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log0recv.cc
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log0recv.cc
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#include "log0recv.h"
#include "mem0mem.h"
#include "buf0buf.h"
#include "buf0flu.h"
#include "buf0rea.h"
#include "srv0srv.h"
#include "mtr0mtr.h"
#include "mtr0log.h"
#include "page0page.h"
#include "page0cur.h"
#include "btr0btr.h"
#include "btr0cur.h"
#include "ibuf0ibuf.h"
#include "trx0undo.h"
#include "trx0rec.h"
#include "trx0roll.h"
#include "btr0cur.h"
#include "btr0cur.h"
#include "btr0cur.h"
#include "dict0boot.h"
#include "fil0fil.h"
#define RECV_DATA_BLOCK_SIZE (MEM_MAX_ALLOC_IN_BUF - sizeof(recv_data_t))
#define RECV_READ_AHEAD_AREA 32
recv_sys_t* recv_sys = NULL;
ibool recv_recovery_on = FALSE;
ibool recv_recovery_from_backup_on = FALSE;
ibool recv_needed_recovery = FALSE;
ibool recv_no_ibuf_operations = FALSE;
ulint recv_scan_print_counter = 0;
ibool recv_is_from_backup = FALSE;
ibool recv_is_making_a_backup = FALSE;
ulint recv_previous_parsed_rec_type = 999999;
ulint recv_previous_parsed_rec_offset = 0;
ulint recv_previous_parsed_rec_is_multi = 0;
#define SYS_MUTEX &(recv_sys->mutex)
/***************************************************************/
/*构建一个系统恢复对象recv_sys*/
void recv_sys_create()
{
if(recv_sys == NULL){
recv_sys = mem_alloc(sizeof(recv_sys_t));
mutex_create(&(recv_sys->mutex));
mutex_set_level(&(recv_sys->mutex), SYNC_RECV);
recv_sys->heap = NULL;
recv_sys->addr_hash = NULL;
}
}
/*初始化recv_sys*/
void recv_sys_init(ibool recover_from_backup, ulint available_memory)
{
if(recv_sys->heap != NULL)
return ;
mutex_enter(SYS_MUTEX);
if(!recover_from_backup)
recv_sys->heap = mem_heap_create_in_buffer(256);
else{
recv_sys->heap = mem_heap_create(256);
recv_is_from_backup = TRUE;
}
recv_sys->buf = ut_malloc(RECV_PARSING_BUF_SIZE);
recv_sys->len = 0;
recv_sys->recovered_offset = 0;
/*建立hash table*/
recv_sys->addr_hash = hash_create(available_memory / 64);
recv_sys->n_addrs = 0;
recv_sys->apply_log_recs = FALSE;
recv_sys->apply_batch_on = FALSE;
recv_sys->last_block_buf_start = mem_alloc(2 * OS_FILE_LOG_BLOCK_SIZE);
recv_sys->last_block = ut_align(recv_sys->last_block_buf_start, OS_FILE_LOG_BLOCK_SIZE);
recv_sys->found_corrupt_log = FALSE;
mutex_exit(SYS_MUTEX);
}
static void recv_sys_empty_hash()
{
ut_ad(mutex_own(SYS_MUTEX));
ut_a(recv_sys->n_addrs == 0);
/*清空hash table和heap*/
hash_table_free(recv_sys->addr_hash);
mem_heap_empty(recv_sys->heap);
/*重新建立一个addr_hash*/
recv_sys->addr_hash = hash_create(buf_pool_get_curr_size() / 256);
}
/*释放recv_sys对象*/
void recv_sys_free()
{
mutex_enter(SYS_MUTEX);
hash_table_free(recv_sys->addr_hash);
mem_heap_free(recv_sys->heap);
ut_free(recv_sys->buf);
mem_free(recv_sys->last_block_buf_start);
recv_sys->addr_hash = NULL;
recv_sys->heap = NULL;
mutex_exit(SYS_MUTEX);
