[TD-10645][raft]<feature>refactor sync interface

include/libs/sync/sync.h

@@ -119,15 +119,15 @@ typedef struct SStateManager {
   int32_t (*readServerState)(struct SStateManager* stateMng, char** ppBuffer, int* n);
 
   // save serialized cluster state data, buffer will be free by Sync
-  void (*saveCluster)(struct SStateManager* stateMng, const char* buffer, int n);
+  void (*saveClusterState)(struct SStateManager* stateMng, const char* buffer, int n);
 
   // read serialized cluster state data, buffer will be free by Sync
-  int32_t (*readCluster)(struct SStateManager* stateMng, char** ppBuffer, int* n);
+  int32_t (*readClusterState)(struct SStateManager* stateMng, char** ppBuffer, int* n);
 } SStateManager;
 
 typedef struct {
   SyncGroupId   vgId;
-  SyncIndex     snapshotIndex;
+  SyncIndex     appliedIndex;
   SSyncCluster  syncCfg;
   SSyncFSM      fsm;
   SSyncLogStore logStore;

source/libs/sync/inc/raft_log.h

@@ -51,6 +51,8 @@ SyncIndex syncRaftLogSnapshotIndex(SSyncRaftLog* pLog);
 
 SyncTerm syncRaftLogLastTerm(SSyncRaftLog* pLog);
 
+void syncRaftLogAppliedTo(SSyncRaftLog* pLog, SyncIndex appliedIndex);
+
 bool syncRaftLogIsUptodate(SSyncRaftLog* pLog, SyncIndex index, SyncTerm term);
 
 int syncRaftLogNumOfPendingConf(SSyncRaftLog* pLog);

source/libs/sync/inc/raft_replication.h

@@ -20,6 +20,11 @@
 #include "syncInt.h"
 #include "sync_type.h"
 
-int syncRaftReplicate(SSyncRaft* pRaft, int i);
+// syncRaftReplicate sends an append RPC with new entries to the given peer,
+// if necessary. Returns true if a message was sent. The sendIfEmpty
+// argument controls whether messages with no entries will be sent
+// ("empty" messages are useful to convey updated Commit indexes, but
+// are undesirable when we're sending multiple messages in a batch).
+bool syncRaftReplicate(SSyncRaft* pRaft, SSyncRaftProgress* progress, bool sendIfEmpty);
 
 #endif  /* TD_SYNC_RAFT_REPLICATION_H */

source/libs/sync/inc/sync_raft_impl.h

@@ -35,8 +35,20 @@ bool syncRaftIsPromotable(SSyncRaft* pRaft);
 bool syncRaftIsPastElectionTimeout(SSyncRaft* pRaft);
 int  syncRaftQuorum(SSyncRaft* pRaft);
 
+bool syncRaftMaybeCommit(SSyncRaft* pRaft);
+
 ESyncRaftVoteResult  syncRaftPollVote(SSyncRaft* pRaft, SyncNodeId id, 
                                     bool preVote, bool accept, 
                                     int* rejectNum, int *granted);
 
+static FORCE_INLINE bool syncRaftIsEmptyServerState(const SSyncServerState* serverState) {
+  return serverState->commitIndex == 0 &&
+         serverState->term == SYNC_NON_TERM &&
+         serverState->voteFor == SYNC_NON_NODE_ID;
+}
+
+void syncRaftLoadState(SSyncRaft* pRaft, const SSyncServerState* serverState);
+
+void syncRaftBroadcastAppend(SSyncRaft* pRaft);
+
 #endif /* _TD_LIBS_SYNC_RAFT_IMPL_H */

source/libs/sync/inc/sync_raft_progress.h

@@ -58,11 +58,20 @@ typedef enum ESyncRaftProgressState {
   PROGRESS_STATE_SNAPSHOT,
 } ESyncRaftProgressState;
 
+static const char* kProgressStateString[] = {
+	"Probe",
+	"Replicate",
+	"Snapshot",
+};
+
 /**
  * Progress represents a follower’s progress in the view of the leader. Leader maintains
  * progresses of all followers, and sends entries to the follower based on its progress.
  **/
 struct SSyncRaftProgress {
+	// index in raft cluster config
+	int selfIndex;
+
 	SyncNodeId id;
 
