openraft 0.10.0-alpha.18

Advanced Raft consensus
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

use std::ops::DerefMut;
use std::time::Duration;

use maplit::btreeset;
use pretty_assertions::assert_eq;

use crate::Membership;
use crate::MembershipState;
use crate::Vote;
use crate::engine::Command;
use crate::engine::Engine;
use crate::engine::LogIdList;
use crate::engine::testing::UTConfig;
use crate::engine::testing::log_id;
use crate::progress::Progress;
use crate::storage::SnapshotMeta;
use crate::type_config::TypeConfigExt;
use crate::type_config::alias::EffectiveMembershipOf;
use crate::type_config::alias::StoredMembershipOf;
use crate::utime::Leased;

fn m12() -> Membership<u64, ()> {
    Membership::<u64, ()>::new_with_defaults(vec![btreeset! {1,2}], [])
}

fn eng() -> Engine<UTConfig> {
    let mut eng = Engine::testing_default(0);
    eng.state.enable_validation(false); // Disable validation for incomplete state
    eng.state.membership_state = MembershipState::new(
        EffectiveMembershipOf::<UTConfig>::new_arc(Some(log_id(1, 0, 1)), m12()),
        EffectiveMembershipOf::<UTConfig>::new_arc(Some(log_id(1, 0, 1)), m12()),
    );

    eng.state.log_ids = LogIdList::new(None, [log_id(0, 0, 0)]);
    eng
}

#[test]
fn test_trigger_purge_log_no_snapshot() -> anyhow::Result<()> {
    let mut eng = eng();

    eng.trigger_purge_log(1);

    assert_eq!(None, eng.state.purge_upto, "no snapshot, cannot purge");

    assert_eq!(0, eng.output.take_commands().len());

    Ok(())
}

#[test]
fn test_trigger_purge_log_already_scheduled() -> anyhow::Result<()> {
    let mut eng = eng();
    eng.state.snapshot_meta = SnapshotMeta {
        last_log_id: Some(log_id(1, 0, 3)),
        last_membership: StoredMembershipOf::<UTConfig>::new(Some(log_id(1, 0, 1)), m12()),
        snapshot_id: "1".to_string(),
    };
    eng.state.purge_upto = Some(log_id(1, 0, 2));
    eng.state.io_state.purged = Some(log_id(1, 0, 2));

    eng.trigger_purge_log(2);

    assert_eq!(Some(log_id(1, 0, 2)), eng.state.purge_upto, "already purged, no update");

    assert_eq!(0, eng.output.take_commands().len());

    Ok(())
}

#[test]
fn test_trigger_purge_log_delete_only_in_snapshot_logs() -> anyhow::Result<()> {
    let mut eng = eng();
    eng.state.snapshot_meta = SnapshotMeta {
        last_log_id: Some(log_id(1, 0, 3)),
        last_membership: StoredMembershipOf::<UTConfig>::new(Some(log_id(1, 0, 1)), m12()),
        snapshot_id: "1".to_string(),
    };
    eng.state.purge_upto = Some(log_id(1, 0, 2));
    eng.state.io_state.purged = Some(log_id(1, 0, 2));
    eng.state.log_ids = LogIdList::new(Some(log_id(1, 0, 2)), [log_id(1, 0, 10)]);

    eng.trigger_purge_log(5);

    assert_eq!(
        Some(log_id(1, 0, 3)),
        eng.state.purge_upto,
        "delete only in snapshot logs"
    );

    assert_eq!(
        vec![Command::PurgeLog { upto: log_id(1, 0, 3) },],
        eng.output.take_commands()
    );

    Ok(())
}

#[test]
fn test_trigger_purge_log_in_used_wont_be_delete() -> anyhow::Result<()> {
    let mut eng = eng();
    eng.state.snapshot_meta = SnapshotMeta {
        last_log_id: Some(log_id(1, 0, 3)),
        last_membership: StoredMembershipOf::<UTConfig>::new(Some(log_id(1, 0, 1)), m12()),
        snapshot_id: "1".to_string(),
    };
    eng.state.purge_upto = Some(log_id(1, 0, 2));
    eng.state.io_state.purged = Some(log_id(1, 0, 2));
    eng.state.log_ids = LogIdList::new(Some(log_id(1, 0, 2)), [log_id(1, 0, 10)]);
    eng.state.vote = Leased::new(
        UTConfig::<()>::now(),
        Duration::from_millis(500),
        Vote::new_committed(2, 1),
    );

    // Make it a leader and mark the logs are in flight.
    eng.testing_new_leader();
    let l = eng.leader.as_mut().unwrap();
    let _ = l.progress.get_mut(&2).unwrap().next_send(eng.state.deref_mut(), 10).unwrap();

    eng.trigger_purge_log(5);

    assert_eq!(
        Some(log_id(1, 0, 3)),
        eng.state.purge_upto,
        "delete only in snapshot logs"
    );

    assert_eq!(0, eng.output.take_commands().len(), "in used log wont be deleted");

    Ok(())
}