**MNODE的选择:** TDengine逻辑上有管理节点,但没有单独的执行代码,服务器侧只有一套执行代码taosd。那么哪个数据节点会是管理节点呢?这是系统自动决定的,无需任何人工干预。原则如下:一个数据节点启动时,会检查自己的End Point, 并与获取的mnode EP List进行比对,如果在其中,该数据节点认为自己应该启动mnode模块,成为mnode。如果自己的EP不在mnode EP List里,则不启动mnode模块。在系统的运行过程中,由于负载均衡、宕机等原因,mnode有可能迁移至新的dnode,但一切都是透明的,无需人工干预,配置参数的修改,是mnode自己根据资源做出的决定。
snprintf(buffer,BUFFER_SIZE,"create table if not exists %s.%s%d %s;",winfo->db_name,superTblInfo->childTblPrefix,i,superTblInfo->colsOfCreatChildTable);
len+=snprintf(buffer+len,superTblInfo->maxSqlLen-len,"if not exists %s.%s%d using %s.%s tags %s ",winfo->db_name,superTblInfo->childTblPrefix,i,winfo->db_name,superTblInfo->sTblName,tagsValBuf);
len+=snprintf(pstr+len,superTblInfo->maxSqlLen-len,"insert into %s.%s%d using %s.%s tags %s values ",winfo->db_name,superTblInfo->childTblPrefix,tbl_id,winfo->db_name,superTblInfo->sTblName,tagsValBuf);
len+=snprintf(pstr+len,
superTblInfo->maxSqlLen-len,
"insert into %s.%s%d using %s.%s tags %s values ",
winfo->db_name,
superTblInfo->childTblPrefix,
tbl_id,
winfo->db_name,
superTblInfo->sTblName,
tagsValBuf);
}else{
len+=snprintf(pstr+len,superTblInfo->maxSqlLen-len," %s.%s%d using %s.%s tags %s values ",winfo->db_name,superTblInfo->childTblPrefix,tbl_id,winfo->db_name,superTblInfo->sTblName,tagsValBuf);
len+=snprintf(pstr+len,superTblInfo->maxSqlLen-len,"insert into %s.%s%d using %s.%s tags %s values",winfo->db_name,superTblInfo->childTblPrefix,tID,winfo->db_name,superTblInfo->sTblName,tagsValBuf);
printf("====thread[%d] completed total inserted rows: %"PRId64", total affected rows: %"PRId64"====\n",winfo->threadID,totalRowsInserted,totalAffectedRows);
printf("====thread[%d] completed total inserted rows: %"PRId64", total affected rows: %"PRId64"====\n",
printf("####thread[%"PRId64"] complete all sqls to allocate all sub-tables[%d - %d] once queries duration:%.4fs\n\n",taosGetSelfPthreadId(),winfo->start_table_id,winfo->end_table_id,(double)(et-st)/1000.0);
printf("####thread[%"PRId64"] complete all sqls to allocate all sub-tables[%d - %d] once queries duration:%.4fs\n\n",