notify vnode when data file is synced, so vnode can restart TSDB

src/inc/tsync.h

@@ -54,8 +54,8 @@ typedef struct {
   int       role[TAOS_SYNC_MAX_REPLICA];  
 } SNodesRole;
  
-// if name is null, get the file from index or after, used by master
-// if name is provided, get the named file at the specified index, used by unsynced node
+// if name is empty(name[0] is zero), get the file from index or after, used by master
+// if name is provided(name[0] is not zero), get the named file at the specified index, used by unsynced node
 // it returns the file magic number and size, if file not there, magic shall be 0.
 typedef uint32_t (*FGetFileInfo)(void *ahandle, char *name, uint32_t *index, int32_t *size); 
 
@@ -72,6 +72,9 @@ typedef void     (*FConfirmForward)(void *ahandle, void *mhandle, int32_t code);
 // when role is changed, call this to notify app
 typedef void     (*FNotifyRole)(void *ahandle, int8_t role);
 
+// when data file is synced successfully, notity app
+typedef void     (*FNotifyFileSynced)(void *ahandle);
+
 typedef struct {
   int32_t    vgId;      // vgroup ID
   uint64_t   version;   // initial version
@@ -84,7 +87,7 @@ typedef struct {
   FWriteToCache   writeToCache;
   FConfirmForward confirmForward;
   FNotifyRole     notifyRole;
-
+  FNotifyFileSynced notifyFileSynced;
 } SSyncInfo;
 
 typedef void* tsync_h;

src/vnode/src/vnodeMain.c

@@ -46,6 +46,7 @@ static int      vnodeWalCallback(void *arg);
 static uint32_t vnodeGetFileInfo(void *ahandle, char *name, uint32_t *index, int32_t *size);
 static int      vnodeGetWalInfo(void *ahandle, char *name, uint32_t *index);
 static void     vnodeNotifyRole(void *ahandle, int8_t role);
+static void     vnodeNotifyFileSynced(void *ahandle);
 
 static pthread_once_t  vnodeModuleInit = PTHREAD_ONCE_INIT;
 
@@ -234,6 +235,7 @@ int32_t vnodeOpen(int32_t vnode, char *rootDir) {
   syncInfo.writeToCache = vnodeWriteToQueue;
   syncInfo.confirmForward = dnodeSendRpcWriteRsp; 
   syncInfo.notifyRole = vnodeNotifyRole;
+  syncInfo.notifyFileSynced = vnodeNotifyFileSynced;
   pVnode->sync = syncStart(&syncInfo);
 
   // start continuous query
@@ -405,6 +407,13 @@ static void vnodeNotifyRole(void *ahandle, int8_t role) {
     cqStop(pVnode->cq);
 }
 
+static void vnodeNotifyFileSynced(void *ahandle) {
+  SVnodeObj *pVnode = ahandle;
+  dTrace("pVnode:%p vgId:%d, data file is synced", pVnode, pVnode->vgId);
+
+  // clsoe tsdb, then open tsdb
+}
+
 static int32_t vnodeSaveCfg(SMDCreateVnodeMsg *pVnodeCfg) {
   char cfgFile[TSDB_FILENAME_LEN + 30] = {0};
   sprintf(cfgFile, "%s/vnode%d/config.json", tsVnodeDir, pVnodeCfg->cfg.vgId);