enh: refactor syncBeginSnapshot and walBeginSnapshot for logRetention

include/libs/wal/wal.h

@@ -66,6 +66,7 @@ typedef struct {
   int64_t commitVer;
   int64_t appliedVer;
   int64_t lastVer;
+  int64_t logRetention;
 } SWalVer;
 
 #pragma pack(push, 1)
@@ -180,7 +181,7 @@ void walFsync(SWal *, bool force);
 int32_t walCommit(SWal *, int64_t ver);
 int32_t walRollback(SWal *, int64_t ver);
 // notify that previous logs can be pruned safely
-int32_t walBeginSnapshot(SWal *, int64_t ver);
+int32_t walBeginSnapshot(SWal *, int64_t ver, int64_t logRetention);
 int32_t walEndSnapshot(SWal *);
 int32_t walRestoreFromSnapshot(SWal *, int64_t ver);
 // for tq

source/dnode/mnode/sdb/src/sdbFile.c

@@ -472,7 +472,7 @@ int32_t sdbWriteFile(SSdb *pSdb, int32_t delta) {
 
   taosThreadMutexLock(&pSdb->filelock);
   if (pSdb->pWal != NULL) {
-    // code = walBeginSnapshot(pSdb->pWal, pSdb->applyIndex);
+    // code = walBeginSnapshot(pSdb->pWal, pSdb->applyIndex, 0);
     if (pSdb->sync == 0) {
       code = 0;
     } else {

source/libs/sync/src/syncMain.c

@@ -270,27 +270,6 @@ int32_t syncBeginSnapshot(int64_t rid, int64_t lastApplyIndex) {
     return -1;
   }
 
-  int32_t code = 0;
-
-  if (syncNodeIsMnode(pSyncNode)) {
-    // mnode
-    int64_t logRetention = SYNC_MNODE_LOG_RETENTION;
-
-    SyncIndex beginIndex = pSyncNode->pLogStore->syncLogBeginIndex(pSyncNode->pLogStore);
-    SyncIndex endIndex = pSyncNode->pLogStore->syncLogEndIndex(pSyncNode->pLogStore);
-    int64_t   logNum = endIndex - beginIndex;
-    bool      isEmpty = pSyncNode->pLogStore->syncLogIsEmpty(pSyncNode->pLogStore);
-
-    if (isEmpty || (!isEmpty && logNum < logRetention)) {
-      sNTrace(pSyncNode, "new-snapshot-index:%" PRId64 ", log-num:%" PRId64 ", empty:%d, do not delete wal",
-              lastApplyIndex, logNum, isEmpty);
-      syncNodeRelease(pSyncNode);
-      return 0;
-    }
-
-    goto _DEL_WAL;
-
-  } else {
   SyncIndex beginIndex = pSyncNode->pLogStore->syncLogBeginIndex(pSyncNode->pLogStore);
   SyncIndex endIndex = pSyncNode->pLogStore->syncLogEndIndex(pSyncNode->pLogStore);
   bool      isEmpty = pSyncNode->pLogStore->syncLogIsEmpty(pSyncNode->pLogStore);
@@ -301,55 +280,28 @@ int32_t syncBeginSnapshot(int64_t rid, int64_t lastApplyIndex) {
     return 0;
   }
 
+  int32_t code = 0;
+  int64_t logRetention = 0;
+
+  if (syncNodeIsMnode(pSyncNode)) {
+    // mnode
+    logRetention = SYNC_MNODE_LOG_RETENTION;
+  } else {
     // vnode
     if (pSyncNode->replicaNum > 1) {
       // multi replicas
-
-      lastApplyIndex = TMAX(lastApplyIndex - SYNC_VNODE_LOG_RETENTION, beginIndex - 1);
-
-      if (pSyncNode->state == TAOS_SYNC_STATE_LEADER) {
-        pSyncNode->minMatchIndex = syncMinMatchIndex(pSyncNode);
-
-        for (int32_t i = 0; i < pSyncNode->peersNum; ++i) {
-          int64_t matchIndex = syncIndexMgrGetIndex(pSyncNode->pMatchIndex, &(pSyncNode->peersId[i]));
-          if (lastApplyIndex > matchIndex) {
-            sNTrace(pSyncNode,
-                    "new-snapshot-index:%" PRId64 " is greater than match-index:%" PRId64
-                    " of dnode:%d, do not delete wal",
-                    lastApplyIndex, matchIndex, DID(&pSyncNode->peersId[i]));
-
-            syncNodeRelease(pSyncNode);
-            return 0;
-          }
+      logRetention = SYNC_VNODE_LOG_RETENTION;
     }
-
-      } else if (pSyncNode->state == TAOS_SYNC_STATE_FOLLOWER) {
-        if (lastApplyIndex > pSyncNode->minMatchIndex) {
-          sNTrace(pSyncNode,
-                  "new-snapshot-index:%" PRId64 " is greater than min-match-index:%" PRId64 ", do not delete wal",
-                  lastApplyIndex, pSyncNode->minMatchIndex);
-          syncNodeRelease(pSyncNode);
-          return 0;
   }
 
