recovery判断正常关闭

Posted 2022-09-14 yzs的专栏

recv_scan_log_recs
    scanned_lsn += data_len;
    if (scanned_lsn > recv_sys->scanned_lsn)//checkpoint_lsn肯定没刷完
           需要recovery;
     
     if (data_len < OS_FILE_LOG_BLOCK_SIZE) //肯定是最后一个block
          finished = TRUE;
          break;
    
1）scanned_lsn是checkpoint_lsn对齐后的lsn，指向checkpoint_lsn所在block的头部
2）data_len是checkpoint_lsn所在block的redo内容长度
3）recv_sys->scanned_lsn是checkpoint_lsn