Modified the gossip implementation to optionally send messages directly (instead of over gossip).
Added support for local and remote NodeState, as well as function to merge remote into local state.
Refactored Protobuf models to include `DBMeta` and `FrameMeta` as well as support for NodeState.
Changes Gossiper to NodeSet.
Adds StaticNodeSet (for testing) and GossipNodeSet (for memberlist) implementations.
Changes NodeSet interface to return a pilosa-specific generic instead of `NodeSet interface`.
Removes NumMembers from interface (which is specific to memberlist).
Implements a Messenger interface with which to send inter-node messages via NodeSet.
The Pilosa implementation occurs in the GossipNodeSet.
Implements the Messenger as an object on Server, Handler, and Index.
Uses HealthStatus constants.
Removes commented-out code.
for gossip, make sure to bind to both host and port, and advertise those as well
adjust messenger to work with the db schema logic
add dependencies: hashicorp/memberlist, golang.org/x/sync
add dependency: golang.org/x/net
Uses `errgroup` to handle errors from broadcast messages.
Marshals message one time instead of once for every node.
Adds error handling for some errors that were being swallowed.
this affects the scanner/parser and makes it produce signed ints rather than
uints, and so it affects all code that is expecting unsighed ints to come out of
the parser.
Previously the cache type (`lru` or `ranked`) was determined by
checking the ending suffix of the frame. If it ended with a `.n`
then it was ranked. Otherwise it was an LRU.
This commit changes frames so that a `cacheType` option can be
passed in during creation to set either `lru` or `ranked`.
This commit changes the executor to select a bitmap from the
standard view or the inverse view based on whether the row label
or column label is specified.
