Before this commit, compact always compact log at current appliedindex of raft.
This prevents us from doing non-blocking snapshot since we have to make snapshot
and compact atomically. To prepare for non-blocking snapshot, this commit make
compact supports index and nodes parameters. After completing snapshot, the applier
should call compact with the snapshot index and the nodes at snapshot index to do
a compaction at snapsohot index.
This adds a StartIndex field to the Watcher interface, which represents
the Etcd-Index at which the Watcher is created.
Also refactors the HTTP tests to use a table for most handleWatch tests
The usage of removed:
1. tell removed node about its removal explicitly using msgDenied
2. prevent removed node disrupt cluster progress by launching leader election
It is set when apply node removal, or receive msgDenied.
This introduces two new concepts: the cluster and the member.
Members are logical etcd instances that have a name, raft ID, and a list
of peer and client addresses.
A cluster is made up of a list of members.
golang's concept of "zero" time does not align with the zero value of
a unix timestamp. Initializing time.Time with a unix timestamp of 0
makes time.Time.IsZero fail. Solve this by initializing time.Time only
if we care about the time.
This is to fix possible testing failures caused by sync tests.
Changes:
1. Get rid of time sleep operations, which introduces uncertainty.
2. Use fake Store.
This changes etcdserver.Server to an interface, with the former Server
(now "EtcdServer") becoming the canonical/production implementation.
This will facilitate better testing of the http server et al with mock
implementations of the interface.
It also more clearly defines the boundary for users of the Server.
Yicheng Qin