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.
Since we set up the aggregate queries so that iterator is ordered,
we only need to look at the first value. This cuts about 10 seconds
off a large single series query running first.
Running show measurements in a partially replicated cluster produces inconsistent
results due to the connection pooling. When running remote meta-data queries,
the cluster service ends ups keeping map shard request open but still checks the connection
back into the pool. This causes inconsistent results because data from the last request
interferes with the new request.
This removes the connection pool which fixes the issue. It also has the side effect of fixing
a nodes pool connections that have gone bad when a node restarts. For example, in a 3 node cluster
that has been responding to queries correctly, restarting 1 node will cause all the other to fail
to query that node indefinitely. This is now fixed as well.
Some nodes may receive requests for shards that they are assigned but
do not have the shards locally yet. Just return no results in this case
instead of panicing.
The TSDBStore was returning a nil mapper if the shard did not exist. The caller always
assumed the mapper would not be nil causing a panic. Instead, have the mapper skip the mapping
phase if it's shard reference is nil. This fixes queries against data-only nodes and against
shards that are not fully replicated in the cluster.
Fixes#3574
Philip O'Toole
Philip O'Toole
Jason Wilder
Takayuki Usui
Ben Johnson
Paul Dix
Daniel Morsing
Nick Robinson