simplified paxos added more tests
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71472c8544
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0e1e13950d
101
lib/paxos.ex
101
lib/paxos.ex
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@ -1,51 +1,3 @@
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defmodule Ballot do
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def init(name, number \\ 0) do
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{name, number}
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end
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def inc(b, name \\ nil) do
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{old_name, number} = b
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{
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if name == nil do
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old_name
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else
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name
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end,
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number + 1
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}
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end
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defp lexicographical_compare(a, b) do
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cond do
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a == b -> 0
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a > b -> 1
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true -> -1
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end
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end
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defp diff({name1, number1}, {name2, number2}) do
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diff = number1 - number2
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if diff == 0 do
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lexicographical_compare(name1, name2)
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else
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diff
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end
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end
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def compare(b1, operator, b2) do
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operator.(diff(b1, b2), 0)
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end
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end
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#
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#
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# Possible actions
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@ -76,7 +28,6 @@ defmodule Paxos do
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processes: processes,
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leader: nil,
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instmap: %{},
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other_values: %{},
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decided: %{}
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}
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@ -90,6 +41,7 @@ defmodule Paxos do
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instmap =
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Map.put(state.instmap, inst, %{
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value: value,
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other_value: nil,
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ballot: Ballot.init(state.name, 0),
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aborted: false,
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ballot_value: nil,
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@ -172,8 +124,6 @@ defmodule Paxos do
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end
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{:rb_deliver, proc, {:other_propose, inst, value}} ->
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state = %{state | other_values: Map.put(state.other_values, inst, value)}
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cond do
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has_finished(state, inst, true) ->
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EagerReliableBroadcast.broadcast(
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@ -184,6 +134,7 @@ defmodule Paxos do
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true ->
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state = has_or_create(state, inst)
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state = set_instmap(state, inst, fn map -> %{map | other_value: value} end)
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prepare(state, inst)
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end
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@ -399,7 +350,7 @@ defmodule Paxos do
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state.instmap[inst] == nil ->
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state
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state.instmap[inst].value == nil and state.other_values[inst] == nil ->
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state.instmap[inst].value == nil and state.instmap[inst].other_value == nil ->
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state
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state.instmap[inst] != nil and state.instmap[inst].has_sent_prepare ->
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@ -449,7 +400,7 @@ defmodule Paxos do
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a_val =
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if a_val == nil do
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if state.instmap[inst].value == nil do
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state.other_values[inst]
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state.instmap[inst].other_value
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else
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state.instmap[inst].value
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end
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@ -556,3 +507,47 @@ defmodule Paxos do
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end
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end
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defmodule Ballot do
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def init(name, number \\ 0) do
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{name, number}
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end
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def inc(b, name \\ nil) do
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{old_name, number} = b
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{
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if name == nil do
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old_name
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else
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name
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end,
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number + 1
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}
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end
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defp lexicographical_compare(a, b) do
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cond do
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a == b -> 0
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a > b -> 1
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true -> -1
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end
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end
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defp diff({name1, number1}, {name2, number2}) do
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diff = number1 - number2
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if diff == 0 do
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lexicographical_compare(name1, name2)
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else
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diff
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end
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end
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def compare(b1, operator, b2) do
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operator.(diff(b1, b2), 0)
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end
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end
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@ -59,6 +59,60 @@ defmodule PaxosTestAditional do
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end
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end
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# Leader crashes, no concurrent ballots
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def run_non_leader_send_propose_after_leader_elected(name, participants, val) do
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{cpid, pid} = PaxosTest.init(name, participants, true)
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send(cpid, :ready)
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{status, val, a, spare} =
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try do
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receive do
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:start ->
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IO.puts("#{inspect(name)}: started")
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[leader | spare] = Enum.sort(participants)
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[new_leader | _] = spare
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if name == new_leader do
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# Wait a bit for the leader to be elected
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Process.sleep(5000)
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Paxos.propose(pid, 1, val, 10000)
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end
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if name in spare do
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{status, val} = PaxosTest.wait_for_decision(pid, 1, 15000)
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if status != :none,
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do: IO.puts("#{name}: decided #{inspect(val)}"),
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else: IO.puts("#{name}: No decision after 10 seconds")
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{status, val, 10, spare}
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else
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{:killed, :none, -1, spare}
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end
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end
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rescue
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_ -> {:none, :none, 10, []}
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end
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send(cpid, :done)
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receive do
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:all_done ->
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Process.sleep(100)
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ql =
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if name in spare do
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IO.puts("#{name}: #{inspect(ql = Process.info(pid, :message_queue_len))}")
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ql
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else
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{:message_queue_len, -1}
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end
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PaxosTest.kill_paxos(pid, name)
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send(cpid, {:finished, name, pid, status, val, a, ql})
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end
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end
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def run_leader_should_nack_simple(name, participants, val) do
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{cpid, pid} = PaxosTest.init(name, participants, true)
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@ -22,57 +22,63 @@ test_suite = [
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# Use TestUtil.get_local_config(n) to generate a single-node configuration
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# consisting of n processes, all running on the same node.
