bahman/scylla
1
0
Fork 0
Code Issues Pull Requests Actions 3 Packages Projects Releases Wiki Activity

raft: server: track last persisted snapshot descriptor index

Browse Source 
Also introduce a condition variable notified whenever this index is
updated.

Will be user in following commits.
This commit is contained in:
Kamil Braun
2024-01-22 15:38:17 +01:00
parent 1e786d9d64
commit 3268be3860
1 changed files with 9 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
raft/server.cc
View File

@@ -122,6 +122,8 @@ private:
std::optional<shared_promise<>> _state_change_promise; std::optional<shared_promise<>> _state_change_promise;
// Index of the last entry applied to `_state_machine`. // Index of the last entry applied to `_state_machine`.
index_t _applied_idx; index_t _applied_idx;
// Index of the last persisted snapshot descriptor.
index_t _snapshot_desc_idx;
std::list<active_read> _reads; std::list<active_read> _reads;
std::multimap<index_t, awaited_index> _awaited_indexes; std::multimap<index_t, awaited_index> _awaited_indexes;
@@ -134,6 +136,9 @@ private:
// Signaled when apply index is changed // Signaled when apply index is changed
condition_variable _applied_index_changed; condition_variable _applied_index_changed;
// Signaled when _snapshot_desc_idx is changed
condition_variable _snapshot_desc_idx_changed;
struct stop_apply_fiber{}; // exception to send when apply fiber is needs to be stopepd struct stop_apply_fiber{}; // exception to send when apply fiber is needs to be stopepd
struct removed_from_config{}; // sent to applier_fiber when we're not a leader and we're outside the current configuration struct removed_from_config{}; // sent to applier_fiber when we're not a leader and we're outside the current configuration
@@ -371,9 +376,10 @@ future<> server_impl::start() {
_events); _events);
_applied_idx = index_t{0}; _applied_idx = index_t{0};
_snapshot_desc_idx = index_t{0};
if (snapshot.id) { if (snapshot.id) {
co_await _state_machine->load_snapshot(snapshot.id); co_await _state_machine->load_snapshot(snapshot.id);
_applied_idx = snapshot.idx; _snapshot_desc_idx = _applied_idx = snapshot.idx;
} }
if (!rpc_config.current.empty()) { if (!rpc_config.current.empty()) {
@@ -1017,6 +1023,8 @@ future<> server_impl::process_fsm_output(index_t& last_stable, fsm_output&& batc
logger.trace("[{}] io_fiber storing snapshot {}", _id, snp.id); logger.trace("[{}] io_fiber storing snapshot {}", _id, snp.id);
// Persist the snapshot // Persist the snapshot
co_await _persistence->store_snapshot_descriptor(snp, max_trailing_entries); co_await _persistence->store_snapshot_descriptor(snp, max_trailing_entries);
_snapshot_desc_idx = snp.idx;
_snapshot_desc_idx_changed.broadcast();
_stats.store_snapshot++; _stats.store_snapshot++;
// If this is locally generated snapshot there is no need to // If this is locally generated snapshot there is no need to
// load it. // load it.