   SyncIndex nextIndex;
@@ -133,6 +142,11 @@ struct SSyncRaftProgressMap {
 	SSyncRaftProgress progress[TSDB_MAX_REPLICA];
 };
 
+
+static FORCE_INLINE const char* syncRaftProgressStateString(const SSyncRaftProgress* progress) {
+	return kProgressStateString[progress->state];
+}
+
 void syncRaftInitProgress(int i, SSyncRaft* pRaft, SSyncRaftProgress* progress);
 
 /**

source/libs/sync/inc/sync_raft_progress_tracker.h

@@ -20,6 +20,7 @@
 #include "sync_raft_quorum.h"
 #include "sync_raft_quorum_joint.h"
 #include "sync_raft_progress.h"
+#include "sync_raft_proto.h"
 
 struct SSyncRaftProgressTrackerConfig {
   SSyncRaftQuorumJointConfig voters;
@@ -109,4 +110,6 @@ int syncRaftCheckProgress(const SSyncRaftProgressTrackerConfig* config, SSyncRaf
  **/
 ESyncRaftVoteResult syncRaftTallyVotes(SSyncRaftProgressTracker* tracker, int* rejected, int *granted);
 
+void syncRaftConfigState(const SSyncRaftProgressTracker* tracker, SSyncConfigState* cs);
+
 #endif  /* _TD_LIBS_SYNC_RAFT_PROGRESS_TRACKER_H */

source/libs/sync/inc/sync_raft_quorum_joint.h

@@ -25,8 +25,8 @@
  * majority configurations. Decisions require the support of both majorities.
  **/
 typedef struct SSyncRaftQuorumJointConfig {
-  SSyncCluster outgoing;
-  SSyncCluster incoming;
+  SSyncRaftNodeMap outgoing;
+  SSyncRaftNodeMap incoming;
 } SSyncRaftQuorumJointConfig;
 
 /**

source/libs/sync/inc/sync_type.h

@@ -86,7 +86,7 @@ typedef enum {
   // grant the vote request
   SYNC_RAFT_VOTE_RESP_GRANT   = 1,
 
-  //reject the vote request
+  // reject the vote request
   SYNC_RAFT_VOTE_RESP_REJECT  = 2,
 } ESyncRaftVoteType;
 

source/libs/sync/src/raft.c

@@ -16,14 +16,19 @@
 #include "raft.h"
 #include "raft_configuration.h"
 #include "raft_log.h"
+#include "sync_raft_restore.h"
 #include "raft_replication.h"
+#include "sync_raft_config_change.h"
 #include "sync_raft_progress_tracker.h"
 #include "syncInt.h"
 
 #define RAFT_READ_LOG_MAX_NUM 100
 
 static int deserializeServerStateFromBuffer(SSyncServerState* server, const char* buffer, int n);
-static int deserializeClusterConfigFromBuffer(SSyncClusterConfig* cluster, const char* buffer, int n);
+static int deserializeClusterStateFromBuffer(SSyncConfigState* cluster, const char* buffer, int n);
+
+static void switchToConfig(SSyncRaft* pRaft, const SSyncRaftProgressTrackerConfig* config, 
+                          const SSyncRaftProgressMap* progressMap, SSyncConfigState* cs);
 
 static bool preHandleMessage(SSyncRaft* pRaft, const SSyncMessage* pMsg);
 static bool preHandleNewTermMessage(SSyncRaft* pRaft, const SSyncMessage* pMsg);
@@ -32,14 +37,15 @@ static bool preHandleOldTermMessage(SSyncRaft* pRaft, const SSyncMessage* pMsg);
 int32_t syncRaftStart(SSyncRaft* pRaft, const SSyncInfo* pInfo) {
   SSyncNode* pNode = pRaft->pNode;
   SSyncServerState serverState;
+  SSyncConfigState confState;
   SStateManager* stateManager;
   SSyncLogStore* logStore;
   SSyncFSM* fsm;
-  SyncIndex initIndex = pInfo->snapshotIndex;
   SSyncBuffer buffer[RAFT_READ_LOG_MAX_NUM];
   int nBuf, limit, i;
   char* buf;
   int n;
+  SSyncRaftChanger changer;
 
   memset(pRaft, 0, sizeof(SSyncRaft));
 