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# {&PaxosTest.run_simple/3, TestUtil.get_local_config(3), 10,
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# "No failures, no concurrent ballots, 3 local procs"},
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# {&PaxosTest.run_simple/3, TestUtil.get_dist_config(host, 3), 10,
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# "No failures, no concurrent ballots, 3 nodes"},
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# {&PaxosTest.run_simple/3, TestUtil.get_local_config(5), 10,
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# "No failures, no concurrent ballots, 5 local procs"},
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# {&PaxosTest.run_simple_2/3, TestUtil.get_dist_config(host, 3), 10,
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# "No failures, 2 concurrent ballots, 3 nodes"},
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# {&PaxosTest.run_simple_2/3, TestUtil.get_local_config(3), 10,
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# "No failures, 2 concurrent ballots, 3 local procs"},
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# {&PaxosTest.run_simple_3/3, TestUtil.get_local_config(3), 10,
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# "No failures, 2 concurrent instances, 3 local procs"},
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# {&PaxosTest.run_simple_many_1/3, TestUtil.get_dist_config(host, 5), 10,
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# "No failures, many concurrent ballots 1, 5 nodes"},
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# {&PaxosTest.run_simple_many_1/3, TestUtil.get_local_config(5), 10,
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# "No failures, many concurrent ballots 1, 5 local procs"},
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# {&PaxosTest.run_simple_many_2/3, TestUtil.get_dist_config(host, 5), 10,
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# "No failures, many concurrent ballots 2, 5 nodes"},
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# {&PaxosTest.run_simple_many_2/3, TestUtil.get_local_config(5), 10,
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# "No failures, many concurrent ballots 2, 5 local procs"},
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# {&PaxosTest.run_non_leader_crash/3, TestUtil.get_dist_config(host, 3), 10,
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# "One non-leader crashes, no concurrent ballots, 3 nodes"},
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# {&PaxosTest.run_non_leader_crash/3, TestUtil.get_local_config(3), 10,
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# "One non-leader crashes, no concurrent ballots, 3 local procs"},
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# {&PaxosTest.run_minority_non_leader_crash/3, TestUtil.get_dist_config(host, 5), 10,
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# "Minority non-leader crashes, no concurrent ballots"},
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# {&PaxosTest.run_minority_non_leader_crash/3, TestUtil.get_local_config(5), 10,
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# "Minority non-leader crashes, no concurrent ballots"},
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# {&PaxosTest.run_leader_crash_simple/3, TestUtil.get_dist_config(host, 5), 10,
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# "Leader crashes, no concurrent ballots, 5 nodes"},
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# {&PaxosTest.run_leader_crash_simple/3, TestUtil.get_local_config(5), 10,
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# "Leader crashes, no concurrent ballots, 5 local procs"},
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# {&PaxosTest.run_leader_crash_simple_2/3, TestUtil.get_dist_config(host, 7), 10,
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# "Leader and some non-leaders crash, no concurrent ballots, 7 nodes"},
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# {&PaxosTest.run_leader_crash_simple_2/3, TestUtil.get_local_config(7), 10,
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# "Leader and some non-leaders crash, no concurrent ballots, 7 local procs"},
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# {&PaxosTest.run_leader_crash_complex/3, TestUtil.get_dist_config(host, 11), 10,
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# "Cascading failures of leaders and non-leaders, 11 nodes"},
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# {&PaxosTest.run_leader_crash_complex/3, TestUtil.get_local_config(11), 10,
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# "Cascading failures of leaders and non-leaders, 11 local procs"},
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# {&PaxosTest.run_leader_crash_complex_2/3, TestUtil.get_dist_config(host, 11), 10,
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# "Cascading failures of leaders and non-leaders, random delays, 7 nodes"},
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# {&PaxosTest.run_leader_crash_complex_2/3, TestUtil.get_local_config(11), 10,
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# "Cascading failures of leaders and non-leaders, random delays, 7 local procs"},
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{&PaxosTest.run_simple/3, TestUtil.get_local_config(3), 10,
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"No failures, no concurrent ballots, 3 local procs"},
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{&PaxosTest.run_simple/3, TestUtil.get_dist_config(host, 3), 10,
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"No failures, no concurrent ballots, 3 nodes"},
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{&PaxosTest.run_simple/3, TestUtil.get_local_config(5), 10,
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"No failures, no concurrent ballots, 5 local procs"},
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{&PaxosTest.run_simple_2/3, TestUtil.get_dist_config(host, 3), 10,
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"No failures, 2 concurrent ballots, 3 nodes"},
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{&PaxosTest.run_simple_2/3, TestUtil.get_local_config(3), 10,
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"No failures, 2 concurrent ballots, 3 local procs"},
