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integration-cli: cleanup leader election tests

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Ensure convergence before moving on with testing leader election
conditions. This reduce the flakiness of this test when run in different
environments.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2016-07-26 19:11:17 -07:00
parent bb27d017f3
commit 946e23776b
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GPG key ID: FB5F6B2905D7ECF3
1 changed files with 36 additions and 24 deletions
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60
integration-cli/docker_api_swarm_test.go
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@ -431,44 +431,56 @@ func (s *DockerSwarmSuite) TestApiSwarmLeaderElection(c *check.C) {
c.Assert(d1.getNode(c, d2.NodeID).ManagerStatus.Leader, checker.False)
c.Assert(d1.getNode(c, d3.NodeID).ManagerStatus.Leader, checker.False)
leader := d1
d1.Stop() // stop the leader
// stop the leader
leader.Stop()
var (
leader *SwarmDaemon // keep track of leader
followers []*SwarmDaemon // keep track of followers
)
checkLeader := func(nodes ...*SwarmDaemon) checkF {
return func(c *check.C) (interface{}, check.CommentInterface) {
// clear these out before each run
leader = nil
followers = nil
for _, d := range nodes {
if d.getNode(c, d.NodeID).ManagerStatus.Leader {
leader = d
} else {
followers = append(followers, d)
}
}
if leader == nil {
return false, check.Commentf("no leader elected")
}
return true, check.Commentf("elected %v", leader.id)
}
}
// wait for an election to occur
var newleader *SwarmDaemon
for _, d := range []*SwarmDaemon{d2, d3} {
if d.getNode(c, d.NodeID).ManagerStatus.Leader {
newleader = d
break
}
}
waitAndAssert(c, defaultReconciliationTimeout, checkLeader(d2, d3), checker.True)
// assert that we have a new leader
c.Assert(newleader, checker.NotNil)
c.Assert(leader, checker.NotNil)
// add the old leader back
leader.Start()
// Keep track of the current leader, since we want that to be chosen.
stableleader := leader
// clear leader and reinit the followers list
followers := make([]*SwarmDaemon, 0, 3)
// add the d1, the initial leader, back
d1.Start()
// TODO(stevvooe): may need to wait for rejoin here
// wait for possible election
waitAndAssert(c, defaultReconciliationTimeout, checkLeader(d1, d2, d3), checker.True)
// pick out the leader and the followers again
for _, d := range []*SwarmDaemon{d1, d2, d3} {
if d1.getNode(c, d.NodeID).ManagerStatus.Leader {
leader = d
} else {
followers = append(followers, d)
}
}
// verify that we still only have 1 leader and 2 followers
c.Assert(leader, checker.NotNil)
c.Assert(followers, checker.HasLen, 2)
// and that after we added d1 back, the leader hasn't changed
c.Assert(leader.NodeID, checker.Equals, newleader.NodeID)
c.Assert(leader.NodeID, checker.Equals, stableleader.NodeID)
}
func (s *DockerSwarmSuite) TestApiSwarmRaftQuorum(c *check.C) {