This commit includes functionality to turn on
the object serializer for network communication.
This is done the following way:
- On incoming connections, a process will detect
whether the client supports the object serializer
and will only serialize responses with it, if it does
- On outgoing connections, the command line flag is used
to determine whether the object serializer should be used
to send data.
This way, a cluster can run in mixed mode. To upgrade one
can upgrade one process at a time and set the flag one process
at a time.
This is how this is tested on the simulator:
- The command line flag can take three options: on, off,
and random.
- For off, the object serializer will never we used.
- For on, the object serializer will be always used.
- For random, the simulator will flip a coin for each
process it starts up.
This commit includes:
- The flatbuffers implementation
- A draft on how it should be used for network messages
- A serializer that can be used independently
What is missing:
- All root objects will need a file identifier
- Many special classes can not be serialized yet as the
corresponding traits are not yet implemented
- Object serialization can not yet be turned on (this will
need a network option)
This is the first part of making `TraceEvent` cheaper. The main idea is
to defer calls to any code that formats string. These are the main
changes:
- TraceEvent::detail now takes a c-string instead of std::string for
literals. This prevents unnecessary allocations if the trace is not
going to be printed in the first place (for example for SevDebug).
Before that `detail` expected a `std::string` as key, which mean that
any string literal would be copied on each call.
- Templates Traceable and SpecialTraceMetricType. These templates can be
specialized for any type that needs to be printed. The actual
formatting will be deferred to after the `enabled` check. This
provides two benefits: (1) if a TraceEvent is disabled, we don't pay
for the formatting and (2) TraceEvent can trace types that it doesn't
know about.
- TraceEvent::enabled will be set in the constructor if the Severity is
passed. This will make sure that `TraceEvent::init` is not called.
- `TraceEvent::detail` will be inlined. So for disabled TraceEvent
calls, a call to detail will only introduce a if-branch which is much
cheaper than a function call.
This change allows a user to write a workload in Java.
The way this is implemented is by creating a JVM within the
simulator and calling the corresponding workload class. A
workload can then run in the simulator or on a testing cluster.
If the workload is executed within the simulator, the resulting
test will not be deterministic anymore as it will execute in a
different thread (and even without that it is not clear, whether
we could get determinism as the JVM does a lot of stuff that are
not deterministic).
This is intendet to get better testing of the Java client and
layer authors can use the simulator to test their layers on a single
machine but they can still simulate failing machines etc.
- Some Linux filesystems don't support O_DIRECT which is required by
Kernel AIO to function properly. Instead of using O_SYNC, EIO is
much better options in terms of performance penalty.
- Some systems may not support AIO at all. Eg. Windows Subsystem for
Linux.
FIXES#842
RELATED #274
Add a new role for ratekeeper.
Remove StorageServerChanges from data distribution.
Ratekeeper monitors storage servers, which borrows the idea from
DataDistribution.
Change the rst document file;
Change the coding style to be consistent with the nearby code;
Ensure we always initilize the connectedCoordinatesNum to 0
even when the variable is not used.
In Linux, KAIO uses ASSERT to make sure open() flags have
OPEN_UNBUFFERED set.
In Windows, we uses if-condition and return io_errors() when the
flag is not set.
This PR makes Windoes implementation always use ASSERT to check the
flag.
Since keeping a union and using the packet size to figure out whether
the ConnectPacket is using IPv6 to IPv4 address is not easily
maintainable. For simplicity, we just serialize everything in
ConnectPacket and be backward compatible with older format.
However, some code for some much older stuff is removed.
- NetworkAddress now contains IPAddress object which can be either
IPv4 or IPv6 address. 128bits are used even for IPv4 addresses,
however only 32bits are used when using/serializing IPv4 address.
- ConnectPacket is updated to store IPv6 address. Backward compatible
with old format since the first 32bits of IP address field is used
for serialization of IPv4.
- Mainly updates rest of the code to use IPAddress structure instead
of plain uint32_t.
- IPv6 address/pair ports should be represented as `[ip]:port` as per
convention. This applies to both cluster files and command line
arguments.
To understand if all clients have configured TLS,
we check the tlsoption when a client tries to open database.
This is similar to how we track the versions of multi-version clients.
* log_version in the database (`/conf/log_version`) is now a hint that gets
rounded to the nearest supported version.
* fdbcli and FDB enforce that only a valid log_version can be configured to
* TLogVersion is persisted in CoreTLogSet (and LogSet and TLogSet)
* Some comments here and there
* Add an assert on filename length to make sure KV-pairs in filename
don't exceed a maximum length.
Let cluster controller to start a new data distributor role by sending a
message to a chosen worker.
Change MasterInterface usage in DataDistribution to masterId
Add DataDistributor rejoin handling.
This allows the data distributor to tell the new cluster controller of its
existence so that the controller doesn't spawn a new one. I.e., there should
be only ONE data distributor in the cluster.
If DataDistributor (DD) doesn't join in a while, then ClusterController (CC) tries
to recruit one as DD. CC also monitors DD and restarts one if it failed.
The Proxy is also monitoring the DD. If DD failed, the Proxy will ask CC for
the new DD.
Add GetRecoveryInfo RPC to master server, which is called by data distributor
to obtain the recovery Transaction version from the master server.
Fixed a couple of bugs
1) A rare race condition where a worker is being roles even after it died.
2) Fix how RoleFitness is calculated for TLog and LogRouter. Only worst fitness is compared to see if a better fit is available.
There are several missing includes for cmath in the code, I added those.