@@ -70,8 +76,45 @@ int32_t syncRaftStart(SSyncRaft* pRaft, const SSyncInfo* pInfo) {
     syncError("deserializeServerStateFromBuffer for vgid %d fail", pInfo->vgId);
     return -1;
   }
+  free(buf);
+  //assert(initIndex <= serverState.commitIndex);
+
+  // read config state
+  if (stateManager->readClusterState(stateManager, &buf, &n) != 0) {
+    syncError("readClusterState for vgid %d fail", pInfo->vgId);
+    return -1;
+  }
+  if (deserializeClusterStateFromBuffer(&confState, buf, n) != 0) {
+    syncError("deserializeClusterStateFromBuffer for vgid %d fail", pInfo->vgId);
+    return -1;
+  }
+  free(buf);
+
+  changer = (SSyncRaftChanger) {
+    .tracker = pRaft->tracker,
+    .lastIndex = syncRaftLogLastIndex(pRaft->log),
+  };
+  if (syncRaftRestoreConfig(&changer, &confState) < 0) {
+    syncError("syncRaftRestoreConfig for vgid %d fail", pInfo->vgId);
+    return -1;
+  }
+
+  if (!syncRaftIsEmptyServerState(&serverState)) {
+    syncRaftLoadState(pRaft, &serverState);
+  }
+
+  if (pInfo->appliedIndex > 0) {
+    syncRaftLogAppliedTo(pRaft->log, pInfo->appliedIndex);
+  }
+
+  syncRaftBecomeFollower(pRaft, pRaft->term, SYNC_NON_NODE_ID);
+
+
+#if 0
+
+
+
 
-  assert(initIndex <= serverState.commitIndex);
 
   // restore fsm state from snapshot index + 1 until commitIndex
   ++initIndex;
@@ -96,6 +139,7 @@ int32_t syncRaftStart(SSyncRaft* pRaft, const SSyncInfo* pInfo) {
   syncRaftBecomeFollower(pRaft, pRaft->term, SYNC_NON_NODE_ID);
 
   pRaft->selfIndex = pRaft->cluster.selfIndex;
+#endif
 
   syncInfo("[%d:%d] restore vgid %d state: snapshot index success", 
     pRaft->selfGroupId, pRaft->selfId, pInfo->vgId);
@@ -133,10 +177,77 @@ static int deserializeServerStateFromBuffer(SSyncServerState* server, const char
   return 0;
 }
 
-static int deserializeClusterConfigFromBuffer(SSyncClusterConfig* cluster, const char* buffer, int n) {
+static int deserializeClusterStateFromBuffer(SSyncConfigState* cluster, const char* buffer, int n) {
   return 0;
 }
 