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{&PaxosTest.run_simple_3/3, TestUtil.get_local_config(3), 10,
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"No failures, 2 concurrent instances, 3 local procs"},
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{&PaxosTest.run_simple_many_1/3, TestUtil.get_dist_config(host, 5), 10,
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"No failures, many concurrent ballots 1, 5 nodes"},
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{&PaxosTest.run_simple_many_1/3, TestUtil.get_local_config(5), 10,
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"No failures, many concurrent ballots 1, 5 local procs"},
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{&PaxosTest.run_simple_many_2/3, TestUtil.get_dist_config(host, 5), 10,
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"No failures, many concurrent ballots 2, 5 nodes"},
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{&PaxosTest.run_simple_many_2/3, TestUtil.get_local_config(5), 10,
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"No failures, many concurrent ballots 2, 5 local procs"},
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{&PaxosTest.run_non_leader_crash/3, TestUtil.get_dist_config(host, 3), 10,
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"One non-leader crashes, no concurrent ballots, 3 nodes"},
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{&PaxosTest.run_non_leader_crash/3, TestUtil.get_local_config(3), 10,
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"One non-leader crashes, no concurrent ballots, 3 local procs"},
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{&PaxosTest.run_minority_non_leader_crash/3, TestUtil.get_dist_config(host, 5), 10,
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"Minority non-leader crashes, no concurrent ballots"},
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{&PaxosTest.run_minority_non_leader_crash/3, TestUtil.get_local_config(5), 10,
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"Minority non-leader crashes, no concurrent ballots"},
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{&PaxosTest.run_leader_crash_simple/3, TestUtil.get_dist_config(host, 5), 10,
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"Leader crashes, no concurrent ballots, 5 nodes"},
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{&PaxosTest.run_leader_crash_simple/3, TestUtil.get_local_config(5), 10,
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"Leader crashes, no concurrent ballots, 5 local procs"},
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{&PaxosTest.run_leader_crash_simple_2/3, TestUtil.get_dist_config(host, 7), 10,
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"Leader and some non-leaders crash, no concurrent ballots, 7 nodes"},
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{&PaxosTest.run_leader_crash_simple_2/3, TestUtil.get_local_config(7), 10,
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"Leader and some non-leaders crash, no concurrent ballots, 7 local procs"},
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{&PaxosTest.run_leader_crash_complex/3, TestUtil.get_dist_config(host, 11), 10,
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"Cascading failures of leaders and non-leaders, 11 nodes"},
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{&PaxosTest.run_leader_crash_complex/3, TestUtil.get_local_config(11), 10,
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"Cascading failures of leaders and non-leaders, 11 local procs"},
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{&PaxosTest.run_leader_crash_complex_2/3, TestUtil.get_dist_config(host, 11), 10,
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"Cascading failures of leaders and non-leaders, random delays, 7 nodes"},
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{&PaxosTest.run_leader_crash_complex_2/3, TestUtil.get_local_config(11), 10,
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"Cascading failures of leaders and non-leaders, random delays, 7 local procs"},
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# # Aditional Test functions
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# Aditional Test functions
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# {&PaxosTestAditional.run_leader_crash_simple_before_decision/3, TestUtil.get_dist_config(host, 5), 10,
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# "Leader crashes right before decision, no concurrent ballots, 5 nodes"},
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# {&PaxosTestAditional.run_leader_crash_simple_before_decision/3, TestUtil.get_local_config(5), 10,
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# "Leader crashes right before decision, no concurrent ballots, 5 local procs"},
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{&PaxosTestAditional.run_leader_crash_simple_before_decision/3, TestUtil.get_dist_config(host, 5), 10,
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"Leader crashes right before decision, no concurrent ballots, 5 nodes"},
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{&PaxosTestAditional.run_leader_crash_simple_before_decision/3, TestUtil.get_local_config(5), 10,
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"Leader crashes right before decision, no concurrent ballots, 5 local procs"},
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{&PaxosTestAditional.run_non_leader_send_propose_after_leader_elected/3, TestUtil.get_dist_config(host, 5), 10,
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"Non-Leader proposes after leader is elected, 5 nodes"},
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{&PaxosTestAditional.run_non_leader_send_propose_after_leader_elected/3, TestUtil.get_local_config(5), 10,
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"Non-Leader proposes after leader is elected, 5 local procs"},
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{&PaxosTestAditional.run_leader_should_nack_simple/3, TestUtil.get_dist_config(host, 5), 10,
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"Leader should nack before decision and then come to decision, no concurrent ballots, 5 nodes"},
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