本过程调用函数srv_undo_tablespaces_init进行，栈帧如下：
#0 srv_undo_tablespaces_init (create_new_db=true, n_conf_tablespaces=4, n_opened=0x2ef55b0)
at /root/mysqlc/percona-server-locks-detail-5.7.22/storage/innobase/srv/srv0start.cc:824
#1 0x0000000001bbd7e0 in innobase_start_or_create_for_mysql () at /root/mysqlc/percona-server-locks-detail-5.7.22/storage/innobase/srv/srv0start.cc:2188
#2 0x00000000019ca74e in innobase_init (p=0x2f2a420) at /root/mysqlc/percona-server-locks-detail-5.7.22/storage/innobase/handler/ha_innodb.cc:4409
#3 0x0000000000f7ec2a in ha_initialize_handlerton (plugin=0x2fca110) at /root/mysqlc/percona-server-locks-detail-5.7.22/sql/handler.cc:871
#4 0x00000000015f9edf in plugin_initialize (plugin=0x2fca110) at /root/mysqlc/percona-server-locks-detail-5.7.22/sql/sql_plugin.cc:1252
本过程主要有如下几个步骤：
根据参数innodb_undo_tablespaces 的配置通过调用srv_undo_tablespace_create分别进行文件建立，默认建立的大小为10M：
for (i = 0; create_new_db && i < n_conf_tablespaces; ++i) //n_conf_tablespaces 为innodb_undo_tablespaces的配置的个数
/** Default undo tablespace size in UNIV_PAGEs count (10MB). */
const ulint SRV_UNDO_TABLESPACE_SIZE_IN_PAGES =
((1024 * 1024) * 10) / UNIV_PAGE_SIZE_DEF;
...
err = srv_undo_tablespace_create(
name, SRV_UNDO_TABLESPACE_SIZE_IN_PAGES); //建立undo文件
...
本步骤会有一个注释如下：
/* Create the undo spaces only if we are creating a new
instance. We don‘t allow creating of new undo tablespaces
in an existing instance (yet). This restriction exists because
we check in several places for SYSTEM tablespaces to be less than
the min of user defined tablespace ids. Once we implement saving
the location of the undo tablespaces and their space ids this
restriction will/should be lifted. */
简单的讲就是建立undo tablespace只能在初始化实例的时候，因为space id已经固定了。
分别对4个undo tablespace调用srv_undo_tablespace_open 其主要调用fil_space_create 和 fil_node_create将新建立的undo tablespace加入Innodb的文件体系。
for (i = 0; i < n_undo_tablespaces; ++i) {
....
err = srv_undo_tablespace_open(name, undo_tablespace_ids[i]); //打开UNDO文件 建立 file node
...
}
分别对4个undo tablespace 进行fsp header初始化
for (i = 0; i < n_undo_tablespaces; ++i) {
fsp_header_init( //初始化fsp header 明显 space id 已经写入
undo_tablespace_ids[i],
SRV_UNDO_TABLESPACE_SIZE_IN_PAGES, &mtr); //SRV_UNDO_TABLESPACE_SIZE_IN_PAGES 默认的undo大小 10MB
}
其中fsp_header_init部分代码如下：
mlog_write_ulint(header + FSP_SPACE_ID, space_id, MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_NOT_USED, 0, MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_SIZE, size, MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_FREE_LIMIT, 0, MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_SPACE_FLAGS, space->flags,
MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_FRAG_N_USED, 0, MLOG_4BYTES, mtr);
flst_init(header + FSP_FREE, mtr);
flst_init(header + FSP_FREE_FRAG, mtr);
flst_init(header + FSP_FULL_FRAG, mtr);
flst_init(header + FSP_SEG_INODES_FULL, mtr);
flst_init(header + FSP_SEG_INODES_FREE, mtr);
这些都是fsp的内容。
做完这个步骤只是生成了4个大小为10MB的 undo tablespace文件，并且已经加入到Innodb文件体系，但是里面没有任何类容。
原文地址：https://www.cnblogs.com/liyanyan665/p/11311290.html