+static void visitProgressMaybeSendAppend(int i, SSyncRaftProgress* progress, void* arg) {
+  syncRaftReplicate(arg, progress, false);
+}
+
+// switchToConfig reconfigures this node to use the provided configuration. It
+// updates the in-memory state and, when necessary, carries out additional
+// actions such as reacting to the removal of nodes or changed quorum
+// requirements.
+//
+// The inputs usually result from restoring a ConfState or applying a ConfChange.
+static void switchToConfig(SSyncRaft* pRaft, const SSyncRaftProgressTrackerConfig* config, 
+                          const SSyncRaftProgressMap* progressMap, SSyncConfigState* cs) {
+  SyncNodeId selfId = pRaft->selfId;
+  int i;
+  bool exist;
+  SSyncRaftProgress* progress = NULL;
+
+  syncRaftConfigState(pRaft->tracker, cs);
+  i = syncRaftFindProgressIndexByNodeId(&pRaft->tracker->progressMap, selfId);
+  exist = (i != -1);
+
+	// Update whether the node itself is a learner, resetting to false when the
+	// node is removed.
+  if (exist) {
+    progress = &pRaft->tracker->progressMap.progress[i];
+    pRaft->isLearner = progress->isLearner;
+  } else {
+    pRaft->isLearner = false;
+  }
+
+  if ((!exist || pRaft->isLearner) && pRaft->state == TAOS_SYNC_STATE_LEADER) {
+		// This node is leader and was removed or demoted. We prevent demotions
+		// at the time writing but hypothetically we handle them the same way as
+		// removing the leader: stepping down into the next Term.
+		//
+		// TODO(tbg): step down (for sanity) and ask follower with largest Match
+		// to TimeoutNow (to avoid interruption). This might still drop some
+		// proposals but it's better than nothing.
+		//
+		// TODO(tbg): test this branch. It is untested at the time of writing.
+    return;
+  }
+
+	// The remaining steps only make sense if this node is the leader and there
+	// are other nodes.
+  if (pRaft->state != TAOS_SYNC_STATE_LEADER || cs->voters.replica == 0) {
+    return;
+  }
+
+  if (syncRaftMaybeCommit(pRaft)) {
+		// If the configuration change means that more entries are committed now,
+		// broadcast/append to everyone in the updated config.
+    syncRaftBroadcastAppend(pRaft);
+  } else {
+		// Otherwise, still probe the newly added replicas; there's no reason to
+		// let them wait out a heartbeat interval (or the next incoming
+		// proposal).
+    syncRaftProgressVisit(pRaft->tracker, visitProgressMaybeSendAppend, pRaft);
+
+    // If the the leadTransferee was removed or demoted, abort the leadership transfer.
+    SyncNodeId leadTransferee = pRaft->leadTransferee;
+    if (leadTransferee != SYNC_NON_NODE_ID) {
+
+    }
+  }
+}
+
 /**
  * pre-handle message, return true means no need to continue
  * Handle the message term, which may result in our stepping down to a follower.

source/libs/sync/src/raft_handle_append_entries_message.c

@@ -33,7 +33,7 @@ int syncRaftHandleAppendEntriesMessage(SSyncRaft* pRaft, const SSyncMessage* pMs
     return 0;
   }
 
-  RaftMsg_Append_Entries *appendResp = &(pRespMsg->appendResp);
+  RaftMsg_Append_Resp *appendResp = &(pRespMsg->appendResp);
   // ignore committed logs
   if (syncRaftLogIsCommitted(pRaft->log, appendEntries->index)) {
     appendResp->index = pRaft->log->commitIndex;

source/libs/sync/src/raft_log.c

@@ -31,6 +31,10 @@ SyncTerm syncRaftLogLastTerm(SSyncRaftLog* pLog) {
   return 0;
 }
 
+void syncRaftLogAppliedTo(SSyncRaftLog* pLog, SyncIndex appliedIndex) {
+
+}
+
 bool syncRaftLogIsUptodate(SSyncRaftLog* pLog, SyncIndex index, SyncTerm term) {
   return true;
 }

source/libs/sync/src/raft_replication.c

@@ -16,106 +16,62 @@
 #include "raft.h"
 #include "raft_log.h"
 #include "sync_raft_progress.h"
+#include "syncInt.h"
 #include "raft_replication.h"
 
-static int sendSnapshot(SSyncRaft* pRaft, int i);
-static int sendAppendEntries(SSyncRaft* pRaft, int i, SyncIndex index, SyncTerm term);
-
-int syncRaftReplicate(SSyncRaft* pRaft, int i) {
-#if 0
+static bool sendSnapshot(SSyncRaft* pRaft, SSyncRaftProgress* progress);
+static bool sendAppendEntries(SSyncRaft* pRaft, SSyncRaftProgress* progress,
+                              SyncIndex prevIndex, SyncTerm prevTerm,
+                              const SSyncRaftEntry *entries, int nEntry);
+
+// syncRaftReplicate sends an append RPC with new entries to the given peer,
+// if necessary. Returns true if a message was sent. The sendIfEmpty
+// argument controls whether messages with no entries will be sent
+// ("empty" messages are useful to convey updated Commit indexes, but
+// are undesirable when we're sending multiple messages in a batch).
+bool syncRaftReplicate(SSyncRaft* pRaft, SSyncRaftProgress* progress, bool sendIfEmpty) {
   assert(pRaft->state == TAOS_SYNC_STATE_LEADER);
-  assert(i >= 0 && i < pRaft->leaderState.nProgress);
+  SyncNodeId nodeId = progress->id;
 
