enh(sync): add privateTerm into SyncSnapshotRsp, SyncSnapshotSend, SSyncSnapshotReceiver

include/libs/sync/syncTools.h

@@ -398,6 +398,7 @@ typedef struct SyncSnapshotSend {
   SyncTerm  term;
   SyncIndex lastIndex;  // lastIndex of snapshot
   SyncTerm  lastTerm;   // lastTerm of snapshot
+  SyncTerm privateTerm;
   int32_t   seq;
   uint32_t  dataLen;
   char      data[];
@@ -432,6 +433,7 @@ typedef struct SyncSnapshotRsp {
   SyncTerm  term;
   SyncIndex lastIndex;
   SyncTerm  lastTerm;
+  SyncTerm privateTerm;
   int32_t   ack;
 } SyncSnapshotRsp;
 

source/libs/sync/inc/syncSnapshot.h

@@ -55,7 +55,7 @@ void snapshotSenderDoStart(SSyncSnapshotSender *pSender);
 
 SSyncSnapshotSender *snapshotSenderCreate(SSyncNode *pSyncNode, int32_t replicaIndex);
 void                 snapshotSenderDestroy(SSyncSnapshotSender *pSender);
-void                 snapshotSenderStart(SSyncSnapshotSender *pSender);
+// void                 snapshotSenderStart(SSyncSnapshotSender *pSender);
 void    snapshotSenderStop(SSyncSnapshotSender *pSender);
 int32_t snapshotSend(SSyncSnapshotSender *pSender);
 int32_t snapshotReSend(SSyncSnapshotSender *pSender);
@@ -68,6 +68,7 @@ typedef struct SSyncSnapshotReceiver {
   int32_t  ack;
   void *   pWriter;
   SyncTerm term;
+  SyncTerm privateTerm;
 
   SSyncNode *pSyncNode;
   int32_t    replicaIndex;

source/libs/sync/src/syncAppendEntries.c

@@ -576,6 +576,7 @@ int32_t syncNodeOnAppendEntriesSnapshotCb(SSyncNode* ths, SyncAppendEntries* pMs
     pReply->term = ths->pRaftStore->currentTerm;
     pReply->success = false;
     pReply->matchIndex = SYNC_INDEX_INVALID;
+    pReply->privateTerm = pMsg->privateTerm;
 
     SRpcMsg rpcMsg;
     syncAppendEntriesReply2RpcMsg(pReply, &rpcMsg);
@@ -660,6 +661,7 @@ int32_t syncNodeOnAppendEntriesSnapshotCb(SSyncNode* ths, SyncAppendEntries* pMs
     pReply->destId = pMsg->srcId;
     pReply->term = ths->pRaftStore->currentTerm;
     pReply->success = true;
+    pReply->privateTerm = pMsg->privateTerm;
 
     if (hasAppendEntries) {
       pReply->matchIndex = pMsg->prevLogIndex + 1;

source/libs/sync/src/syncAppendEntriesReply.c

@@ -175,21 +175,35 @@ int32_t syncNodeOnAppendEntriesReplySnapshotCb(SSyncNode* ths, SyncAppendEntries
         ASSERT(pSender != NULL);
 
         SyncIndex sentryIndex;
+#if 0
+        SyncIndex sentryIndex;
         if (pSender->start && pSender->term == ths->pRaftStore->currentTerm) {
           // already start
           sentryIndex = pSender->snapshot.lastApplyIndex;
           sTrace("sending snapshot already start: pSender->term:%lu, ths->pRaftStore->currentTerm:%lu", pSender->term,
                  ths->pRaftStore->currentTerm);
 
+        } else {
+          if (pMsg->privateTerm == pSender->privateTerm) {
+            sTrace("same privateTerm, pMsg->privateTerm:%lu, pSender->privateTerm:%lu, do not start snapshot again",
+                   pMsg->privateTerm, pSender->privateTerm);
           } else {
             // start send snapshot, first time
-          sTrace("sending snapshot start first: pSender->term:%lu, ths->pRaftStore->currentTerm:%lu", pSender->term,
-                 ths->pRaftStore->currentTerm);
+            sTrace(
+                "sending snapshot start first: pSender->term:%lu, ths->pRaftStore->currentTerm:%lu, "
+                "pMsg->privateTerm:%lu, pSender->privateTerm:%lu",
+                pSender->term, ths->pRaftStore->currentTerm, pMsg->privateTerm, pSender->privateTerm);
 
             snapshotSenderDoStart(pSender);
             pSender->start = true;
+
+            // update snapshot private term
+            syncIndexMgrSetTerm(ths->pNextIndex, &(pMsg->srcId), pSender->privateTerm);
+          }
+
           sentryIndex = pSender->snapshot.lastApplyIndex;
         }
+#endif
 
         // update nextIndex to sentryIndex + 1
         if (nextIndex <= sentryIndex) {

source/libs/sync/src/syncMessage.c

@@ -1815,6 +1815,9 @@ cJSON* syncSnapshotSend2Json(const SyncSnapshotSend* pMsg) {
     snprintf(u64buf, sizeof(u64buf), "%lu", pMsg->term);
     cJSON_AddStringToObject(pRoot, "term", u64buf);
 
+    snprintf(u64buf, sizeof(u64buf), "%lu", pMsg->privateTerm);
+    cJSON_AddStringToObject(pRoot, "privateTerm", u64buf);
+
     snprintf(u64buf, sizeof(u64buf), "%ld", pMsg->lastIndex);
     cJSON_AddStringToObject(pRoot, "lastIndex", u64buf);
 
@@ -1978,6 +1981,9 @@ cJSON* syncSnapshotRsp2Json(const SyncSnapshotRsp* pMsg) {
     snprintf(u64buf, sizeof(u64buf), "%lu", pMsg->term);
     cJSON_AddStringToObject(pRoot, "term", u64buf);
 