}
static void recv_truncate_group(log_group_t* group, dulint recovered_lsn, dulint limit_lsn, dulint checkpoint_lsn, dulint archived_lsn)
{
dulint start_lsn;
dulint end_lsn;
dulint finish_lsn1;
dulint finish_lsn2;
dulint finish_lsn;
ulint len;
ulint i;
/*无archive file模式*/
if(ut_dulint_cmp(archived_lsn, ut_dulint_max) == 0)
archived_lsn = checkpoint_lsn;
finish_lsn1 = ut_dulint_add(ut_dulint_align_down(archived_lsn, OS_FILE_LOG_BLOCK_SIZE), log_group_get_capacity(group));
finish_lsn2 = ut_dulint_add(ut_dulint_align_up(recovered_lsn, OS_FILE_LOG_BLOCK_SIZE), recv_sys->last_log_buf_size);
if(ut_dulint_cmp(limit_lsn, ut_dulint_max) != 0)
finish_lsn = finish_lsn1;
else
finish_lsn = ut_dulint_get_min(finish_lsn1, finish_lsn2);
ut_a(RECV_SCAN_SIZE <= log_sys->buf_size);
for(i = 0; i < RECV_SCAN_SIZE; i ++)
*(log_sys->buf + i) = 0;
start_lsn = ut_dulint_align_down(recovered_lsn, OS_FILE_LOG_BLOCK_SIZE);
if(ut_dulint_cmp(start_lsn, recovered_lsn) != 0) {
ut_memcpy(log_sys->buf, recv_sys->last_block, OS_FILE_LOG_BLOCK_SIZE);
log_block_set_data_len(log_sys->buf, ut_dulint_minus(recovered_lsn, start_lsn));
}
if(ut_dulint_cmp(start_lsn, finish_lsn) >= 0)
return ;
for(;;){
end_lsn = ut_dulint_add(start_lsn, RECV_SCAN_SIZE);
if (ut_dulint_cmp(end_lsn, finish_lsn) > 0)
end_lsn = finish_lsn;
len = ut_dulint_minus(end_lsn, start_lsn);
log_group_write_buf(LOG_RECOVER, group, log_sys->buf, len, start_lsn, 0);
if(ut_dulint_cmp(end_lsn, finish_lsn) >= 0)
return ;
for(i = 0; i < RECV_SCAN_SIZE; i ++)
*(log_sys->buf + i) = 0;
start_lsn = end_lsn;
}
}
/*将up_to_data_group中的日志拷贝到group当中*/
static void recv_copy_group(log_group_t* up_to_date_group, log_group_t* group, dulint recovered_lsn)
{
dulint start_lsn;
dulint end_lsn;
ulint len;
if(ut_dulint_cmp(group->scanned_lsn, recovered_lsn) >= 0)
return ;
ut_a(RECV_SCAN_SIZE <= log_sys->buf_size);
start_lsn = ut_dulint_align_down(group->scanned_lsn, OS_FILE_LOG_BLOCK_SIZE);
for(;;){
end_lsn = ut_dulint_add(start_lsn, RECV_SCAN_SIZE);
if (ut_dulint_cmp(end_lsn, recovered_lsn) > 0)
end_lsn = ut_dulint_align_up(recovered_lsn, OS_FILE_LOG_BLOCK_SIZE);
/*从up_to_date_group读取一个日志seg*/
log_group_read_log_seg(LOG_RECOVER, log_sys->buf, up_to_date_group, start_lsn, end_lsn);
/*将读出的日志写入到group当中*/
len = ut_dulint_minus(end_lsn, start_len);
log_group_write_buf(LOG_RECOVER, group, log_sys->buf, len, start_lsn, 0);
if(ut_dulint_cmp(end_lsn, recovered_lsn) >= 0)
return ;
start_lsn = end_lsn;
}
}
/*将up_to_date_group中的日志同步到其的group当中*/
void recv_synchronize_groups(log_group_t* up_to_date_group)
{
log_group_t* group;
dulint start_lsn;
dulint end_lsn;
dulint recovered_lsn;
dulint limit_lsn;
recovered_lsn = recv_sys->recovered_lsn;
limit_lsn = recv_sys->limit_lsn;
start_lsn = ut_dulint_align_down(recovered_lsn, OS_FILE_LOG_BLOCK_SIZE);
end_lsn = ut_dulint_align_up(recovered_lsn, OS_FILE_LOG_BLOCK_SIZE);
