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raft: add doc for storage

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This commit is contained in:
Xiang Li 2014-12-22 12:33:14 -08:00
parent d87ee9819b
commit 2dbdf87f86
1 changed files with 5 additions and 3 deletions
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8
raft/doc.go
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@ -19,8 +19,8 @@ Package raft provides an implementation of the raft consensus algorithm.
The primary object in raft is a Node. You either start a Node from scratch
using raft.StartNode or start a Node from some initial state using raft.RestartNode.
n := raft.StartNode(0x01, []int64{0x02, 0x03}, 3, 1)
storage := raft.NewMemoryStorage()
n := raft.StartNode(0x01, []int64{0x02, 0x03}, 3, 1, storage)
Now that you are holding onto a Node you have a few responsibilities:
@ -37,6 +37,8 @@ channel returned by n.Ready(). It is important that the user persist any
entries that require stable storage before sending messages to other peers to
ensure fault-tolerance.
An example MemoryStorage is provided in the raft package.
And finally you need to service timeouts with Tick(). Raft has two important
timeouts: heartbeat and the election timeout. However, internally to the raft
package time is represented by an abstract "tick". The user is responsible for
@ -50,7 +52,7 @@ The total state machine handling loop will look something like this:
case <-s.Ticker:
n.Tick()
case rd := <-s.Node.Ready():
saveToStable(rd.State, rd.Entries)
saveToStorage(rd.State, rd.Entries)
send(rd.Messages)
process(rd.CommittedEntries)
s.Node.Advance()