF does not have any sstables at all, we should treat it
as having a replay position of zero. However, since we also
must deal with potential re-sharding, we cannot just set
shard->uuid->zero initially, because we don't know what shards
existed.
Go through all CF:s post map-reduce, and for every shard where
a CF does not have an RP-mapping (no sstables found), set the
global min pos (for shard) to zero.
Fixes#1372
Message-Id: <1465991864-4211-1-git-send-email-calle@scylladb.com>
Using an ordering mechanism better than rw-locks for write/flush
means we can wait for pending write in batch mode, and coalesce
data from more than one mutation into a chunk.
It also means we can wait for a specific read+flush pair (based on
file position).
Downside is that we will not do parallel writes in batch mode (unless
we run out of buffer), which might underutilize the disk bandwidth.
Upside is that running in batch mode (i.e. per-write consistency)
now has way better bandwidth, and also, at least with high mutation
rate, better average latency.
Message-Id: <1465990064-2258-1-git-send-email-calle@scylladb.com>
With big rows I see contention in XFS allocations which cause reactor
thread to sleep. Commitlog is a main offender, so enlarge extent to
commitlog segment size for big files (commitlog and sstable Data files).
Message-Id: <20160404110952.GP20957@scylladb.com>