ut_a(ut_dulint_cmp(start_lsn, end_lsn) != 0);
/*从up_to_date_group中读取一个日志片段到last_block中*/
log_group_read_log_seg(LOG_RECOVER, recv_sys->last_block, up_to_date_group, start_lsn, end_lsn);
group = UT_LIST_GET_FIRST(log_sys->log_groups);
while(group){
if(group != up_to_date_group) /*做group 日志复制*/
recv_copy_group(group, up_to_date_group, recovered_lsn);
/*设置新的LSN*/
log_group_set_fields(group, recovered_lsn);
group = UT_LIST_GET_NEXT(log_groups, group);
}
/*为日志建立一个checkpoint*/
log_groups_write_checkpoint_info();
mutex_exit(&log_sys->mutex);
/*释放log_sys->mutex,等待建立checkpoint完成*/
rw_lock_s_lock(&(log_sys->checkpoint_lock));
rw_lock_s_unlock(&(log_sys->checkpoint_lock));
mutex_enter(&(log_sys->mutex));
}
/*检查checkpoint的合法性*/
static ibool recv_check_cp_is_consistent(byte* buf)
{
ulint fold;
/*计算第一个校验值*/
fold = ut_fold_binary(buf, LOG_CHECKPOINT_CHECKSUM_1);
if((fold & 0xFFFFFFFF) != mach_read_from_4(buf, + LOG_CHECKPOINT_CHECKSUM_1))
return FALSE;
/*计算第二个校验值*/
fold = ut_fold_binary(buf + LOG_CHECKPOINT_LSN, LOG_CHECKPOINT_CHECKSUM_2 - LOG_CHECKPOINT_LSN);
if ((fold & 0xFFFFFFFF) != mach_read_from_4(buf + LOG_CHECKPOINT_CHECKSUM_2))
return FALSE;
return TRUE;
}
/*在groups中查找LSN最大的checkpoint*/
static ulint recv_find_max_checkpoint(log_group_t** max_group, ulint* max_field)
{
log_group_t* group;
dulint max_no;
dulint checkpoint_no;
ulint field;
byte* buf;
group = UT_LIST_GET_FIRST(log_sys->log_groups);
max_no = ut_dulint_zero;
*max_group = NULL;
buf = log_sys->checkpoint_buf;
while(group){
group->state = LOG_GROUP_CORRUPTED;
for(field = LOG_CHECKPOINT_1; field <= LOG_CHECKPOINT_2; field += LOG_CHECKPOINT_2 - LOG_CHECKPOINT_1){
/*从group的文件中读取一个checkpoint信息到log_sys->checkpoint_buf里面*/
log_group_read_checkpoint_info(group, field);
if(!recv_check_cp_is_consistent(buf)){ /*校验checkpoint信息的合法性*/
if (log_debug_writes)
fprintf(stderr, "InnoDB: Checkpoint in group %lu at %lu invalid, %lu\n",
group->id, field, mach_read_from_4(buf + LOG_CHECKPOINT_CHECKSUM_1));
goto not_consistent;
}
/*从checkpoint buf中读取对应的checkpoint信息*/
group->state = LOG_GROUP_OK;
group->lsn = mach_read_from_8(buf + LOG_CHECKPOINT_LSN);
group->lsn_offset = mach_read_from_4(buf + LOG_CHECKPOINT_OFFSET);
checkpoint_no = mach_read_from_8(buf + LOG_CHECKPOINT_NO);
if(log_debug_writes)
fprintf(stderr, "InnoDB: Checkpoint number %lu found in group %lu\n", ut_dulint_get_low(checkpoint_no), group->id);
if(ut_dulint_cmp(checkpoint_no, max_no)){ /*比较checkpoint no序号*/
*max_group = group;
*max_field = field;
max_no = checkpoint_no;
}
not_consistent:
;
}
group = UT_LIST_GET_NEXT(log_groups, group);
}
if(*max_group == NULL){
fprintf(stderr,
"InnoDB: No valid checkpoint found.\n"
"InnoDB: If this error appears when you are creating an InnoDB database,\n"
"InnoDB: the problem may be that during an earlier attempt you managed\n"
