环境说明： mysql：5.7 innobackupex: 2.4.21

热备数据（从低版本的 mysql 备份出来的）： mysql：5.6.16, 从下面看出来的

[[email protected] logfile_bak]# cat xtrabackup_info uuid = 24a45c55-9d0c-11e9-999e-7cd30aeb1510 name = tool_name = innobackupex tool_command = --defaults-file=/etc/my3133.cnf --password=... --user=root --host=127.0.0.1 --port=3133 --tmpdir=/home/mysql/backup/3133 --rocksdb_checkpoint_path=/mysqldata/backup_tmp/15526073_6461023 --rds-xb-fd-limits=400000 --slave-info --stream=xbstream --compress --rds-table-level /home/mysql/backup/3133 tool_version = 2.3.10 ibbackup_version = 2.3.10 server_version = 5.6.16-log start_time = 2019-07-02 23:39:56 end_time = 2019-07-03 04:58:29 lock_time = 1 binlog_pos = filename 'mysql-bin.000813', position 326799, GTID of the last change '5a2ce42e-9b9e-11e9-999e-98039b075e04:1-1954113' innodb_from_lsn = 0 innodb_to_lsn = 1064285712580 partial = N incremental = N format = xbstream compact = N compressed = compressed encrypted = N [[email protected] logfile_bak]# innobackupex -v xtrabackup: recognized server arguments: --datadir=/data/data --log_bin=mysql-bin --server-id=2 --log_bin=/data/data_log/log_bin/mysql-bin.log innobackupex version 2.4.21 Linux (x86_64) (revision id: 5988af5) 

这里我严格按照阿里云的规范步骤来进行解包、解压、还原。前两步都正常，还原却卡住了，一直过不去。报错如下：

[[email protected] data]# innobackupex --defaults-file=/data/data/backup-my.cnf --apply-log /data/data xtrabackup: recognized server arguments: --innodb_checksum_algorithm=innodb --innodb_log_checksum_algorithm=innodb --innodb_data_file_path=ibdata1:200M:autoextend --innodb_log_files_in_group=2 --innodb_log_file_size=1572864000 --innodb_fast_checksum=0 --innodb_page_size=16384 --innodb_log_block_size=512 --innodb_undo_directory=. --innodb_undo_tablespaces=0  xtrabackup: recognized client arguments:  210205 16:44:50 innobackupex: Starting the apply-log operation  IMPORTANT: Please check that the apply-log run completes successfully.            At the end of a successful apply-log run innobackupex            prints "completed OK!".  innobackupex version 2.4.21 based on MySQL server 5.7.32 Linux (x86_64) (revision id: 5988af5) xtrabackup: cd to /data/data/ xtrabackup: This target seems to be not prepared yet. InnoDB: Number of pools: 1 xtrabackup: xtrabackup_logfile detected: size=9437184, start_lsn=(1064284351341) xtrabackup: using the following InnoDB configuration for recovery: xtrabackup:   innodb_data_home_dir = . xtrabackup:   innodb_data_file_path = ibdata1:200M:autoextend xtrabackup:   innodb_log_group_home_dir = . xtrabackup:   innodb_log_files_in_group = 1 xtrabackup:   innodb_log_file_size = 9437184 xtrabackup: using the following InnoDB configuration for recovery: xtrabackup:   innodb_data_home_dir = . xtrabackup:   innodb_data_file_path = ibdata1:200M:autoextend xtrabackup:   innodb_log_group_home_dir = . xtrabackup:   innodb_log_files_in_group = 1 xtrabackup:   innodb_log_file_size = 9437184 xtrabackup: Starting InnoDB instance for recovery. xtrabackup: Using 104857600 bytes for buffer pool (set by --use-memory parameter) InnoDB: PUNCH HOLE support available InnoDB: Mutexes and rw_locks use GCC atomic builtins InnoDB: Uses event mutexes InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier InnoDB: Compressed tables use zlib 1.2.7 InnoDB: Number of pools: 1 InnoDB: Not using CPU crc32 instructions InnoDB: Initializing buffer pool, total size = 100M, instances = 1, chunk size = 100M InnoDB: Completed initialization of buffer pool InnoDB: page_cleaner coordinator priority: -20 InnoDB: Highest supported file format is Barracuda. InnoDB: Attempted to open a previously opened tablespace. Previous tablespace mysql/plugin at filepath: ./mysql/plugin.ibd uses space ID: 2. Cannot open filepath: ./mysql/innodb_index_stats.ibd which uses the same space ID. 

我检查了 /data/data/mysql 下，看到是有 innodb_index_stats.ibd 文件的，这里我实在不知道该如何操作了，有没有热心的网友指导一下，给个思路。