-      } else if (pSyncNode->state == TAOS_SYNC_STATE_CANDIDATE) {
-        sNTrace(pSyncNode, "new-snapshot-index:%" PRId64 " candidate, do not delete wal", lastApplyIndex);
-        syncNodeRelease(pSyncNode);
-        return 0;
-
-      } else {
-        sNTrace(pSyncNode, "new-snapshot-index:%" PRId64 " unknown state, do not delete wal", lastApplyIndex);
+  if (pSyncNode->replicaNum > 1) {
+    if (pSyncNode->state != TAOS_SYNC_STATE_LEADER && pSyncNode->state != TAOS_SYNC_STATE_FOLLOWER) {
+      sNTrace(pSyncNode, "new-snapshot-index:%" PRId64 " candidate or unknown state, do not delete wal",
+              lastApplyIndex);
       syncNodeRelease(pSyncNode);
       return 0;
     }
-
-      goto _DEL_WAL;
-
-    } else {
-      // one replica
-
-      goto _DEL_WAL;
-    }
+    logRetention = TMAX(logRetention, lastApplyIndex - pSyncNode->minMatchIndex);
   }
 
 _DEL_WAL:
@@ -366,7 +318,7 @@ _DEL_WAL:
         atomic_store_64(&pSyncNode->snapshottingIndex, lastApplyIndex);
         pSyncNode->snapshottingTime = taosGetTimestampMs();
 
-        code = walBeginSnapshot(pData->pWal, lastApplyIndex);
+        code = walBeginSnapshot(pData->pWal, lastApplyIndex, logRetention);
         if (code == 0) {
           sNTrace(pSyncNode, "wal snapshot begin, index:%" PRId64 ", last apply index:%" PRId64,
                   pSyncNode->snapshottingIndex, lastApplyIndex);

source/libs/wal/src/walWrite.c

@@ -247,21 +247,23 @@ static FORCE_INLINE int32_t walCheckAndRoll(SWal *pWal) {
   return 0;
 }
 
-int32_t walBeginSnapshot(SWal *pWal, int64_t ver) {
+int32_t walBeginSnapshot(SWal *pWal, int64_t ver, int64_t logRetention) {
   taosThreadMutexLock(&pWal->mutex);
-
+  ASSERT(logRetention >= 0);
   pWal->vers.verInSnapshotting = ver;
-  wDebug("vgId:%d, wal begin snapshot for version %" PRId64 ", first ver %" PRId64 ", last ver %" PRId64,
-         pWal->cfg.vgId, ver, pWal->vers.firstVer, pWal->vers.lastVer);
+  pWal->vers.logRetention = logRetention;
+
+  wDebug("vgId:%d, wal begin snapshot for version %" PRId64 ", log retention %" PRId64 " first ver %" PRId64
+         ", last ver %" PRId64,
+         pWal->cfg.vgId, ver, pWal->vers.logRetention, pWal->vers.firstVer, pWal->vers.lastVer);
   // check file rolling
-  if (pWal->cfg.retentionPeriod == 0) {
   if (walGetLastFileSize(pWal) != 0) {
     if (walRollImpl(pWal) < 0) {
       wError("vgId:%d, failed to roll wal files since %s", pWal->cfg.vgId, terrstr());
       goto _err;
     }
   }
-  }
+
   taosThreadMutexUnlock(&pWal->mutex);
   return 0;
 
@@ -275,8 +277,9 @@ int32_t walEndSnapshot(SWal *pWal) {
   taosThreadMutexLock(&pWal->mutex);
   int64_t ver = pWal->vers.verInSnapshotting;
 
-  wDebug("vgId:%d, wal end snapshot for version %" PRId64 ", first ver %" PRId64 ", last ver %" PRId64, pWal->cfg.vgId,
-         ver, pWal->vers.firstVer, pWal->vers.lastVer);
+  wDebug("vgId:%d, wal end snapshot for version %" PRId64 ", log retention %" PRId64 " first ver %" PRId64
+         ", last ver %" PRId64,
+         pWal->cfg.vgId, ver, pWal->vers.logRetention, pWal->vers.firstVer, pWal->vers.lastVer);
 
   if (ver == -1) {
     code = -1;
@@ -286,6 +289,7 @@ int32_t walEndSnapshot(SWal *pWal) {
   pWal->vers.snapshotVer = ver;
   int ts = taosGetTimestampSec();
 
+  ver = TMAX(ver - pWal->vers.logRetention, pWal->vers.firstVer - 1);
   void *pIter = NULL;
   while (1) {
     pIter = taosHashIterate(pWal->pRefHash, pIter);

source/libs/wal/test/walMetaTest.cpp

@@ -264,7 +264,7 @@ TEST_F(WalCleanEnv, rollbackMultiFile) {
     ASSERT_EQ(code, 0);
     ASSERT_EQ(pWal->vers.lastVer, i);
     if (i == 5) {
-      walBeginSnapshot(pWal, i);
+      walBeginSnapshot(pWal, i, 0);
       walEndSnapshot(pWal);
     }
   }
@@ -301,7 +301,7 @@ TEST_F(WalCleanDeleteEnv, roll) {
     ASSERT_EQ(pWal->vers.commitVer, i);
   }
 
-  walBeginSnapshot(pWal, i - 1);
+  walBeginSnapshot(pWal, i - 1, 0);
   ASSERT_EQ(pWal->vers.verInSnapshotting, i - 1);
   walEndSnapshot(pWal);
   ASSERT_EQ(pWal->vers.snapshotVer, i - 1);
@@ -317,7 +317,7 @@ TEST_F(WalCleanDeleteEnv, roll) {
     ASSERT_EQ(pWal->vers.commitVer, i);
   }
 
-  code = walBeginSnapshot(pWal, i - 1);
+  code = walBeginSnapshot(pWal, i - 1, 0);
   ASSERT_EQ(code, 0);
   code = walEndSnapshot(pWal);
   ASSERT_EQ(code, 0);