"InnoDB: to create the InnoDB data files, but log file creation failed.\n"
"InnoDB: If that is the case, please refer to section 3.1 of\n"
"InnoDB: http://www.innodb.com/ibman.html\n");
return DB_ERROR;
}
return DB_SUCCESS;
}
ibool recv_read_cp_info_for_backup(byte* hdr, dulint* lsn, ulint* offset, ulint* fsp_limit, dulint* cp_no, dulint* first_header_lsn)
{
ulint max_cp = 0;
dulint max_cp_no = ut_dulint_zero;
byte* cp_buf;
cp_buf = hdr + LOG_CHECKPOINT_1;
if(recv_check_cp_is_consistent(cp_buf)){
max_cp_no = mach_read_from_8(cp_buf + LOG_CHECKPOINT_NO);
max_cp = LOG_CHECKPOINT_1;
}
cp_buf = hdr + LOG_CHECKPOINT_2;
if (recv_check_cp_is_consistent(cp_buf)) {
if (ut_dulint_cmp(mach_read_from_8(cp_buf + LOG_CHECKPOINT_NO), max_cp_no) > 0) /*比LOG_CHECKPOINT_1中的序号大,将其设置为真正的checkpoint*/
max_cp = LOG_CHECKPOINT_2;
}
if(max_cp == 0)
return FALSE;
/*将选定的检查点信息从BUF中读取出来*/
cp_buf = hdr + max_cp;
*lsn = mach_read_from_8(cp_buf + LOG_CHECKPOINT_LSN);
*offset = mach_read_from_4(cp_buf + LOG_CHECKPOINT_OFFSET);
/*对checkpoint魔法字进行校验*/
if (mach_read_from_4(cp_buf + LOG_CHECKPOINT_FSP_MAGIC_N) == LOG_CHECKPOINT_FSP_MAGIC_N_VAL) {
*fsp_limit = mach_read_from_4(cp_buf + LOG_CHECKPOINT_FSP_FREE_LIMIT);
if (*fsp_limit == 0) *fsp_limit = 1000000000;
}
else
*fsp_limit = 1000000000;
*cp_no = mach_read_from_8(cp_buf + LOG_CHECKPOINT_NO);
*first_header_lsn = mach_read_from_8(hdr + LOG_FILE_START_LSN);
return TRUE;
}
/*校验新老块格式的block合法性*/
static ibool log_block_checksum_is_ok_old_format(byte* block)
{
/*新格式*/
if (log_block_calc_checksum(block) == log_block_get_checksum(block))
return TRUE;
/*老格式*/
if(log_block_get_hdr_no(block) == log_block_get_checksum(block))
return TRUE;
return FALSE;
}
/*扫描一段log片段，返回有效block的n_byte_scanned长度和scanned_checkpoint_no*/
void recv_scan_log_seg_for_backup(byte* buf, ulint buf_len, dulint* scanned_lsn, ulint* scanned_checkpoint_no, ulint* n_byte_scanned)
{
ulint data_len;
byte* log_block;
ulint no;
*n_byte_scanned = 0;
for(log_block = buf; log_block < buf + buf_len; log_block += OS_FILE_LOG_BLOCK_SIZE){
no = log_block_get_hdr_no(log_block);
/*block no与scanned_lsn不相关联或者block不合法*/
if(no != log_block_convert_lsn_to_no(*scanned_lsn) || !log_block_checksum_is_ok_old_format(log_block)){
log_block += OS_FILE_LOG_BLOCK_SIZE;
break;
}
/*buf可能是最近log buffer刷盘产生的无效数据*/
if(*scanned_checkpoint_no > 0 && log_block_get_checkpoint_no(log_block) < *scanned_checkpoint_no
&& *scanned_checkpoint_no - log_block_get_checkpoint_no(log_block) > 0x80000000)
break;
data_len = log_block_get_data_len(log_block);
*scanned_checkpoint_no = log_block_get_checkpoint_no(log_block);
*scanned_lsn = ut_dulint_add(*scanned_lsn, data_len);
*n_byte_scanned = data_len;
if(data_len < OS_FILE_LOG_BLOCK_SIZE)
break;
}
}
/*恢复redo log中的操作*/
static byte* recv_parse_or_apply_log_rec_body(byte type, byte* ptr, byte* end_ptr, page_t* page, mtr_t* mtr)
{
byte* new_ptr;
