When a process joins a cluster it fetches the cluster
interface. However, not the whole interface is exposed
to the client. This mechanism relies on the fact that
the serializer keeps the field ordering and doesn't
verify the message before parsing it.
To make this work, we provide a client type with one
member (the ClusterInterface which is exposed to the
client and the server). This client interface has the
same FileIdentifier as the ClusterControllerFullInterface
which has the same first member. This works because
FlatBuffers allows for members to be missing.
A client will always try to connect all coordinators.
This commit let Status track the number of connected coordinators
for each client.
This allows us to do canary in coordinators. For example,
when we switch from non-TLS to TLS, we can switch 1 coordinator
from non-TLS to TLS. This can help check if a client has the ability
to connect through TLS.
We can make the non-TLS to TLS switch for each coordinators
one by one. This avoid the risk of losing connection in the switch.
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.
fix: the cluster controller attempts to do a commit to determine if the cluster is alive, since its own internal recoveryState might not be up-to-date.
fix: forceMasterFailure on the cluster controller did not always cause the current master to be re-recruited
- 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.
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>
A.J. Beamon