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raft: hide Campaign rules on applying all entries

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Xiang Li
2016-07-25 15:06:57 -07:00
parent ec5c5d9ddf
commit 484f579905
5 changed files with 60 additions and 37 deletions
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16
raft/node.go
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@@ -136,21 +136,7 @@ type Node interface {
// However, as an optimization, the application may call Advance while it is applying the
// commands. For example. when the last Ready contains a snapshot, the application might take
// a long time to apply the snapshot data. To continue receiving Ready without blocking raft
// progress, it can call Advance before finishing applying the last ready. To make this optimization
// work safely, when the application receives a Ready with softState.RaftState equal to Candidate
// it MUST apply all pending configuration changes if there is any.
//
// Here is a simple solution that waiting for ALL pending entries to get applied.
// ```
// ...
// rd := <-n.Ready()
// go apply(rd.CommittedEntries) // optimization to apply asynchronously in FIFO order.
// if rd.SoftState.RaftState == StateCandidate {
// waitAllApplied()
// }
// n.Advance()
// ...
//```
// progress, it can call Advance before finishing applying the last ready.
Advance()
// ApplyConfChange applies config change to the local node.
// Returns an opaque ConfState protobuf which must be recorded