/*进行各种mtr操作调用*/
if(type <= MLOG_8BYTES)
new_ptr = mlog_parse_nbytes(type, ptr, end_ptr, page);
else if (type == MLOG_REC_INSERT)
new_ptr = page_cur_parse_insert_rec(FALSE, ptr, end_ptr, page,mtr);
else if (type == MLOG_REC_CLUST_DELETE_MARK)
new_ptr = btr_cur_parse_del_mark_set_clust_rec(ptr, end_ptr,page);
else if (type == MLOG_REC_SEC_DELETE_MARK)
new_ptr = btr_cur_parse_del_mark_set_sec_rec(ptr, end_ptr, page);
else if (type == MLOG_REC_UPDATE_IN_PLACE)
new_ptr = btr_cur_parse_update_in_place(ptr, end_ptr, page);
else if ((type == MLOG_LIST_END_DELETE) || (type == MLOG_LIST_START_DELETE))
new_ptr = page_parse_delete_rec_list(type, ptr, end_ptr, page, mtr);
else if (type == MLOG_LIST_END_COPY_CREATED)
new_ptr = page_parse_copy_rec_list_to_created_page(ptr, end_ptr, page, mtr);
else if (type == MLOG_PAGE_REORGANIZE)
new_ptr = btr_parse_page_reorganize(ptr, end_ptr, page, mtr);
else if (type == MLOG_PAGE_CREATE)
new_ptr = page_parse_create(ptr, end_ptr, page, mtr);
else if (type == MLOG_UNDO_INSERT)
new_ptr = trx_undo_parse_add_undo_rec(ptr, end_ptr, page);
else if (type == MLOG_UNDO_ERASE_END)
new_ptr = trx_undo_parse_erase_page_end(ptr, end_ptr, page, mtr);
else if (type == MLOG_UNDO_INIT)
new_ptr = trx_undo_parse_page_init(ptr, end_ptr, page, mtr);
else if (type == MLOG_UNDO_HDR_DISCARD)
new_ptr = trx_undo_parse_discard_latest(ptr, end_ptr, page, mtr);
else if ((type == MLOG_UNDO_HDR_CREATE) || (type == MLOG_UNDO_HDR_REUSE))
new_ptr = trx_undo_parse_page_header(type, ptr, end_ptr, page, mtr);
else if (type == MLOG_REC_MIN_MARK)
new_ptr = btr_parse_set_min_rec_mark(ptr, end_ptr, page, mtr);
else if (type == MLOG_REC_DELETE)
new_ptr = page_cur_parse_delete_rec(ptr, end_ptr, page, mtr);
else if (type == MLOG_IBUF_BITMAP_INIT)
new_ptr = ibuf_parse_bitmap_init(ptr, end_ptr, page, mtr);
else if (type == MLOG_FULL_PAGE)
new_ptr = mtr_log_parse_full_page(ptr, end_ptr, page);
else if (type == MLOG_INIT_FILE_PAGE)
new_ptr = fsp_parse_init_file_page(ptr, end_ptr, page);
else if (type <= MLOG_WRITE_STRING)
new_ptr = mlog_parse_string(ptr, end_ptr, page);
else{
new_ptr = NULL;
recv_sys->found_corrupt_log = TRUE;
}
ut_ad(!page || new_ptr);
return new_ptr;
}
UNIV_INLINE ulint recv_fold(ulint space, ulint page_no)
{
return ut_fold_ulint_pair(space, page_no);
}
/*通过space 和page no在addr_hash中查找recv_addr*/
static recv_addr_t* recv_get_fil_addr_struct(ulint space, ulint page_no)
{
recv_addr_t* recv_addr;
recv_addr = HASH_GET_FIRST(recv_sys->addr_hash, recv_hash(space, page_no));
while(recv_addr){
/*相同的space和page no*/
if(recv_addr->space = space && recv_addr->page_no == page_no)
break;
recv_addr = HASH_GET_NEXT(addr_hash, recv_addr);
}
return recv_addr;
}
static void recv_add_to_hash_table(byte type, ulint space, ulint page_no, byte* body, byte* rec_end, dulint start_lsn, dulint end_lsn)
{
recv_t* recv;
