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raft: Elaborate a little more about committed entries in commitReady.

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This commit is contained in:
Ben Darnell
2015-03-17 13:22:36 -04:00
parent 271d911c32
commit cd1ff78ff3
1 changed files with 9 additions and 6 deletions
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15
raft/multinode.go
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@@ -144,12 +144,15 @@ func (g *groupState) commitReady(rd Ready) {
g.prevHardSt = rd.HardState
}
if g.prevHardSt.Commit != 0 {
// In most cases, prevHardSt and rd.HardState will be the same because
// when there are new entries to apply we just sent a HardState with
// an updated Commit value. However, on initial startup the two are different
// because we don't send a HardState until something changes, but we do send
// any un-applied but committed entries. Therefore we mark all committed
// entries as applied whether they were included in rd.HardState or not.
// In most cases, prevHardSt and rd.HardState will be the same
// because when there are new entries to apply we just sent a
// HardState with an updated Commit value. However, on initial
// startup the two are different because we don't send a HardState
// until something changes, but we do send any un-applied but
// committed entries (and previously-committed entries may be
// incorporated into the snapshot, even if rd.CommittedEntries is
// empty). Therefore we mark all committed entries as applied
// whether they were included in rd.HardState or not.
g.raft.raftLog.appliedTo(g.prevHardSt.Commit)
}
if len(rd.Entries) > 0 {