-  SyncNodeId nodeId = pRaft->cluster.nodeInfo[i].nodeId;
-  SSyncRaftProgress* progress = &(pRaft->leaderState.progress[i]);
   if (syncRaftProgressIsPaused(progress)) {
-    syncInfo("node %d paused", nodeId);
-    return 0;
+    syncInfo("node [%d:%d] paused", pRaft->selfGroupId, nodeId);
+    return false;
   }
 
   SyncIndex nextIndex = syncRaftProgressNextIndex(progress);
-  SyncIndex snapshotIndex = syncRaftLogSnapshotIndex(pRaft->log);
-  bool inSnapshot = syncRaftProgressInSnapshot(progress);
+  SSyncRaftEntry *entries;
+  int nEntry;   
   SyncIndex prevIndex;
   SyncTerm prevTerm;
 
-  /**
-   * From Section 3.5:
-   *
-   *   When sending an AppendEntries RPC, the leader includes the index and
-   *   term of the entry in its log that immediately precedes the new
-   *   entries. If the follower does not find an entry in its log with the
-   *   same index and term, then it refuses the new entries. The consistency
-   *   check acts as an induction step: the initial empty state of the logs
-   *   satisfies the Log Matching Property, and the consistency check
-   *   preserves the Log Matching Property whenever logs are extended. As a
-   *   result, whenever AppendEntries returns successfully, the leader knows
-   *   that the follower's log is identical to its own log up through the new
-   *   entries (Log Matching Property in Figure 3.2).
-   **/
-  if (nextIndex == 1) {
-    /**
-     * We're including the very first entry, so prevIndex and prevTerm are
-     * null. If the first entry is not available anymore, send the last
-     * snapshot if we're not already sending one. 
-     **/
-    if (snapshotIndex > 0 && !inSnapshot) {
-      goto send_snapshot;
-    }
+  prevIndex = nextIndex - 1;
+  prevTerm = syncRaftLogTermOf(pRaft->log, prevIndex);
+  int ret = syncRaftLogAcquire(pRaft->log, nextIndex, pRaft->maxMsgSize, &entries, &nEntry);
 
-    // otherwise send append entries from start
-    prevIndex = 0;
-    prevTerm = 0;    
-  } else {
-    /**
-     * Set prevIndex and prevTerm to the index and term of the entry at
-     * nextIndex - 1. 
-     **/ 
-    prevIndex = nextIndex - 1;
-    prevTerm = syncRaftLogTermOf(pRaft->log, prevIndex);
-    /**
-     * If the entry is not anymore in our log, send the last snapshot if we're
-     * not doing so already.
-     **/
-    if (prevTerm == SYNC_NON_TERM && !inSnapshot) {
-      goto send_snapshot;
-    }
+  if (nEntry == 0 && !sendIfEmpty) {
+    return false;
   }
 
-  /* Send empty AppendEntries RPC when installing a snaphot */
-  if (inSnapshot) {
-    prevIndex = syncRaftLogLastIndex(pRaft->log);
-    prevTerm = syncRaftLogLastTerm(pRaft->log);
+  if (ret != 0 || prevTerm == SYNC_NON_TERM) {
+    return sendSnapshot(pRaft, progress);
   }
 
-  return sendAppendEntries(pRaft, i, prevIndex, prevTerm);
-
-send_snapshot:
-  if (syncRaftProgressRecentActive(progress)) {
-    /* Only send a snapshot when we have heard from the server */
-    return sendSnapshot(pRaft, i);
-  } else {
-    /* Send empty AppendEntries RPC when we haven't heard from the server */
-    prevIndex = syncRaftLogLastIndex(pRaft->log);
-    prevTerm  = syncRaftLogLastTerm(pRaft->log);
-    return sendAppendEntries(pRaft, i, prevIndex, prevTerm);
-  }
-#endif
-  return 0;
+  return sendAppendEntries(pRaft, progress, prevIndex, prevTerm, entries, nEntry);
 }
 
