enh: adjust the default value of supportVnodes parameters

source/common/src/tglobal.c

@@ -355,7 +355,11 @@ static int32_t taosAddSystemCfg(SConfig *pCfg) {
 static int32_t taosAddServerCfg(SConfig *pCfg) {
   if (cfgAddDir(pCfg, "dataDir", tsDataDir, 0) != 0) return -1;
   if (cfgAddFloat(pCfg, "minimalDataDirGB", 2.0f, 0.001f, 10000000, 0) != 0) return -1;
+
+  tsNumOfSupportVnodes = tsNumOfCores * 2;
+  tsNumOfSupportVnodes = TMAX(tsNumOfSupportVnodes, 2);
   if (cfgAddInt32(pCfg, "supportVnodes", tsNumOfSupportVnodes, 0, 4096, 0) != 0) return -1;
+
   if (cfgAddInt32(pCfg, "maxShellConns", tsMaxShellConns, 10, 50000000, 0) != 0) return -1;
   if (cfgAddInt32(pCfg, "statusInterval", tsStatusInterval, 1, 30, 0) != 0) return -1;
   if (cfgAddInt32(pCfg, "minSlidingTime", tsMinSlidingTime, 10, 1000000, 0) != 0) return -1;