Under highly conncurrent write load, the coordinating node would
create a connection to any other node that is part of the replica
group. Since each connection can be expensive, OOM sitations could
occur because there was no bounds on the number of new connections
that would be created. If writes on a remote node were slow, connections
could pile up an exacerbate the problem.
This switches the pool to be bounded and has a checkout that is blocking
with a timeout. If a connection is available, it's returned immediately.
If the pool still has room for more connections, it will create one if needed.
Otherwise, the call will block until a connection becomes available or
the timeout expires. In the case of a timeout, it is propogated back up
to the PointsWriter that determine what do return to the client.
Go style -- and existing runtime stats -- do not use underscores, but
instead use camel case. This change makes the internal stats adhere to
that convention.
Since INTO queries need to have absolute information about the database
to work, we need to create a loopback interface back to the cluster
in order to perform them.
Immediately return once the required number of writes are completed,
otherwise requests running with relaxed consistency levels (e.g. any
or one) would be blocked unexpectedly, for instance, waiting for dead
nodes to respond.
This commit converts meta.ShardInfo.OwnerIDs from a slice of ids
to a slice of objects. This is to support adding statuses for a
shard for a given node. For example, a node may have a shard
assigned to it but it is currently copying the shard and is not
ready to serve data for it.
The old `OwnerIDs` is marked as deprecated, however, the code
still supports loading from older protobuf-encoded data.
Jason Wilder
Paul Dix
Cory LaNou
Nathaniel Cook
Philip O'Toole
Charles Chan
Daniel Morsing
Mint
Jason Wilder
Takayuki Usui
Ben Johnson
Joseph Crail
David Norton
Philip O'Toole