-static int sendSnapshot(SSyncRaft* pRaft, int i) {
-  return 0;
+static bool sendSnapshot(SSyncRaft* pRaft, SSyncRaftProgress* progress) {
+  if (!syncRaftProgressRecentActive(progress)) {
+    return false;
+  }
+  return true;
 }
 
-static int sendAppendEntries(SSyncRaft* pRaft, int i, SyncIndex prevIndex, SyncTerm prevTerm) {
-#if 0
-  SyncIndex nextIndex = prevIndex + 1;
-  SSyncRaftEntry *entries;
-  int nEntry;
-  SNodeInfo* pNode = &(pRaft->cluster.nodeInfo[i]);
-  SSyncRaftProgress* progress = &(pRaft->leaderState.progress[i]);
-  syncRaftLogAcquire(pRaft->log, nextIndex, pRaft->maxMsgSize, &entries, &nEntry);
+static bool sendAppendEntries(SSyncRaft* pRaft, SSyncRaftProgress* progress,
+                              SyncIndex prevIndex, SyncTerm prevTerm,
+                              const SSyncRaftEntry *entries, int nEntry) {
+  SyncIndex lastIndex;
+  SyncTerm logTerm = prevTerm;
+  SNodeInfo* pNode = &(pRaft->cluster.nodeInfo[progress->selfIndex]);
 
   SSyncMessage* msg = syncNewAppendMsg(pRaft->selfGroupId, pRaft->selfId, pRaft->term,
                                       prevIndex, prevTerm, pRaft->log->commitIndex,
@@ -125,24 +81,27 @@ static int sendAppendEntries(SSyncRaft* pRaft, int i, SyncIndex prevIndex, SyncT
     goto err_release_log;
   }
 
-  pRaft->io.send(msg, pNode);
-
-  if (syncRaftProgressInReplicate(progress)) {
-    SyncIndex lastIndex = nextIndex + nEntry;
-    syncRaftProgressOptimisticNextIndex(progress, lastIndex);
-    syncRaftInflightAdd(&progress->inflights, lastIndex);
-  } else if (syncRaftProgressInProbe(progress)) {
-    syncRaftProgressPause(progress);
-  } else {
-
+  if (nEntry != 0) {
+    switch (progress->state) {
+    // optimistically increase the next when in StateReplicate
+    case PROGRESS_STATE_REPLICATE:
+      lastIndex = entries[nEntry - 1].index;
+      syncRaftProgressOptimisticNextIndex(progress, lastIndex);
+      syncRaftInflightAdd(&progress->inflights, lastIndex);
+      break;
+    case PROGRESS_STATE_PROBE:
+      progress->probeSent = true;
+      break;
+    default:
+      syncFatal("[%d:%d] is sending append in unhandled state %s", 
+                pRaft->selfGroupId, pRaft->selfId, syncRaftProgressStateString(progress));
+      break;
+    }
   }
-
-  syncRaftProgressUpdateSendTick(progress, pRaft->currentTick);
-
-  return 0;
+  pRaft->io.send(msg, pNode);
+  return true;
 
 err_release_log:
-  syncRaftLogRelease(pRaft->log, nextIndex, entries, nEntry);
-#endif
-  return 0;
-}
+  syncRaftLogRelease(pRaft->log, prevIndex + 1, entries, nEntry);
+  return false;
+}
\ No newline at end of file

source/libs/sync/src/sync_raft_impl.c

@@ -31,7 +31,6 @@ static void tickElection(SSyncRaft* pRaft);
 static void tickHeartbeat(SSyncRaft* pRaft);
 
 static void appendEntries(SSyncRaft* pRaft, SSyncRaftEntry* entries, int n);
-static bool maybeCommit(SSyncRaft* pRaft);
 
 static void abortLeaderTransfer(SSyncRaft* pRaft);
 