Next, Coro returns a reference to a stack variable and this causes a
warning. As this is probably ok for Coro, I disabled the warning in
that file for GCC. I want to have this warning in the build system as
it is generally a very useful warning to have.
Another change is that major and minor are deprecated for a while now.
I replaced those with gnu_dev_major and gnu_dev_minor.
ErrorOr currently implements operators ==, !=, and <. These do not
compile because Error does not implement ==. This compiles on older
versions of gcc and clang because ErrorOr<T>::operator== is not used
anywhere. It is still wrong though and newer gcc versions complain.
I simply removed these methods.
The most interesting fix is that TraceEvent::~TraceEvent is currently
throwing exceptions. This is illegal behavior in C++11 and a idea in
older versions of C++. For now I simply removed the throw, but this
might need some more thought.
The simulator uses a hash table to cache all open files to make sure
that several simulated processes don't open the file more than once.
This currently doesn't work properly and deleted files are often kept
open forever. As a result, we often ran out of file descriptors.
The problem is luckily quite simple: files are often opened with an
absolute path but later a relativ path is passed for deletion. This
is not working because the map that is used to store the file
descriptors is not aware of paths - so deleted files are often not
removed from this map. The fix that works for us is to just always
work with absolute paths when adding and removing files from this map.
Sim2Listener can now take the network address to listen on. This is
used to listen to multiple ports in simulator and test the patch
which added multiple network addresses to single endpoint.
- This patch will make FDB listen to multiple addresses given via
command line. Although, we'll still use first address in most places,
this patch starts using vector<NetworkAddress> in Endpoint at some basic
places.
- When sending packets to an endpoint, pick a random network address in
endpoints
- Renames Endpoint::address to Endpoint::addresses since it
now holds a vector of addresses.
Extend `Endpoint` class to take multiple NetworkAddresses instead of
just one. Hence, to talk to an endpoint instead of one IP:PORT, we'll
have multiple IP:PORT pairs.
This patch simply adds the field and makes changes to compile the
codebase. The first element of of `address` field is used everywhere.
Hence the way we talk to remains same with this patch.
NOTE:
Directly accessing the first memeber of Endpoint::address is unsafe
as Endpoint() doesn't enforces non-empty address list. However, since
the correctness test pass for now and are anyway replacing all those
unsafe accesses with ones considering the whole vector, this patch
ignores to access them in safe way.
Resolve code review comments:
1) Improve the code efficiency by avoiding unnecessary map search
and avoiding unnecessary checking
2) Remove or comment out trace events when they can be spammy
3) Improve coding style
Tested for 1 hour and no error was found.
KillRegionCycle.txt test was excluded from the test because
existing code cannot pass that test either
Signed-off-by: Meng Xu <meng_xu@apple.com>
Current server team collection logic does not consider
the fact that multipe storage servers can run on the same machine.
When multiple machines fail, all servers on the machines will fail, and
the possibility of having one process team fail and lose data is very high.
To reduce the possibility of losing data when multiple machine fails,
we first create machine teams which span across different fault zones;
we then create server teams based on machine teams by
first picking 1 machine team, and then
picking 1 server from each machine in the machine team.
Signed-off-by: Meng Xu <meng_xu@apple.com>
allAlternatives failed logic was simplified, because we are already doing a global rate limiting, so a per shard limit is unnecessary
reduced unnecessary state variables in waitMetrics requests
Remove the use of relative paths. A header at foo/bar.h could be included by
files under foo/ with "bar.h", but would be included everywhere else as
"foo/bar.h". Adjust so that every include references such a header with the
latter form.
Signed-off-by: Robert Escriva <rescriva@dropbox.com>
fix: we cannot pop the txs tag from remote logs until they have a full copy of the txnStateStore
fix: we have to modify all of history, we cannot stop after finding a local remote
Which contains:
* Improve TLS cert refresh logging.
* Loading a mismatching cert shouldn't prevent TLS connections.
* Initialize the cached copy of ca/cert/key data.
* Open certificates as uncached, which means they can be write-protected.
This fixes the windows build. For some reason, MSVC believes that the
actor-compiled version of networkSender actually exists, but the
non-actor-compiled version doesn't exist.
This is a hackish workaround, as the largest reason to not include a
.g.h file is because it defines a POST_ACTOR_COMPILER define that messes
with actorcompiler.h's #defines. We can just undefine that after
including the file. ...but carefully.
This was just purely an accidental oversight from before. The variables
were there and handled like they were actually initilized with the
contents of the various certificate files at start-up, but never
actually were.
And add a few trace events to make it easy to see when the system
noticed and tried to reload certificate data.
There's never any reason to save the value of a Void return, and it's
the easiest source of redefined variable bugs that will creep back in
over time. So just `wait(...)`, it's cleaner that way.
For files that required flow.h, and only got it through actorcompiler.h,
their version of flow.h would have the actorcompiler #defines defined.
Then, if it included a STL/boost file, the same breakage would result.
This needs to not happen, so the include of flow.h in actorcompiler.h
was removed.
This introduces a new rule in our codebase, that any file that #includes
actorcompiler.h needs to do it as the last #include, and it needs to
then #include unactorcompiler.h at the end of the file.
The point of this is that it prevents our actorcompiler.h #defines from
leaking into boost or the c++ standard library. Both of these start
throwing errors if you s/state// their code, which `#define state `
effectively does.
This takes advantage of the new actorcompiler functionality to avoid
having duplicate definitions of `Void _` when trying to feed the
un-actorompiled source through clang.
Vishesh Yadav