The first entry in the log is a dummy which is used for matchTerm
but may not have an actual payload. This change permits Storage
implementations to treat this term value specially instead of
storing it as a dummy Entry.
Storage.FirstIndex() no longer includes the term-only entry.
This reverses a recent decision to create entry zero as initially
unstable; Storage implementations are now required to make
Term(0) == 0 and the first unstable entry is now index 1.
stableTo(0) is no longer allowed.
* coreos/master: (27 commits)
pkg/wait: move wait to pkg/wait
etcdserver: do not add/remove/update local member to/from sender hub
etcdserver: not record attributes when add member
raft: add a test for proposeConfChange
raft: block Stop() on n.done, support idempotency
raft: add a test for node proposal
integration: add increase cluster size test
integration: remove unnecessary t.Testing argument
raft: stop the node synchronously
integration: fix test to propagate NewServer errors
etcdserver: move peer URLs check to config
etcdserver: ensure initial-advertise-peer-urls match initial-cluster
raft: add a test for node.Tick
raft: add comment string for TestNodeStart
etcdserver: use member instead of node at etcd level
raft: nodes return sorted ids
raft: update unstable when calling stableTo with 0
*: support updating advertise-peer-url Users might want to update the peerurl of the etcd member in several cases. For example, if the IP address of the physical machine etcd running on is changed, user need to update the adversite-pee-rurl accordingly. This commit makes etcd support updating the advertise-peer-url of its members.
transport: create a tls listener only if the tlsInfo is not empty and the scheme is HTTPS
etcdserver: use member pointer for all tests
...
Conflicts:
etcdserver/server.go
raft/log.go
raft/log_test.go
raft/node.go
Callers must in general have a reference to their Storage objects to
transfer entries from Ready to Storage, so it doesn't make sense to
create a hidden Storage for them.
By explicitly creating Storage objects in tests we can remove a
few casts of raftLog's storage field.
This change splits the raftLog.entries array into an in-memory
"unstable" list and a pluggable interface for retrieving entries that
have been persisted to disk. An in-memory implementation of this
interface is provided which behaves the same as the old version;
in a future commit etcdserver could replace the MemoryStorage with
one backed by the WAL.
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.
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 prevents the bug like this:
1. a node sends join to a cluster and succeeds
2. it starts with empty peers and waits for sync, but it have not
received anything
3. election timeout passes, and it promotes itself to leader
4. it commits some log entry
5. its log conflicts with the cluster's
Configure is used to propose config change. AddNode and RemoveNode is
used to apply cluster change to raft state machine. They are the
basics for dynamic configuration.