@@ -171,6 +170,25 @@ ESyncRaftVoteResult  syncRaftPollVote(SSyncRaft* pRaft, SyncNodeId id,
   return granted;
 */
 
+void syncRaftLoadState(SSyncRaft* pRaft, const SSyncServerState* serverState) {
+  SyncIndex commitIndex = serverState->commitIndex;
+  SyncIndex lastIndex = syncRaftLogLastIndex(pRaft->log);
+
+  if (commitIndex < pRaft->log->commitIndex || commitIndex > lastIndex) {
+    syncFatal("[%d:%d] state.commit %"PRId64" is out of range [%" PRId64 ",%" PRId64 "",
+      pRaft->selfGroupId, pRaft->selfId, commitIndex, pRaft->log->commitIndex, lastIndex);
+    return;
+  }
+
+  pRaft->log->commitIndex = commitIndex;
+  pRaft->term = serverState->term;
+  pRaft->voteFor = serverState->voteFor;
+}
+
+void syncRaftBroadcastAppend(SSyncRaft* pRaft) {
+
+}
+
 static int convertClear(SSyncRaft* pRaft) {
 
 }
@@ -245,16 +263,14 @@ static void appendEntries(SSyncRaft* pRaft, SSyncRaftEntry* entries, int n) {
 
   SSyncRaftProgress* progress = &(pRaft->tracker->progressMap.progress[pRaft->cluster.selfIndex]);
   syncRaftProgressMaybeUpdate(progress, lastIndex);
-  // Regardless of maybeCommit's return, our caller will call bcastAppend.
-  maybeCommit(pRaft);
+  // Regardless of syncRaftMaybeCommit's return, our caller will call bcastAppend.
+  syncRaftMaybeCommit(pRaft);
 }
 
-/**
- * maybeCommit attempts to advance the commit index. Returns true if
- * the commit index changed (in which case the caller should call
- * r.bcastAppend).
- **/
-static bool maybeCommit(SSyncRaft* pRaft) {
+// syncRaftMaybeCommit attempts to advance the commit index. Returns true if
+// the commit index changed (in which case the caller should call
+// r.bcastAppend).
+bool syncRaftMaybeCommit(SSyncRaft* pRaft) {
   
   return true;
 }

source/libs/sync/src/sync_raft_progress_tracker.c

@@ -14,6 +14,7 @@
  */
 
 #include "sync_raft_progress_tracker.h"
+#include "sync_raft_proto.h"
 
 SSyncRaftProgressTracker* syncRaftOpenProgressTracker() {
   SSyncRaftProgressTracker* tracker = (SSyncRaftProgressTracker*)malloc(sizeof(SSyncRaftProgressTracker));
@@ -77,4 +78,11 @@ ESyncRaftVoteResult syncRaftTallyVotes(SSyncRaftProgressTracker* tracker, int* r
   if (rejected) *rejected = r;
   if (granted) *granted = g;
   return syncRaftVoteResult(&(tracker->config.voters), tracker->votes);
+}
+
+void syncRaftConfigState(const SSyncRaftProgressTracker* tracker, SSyncConfigState* cs) {
+  memcpy(&cs->voters, &tracker->config.voters.incoming, sizeof(SSyncRaftNodeMap));
+  memcpy(&cs->votersOutgoing, &tracker->config.voters.outgoing, sizeof(SSyncRaftNodeMap));
+  memcpy(&cs->learners, &tracker->config.learners, sizeof(SSyncRaftNodeMap));
+  memcpy(&cs->learnersNext, &tracker->config.learnersNext, sizeof(SSyncRaftNodeMap));
 }
\ No newline at end of file

source/libs/sync/src/sync_raft_restore.c

@@ -48,7 +48,7 @@ int syncRaftRestoreConfig(SSyncRaftChanger* changer, const SSyncConfigState* cs)
         .n = 1,
         .changes = &incoming.changes[i],
       };
-      ret = syncRaftChangerSimpleConfig(changer, &css, &config, &progressMap);
+      ret = syncRaftChangerSimpleConfig(changer, &css, config, progressMap);
       if (ret != 0) {
         goto out;
       }