+    snprintf(u64buf, sizeof(u64buf), "%lu", pMsg->privateTerm);
+    cJSON_AddStringToObject(pRoot, "privateTerm", u64buf);
+
     snprintf(u64buf, sizeof(u64buf), "%ld", pMsg->lastIndex);
     cJSON_AddStringToObject(pRoot, "lastIndex", u64buf);
 

source/libs/sync/src/syncReplication.c

@@ -177,6 +177,7 @@ int32_t syncNodeAppendEntriesPeersSnapshot(SSyncNode* pSyncNode) {
     pMsg->prevLogIndex = preLogIndex;
     pMsg->prevLogTerm = preLogTerm;
     pMsg->commitIndex = pSyncNode->commitIndex;
+    pMsg->privateTerm = syncIndexMgrGetTerm(pSyncNode->pNextIndex, pDestId);
 
     // send msg
     syncNodeAppendEntries(pSyncNode, pDestId, pMsg);

source/libs/sync/src/syncSnapshot.c

@@ -14,6 +14,7 @@
  */
 
 #include "syncSnapshot.h"
+#include "syncIndexMgr.h"
 #include "syncRaftLog.h"
 #include "syncRaftStore.h"
 #include "syncUtil.h"
@@ -42,6 +43,7 @@ SSyncSnapshotSender *snapshotSenderCreate(SSyncNode *pSyncNode, int32_t replicaI
     pSender->pSyncNode = pSyncNode;
     pSender->replicaIndex = replicaIndex;
     pSender->term = pSyncNode->pRaftStore->currentTerm;
+    pSender->privateTerm = 0;
     pSender->pSyncNode->pFsm->FpGetSnapshot(pSender->pSyncNode->pFsm, &(pSender->snapshot));
 
     pSender->finish = false;
@@ -90,9 +92,13 @@ void snapshotSenderDoStart(SSyncSnapshotSender *pSender) {
   sTrace("snapshot send begin seq:%d ack:%d send msg:%s", pSender->seq, pSender->ack, msgStr);
   taosMemoryFree(msgStr);
 
+  // when start, increase term
+  ++(pSender->privateTerm);
+
   syncSnapshotSendDestroy(pMsg);
 }
 
+#if 0
 // when entry in snapshot, start sender
 void snapshotSenderStart(SSyncSnapshotSender *pSender) {
   if (!(pSender->start)) {
@@ -142,6 +148,7 @@ void snapshotSenderStart(SSyncSnapshotSender *pSender) {
   sInfo("snapshotSenderStart %s", s);
   taosMemoryFree(s);
 }
+#endif
 
 void snapshotSenderStop(SSyncSnapshotSender *pSender) {
   if (pSender->pReader != NULL) {
@@ -392,6 +399,9 @@ cJSON *snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver) {
     cJSON_AddNumberToObject(pRoot, "replicaIndex", pReceiver->replicaIndex);
     snprintf(u64buf, sizeof(u64buf), "%lu", pReceiver->term);
     cJSON_AddStringToObject(pRoot, "term", u64buf);
+
+    snprintf(u64buf, sizeof(u64buf), "%lu", pReceiver->privateTerm);
+    cJSON_AddStringToObject(pRoot, "privateTerm", u64buf);
   }
 
   cJSON *pJson = cJSON_CreateObject();
@@ -514,6 +524,10 @@ int32_t syncNodeOnSnapshotRspCb(SSyncNode *pSyncNode, SyncSnapshotRsp *pMsg) {
       if (pMsg->ack == SYNC_SNAPSHOT_SEQ_END) {
         pSender->finish = true;
         snapshotSenderStop(pSender);
+
+        // update nextIndex private term
+        syncIndexMgrSetTerm(pSyncNode->pNextIndex, &(pMsg->srcId), pSender->privateTerm);
+
         return 0;
       }
 

source/libs/sync/test/syncIndexMgrTest.cpp

@@ -25,7 +25,6 @@ SRaftId    ids[TSDB_MAX_REPLICA];
 SSyncNode* pSyncNode;
 
 SSyncNode* syncNodeInit() {
-
   pSyncNode = (SSyncNode*)taosMemoryMalloc(sizeof(SSyncNode));
   memset(pSyncNode, 0, sizeof(SSyncNode));
   pSyncNode->replicaNum = replicaNum;

source/libs/sync/test/syncSnapshotReceiverTest.cpp

@@ -46,6 +46,7 @@ SSyncSnapshotReceiver* createReceiver() {
   pReceiver->ack = 20;
   pReceiver->pWriter = (void*)0x11;
   pReceiver->term = 66;
+  pReceiver->privateTerm = 99;
 
   return pReceiver;
 }

source/libs/sync/test/syncSnapshotRspTest.cpp

@@ -21,6 +21,7 @@ SyncSnapshotRsp *createMsg() {
   pMsg->destId.addr = syncUtilAddr2U64("127.0.0.1", 5678);
   pMsg->destId.vgId = 100;
   pMsg->term = 11;
+  pMsg->privateTerm = 99;
   pMsg->lastIndex = 22;
   pMsg->lastTerm = 33;
   pMsg->ack = 44;

source/libs/sync/test/syncSnapshotSendTest.cpp

@@ -21,6 +21,7 @@ SyncSnapshotSend *createMsg() {
   pMsg->destId.addr = syncUtilAddr2U64("127.0.0.1", 5678);
   pMsg->destId.vgId = 100;
   pMsg->term = 11;
+  pMsg->privateTerm = 99;
   pMsg->lastIndex = 22;
   pMsg->lastTerm = 33;
   pMsg->seq = 44;