ulint len;
recv_data_t* recv_data;
recv_data_t** prev_field;
recv_addr_t* recv_addr;
ut_a(space == 0);
len = rec_end = body;
recv = mem_heap_alloc(recv_sys->heap, sizeof(recv_t));
recv->type = type;
recv->len = rec_end - body;
recv->start_lsn = end_lsn;
/*hash table中没有这个单元，新建一个recv_addr,并将recv加入到其中*/
recv_addr = recv_get_fil_add_struct(space, page_no);
if(recv_addr == NULL){
recv_addr = mem_heap_alloc(recv_sys->heap, sizeof(recv_addr_t));
recv_addr->space = space;
recv_addr->page_no = page_no;
recv_addr->state = RECV_NOT_PROCESSED;
UT_LIST_INIT(recv_addr->rec_list);
HASH_INSERT(recv_addr_t, addr_hash, recv_sys->addr_hash, recv_fold(space, page_no), recv_addr);
}
UT_LIST_ADD_LAST(rec_list, recv_addr->rec_list, recv);
prev_field = &(recv->data);
while(rec_end > body){
len = rec_end - body;
if(len > RECV_DATA_BLOCK_SIZE)
len = RECV_DATA_BLOCK_SIZE;
recv_data = mem_heap_alloc(recv_sys->heap, sizeof(recv_data_t) + len);
*prev_field = recv_data;
/*将数据填补到recv_data的后面空间上*/
ut_memcpy(((byte*)recv_data) + sizeof(recv_data_t), body, len);
prev_field = &(recv_data->next);
body += len;
}
*prev_field = NULL;
}
/*从recv中将记录数据读取到buf当中*/
static void recv_data_copy_to_buf(byte* buf, recv_t* recv)
{
recv_data_t* recv_data;
ulint part_len;
ulint len;
len = recv->len;
recv_data = recv->data;
while(len > 0){
if(len > RECV_DATA_BLOCK_SIZE)
part_len = RECV_DATA_BLOCK_SIZE;
else
part_len = len;
ut_memcpy(buf, ((byte*)recv_data) + sizeof(recv_data_t), part_len);
buf += part_len;
len -= part_len;
recv_data = recv_data->next;
}
}
/*当page的LSN小于日志记录的LSN,将hash log中的记录写入到page当中*/
void recv_recover_page(ibool recover_backup, ibool just_read_in, page_t* page, ulint space, ulint page_no)
{
buf_block_t* block;
recv_addr_t* recv_addr;
recv_t* recv;
byte* buf;
dulint start_lsn;
dulint end_lsn;
dulint page_lsn;
dulint page_newest_lsn;
ibool modification_to_page;
ibool success;
mtr_t mtr;
mutex_enter(SYS_MUTEX);
if(recv_sys->apply_log_recs == FALSE){
mutex_exit(SYS_MUTEX);
return;
}
/*获得recv地址*/
recv_addr = recv_get_fil_addr_struct(space, page_no);
if(recv_addr == NULL || recv_addr->state == RECV_BEING_PROCESSED || recv_addr->state == RECV_PROCESSED){ /*recv_addr已经开始处理或者已经处理了*/
mutex_exit(SYS_MUTEX);
return;
}
/*更改recv_addr的状态，变成开始处理的状态*/
recv_addr->state = RECV_BEING_PROCESSED;
mutex_exit(SYS_MUTEX);
/*开始以一个mtr*/
mtr_start(&mtr);
mtr_set_log_mode(&mtr, MTR_LOG_NONE);
if(!recover_backup){
block = buf_block_align(page);
if(just_read_in) /*转移block->lock的归属线程*/
rw_lock_x_lock_move_ownership(&(block->lock));
success = buf_page_get_known_nowait(RW_X_LATCH, page, BUF_KEEP_OLD, IB__FILE__, __LINE__, &mtr);
ut_a(success);
buf_page_dbg_add_level(page, SYNC_NO_ORDER_CHECK);
}
/*获得page的lsn*/
page_lsn = mach_read_from_8(page + FIL_PAGE_LSN);
if (!recover_backup) {
page_newest_lsn = buf_frame_get_newest_modification(page);
if(!ut_dulint_is_zero(page_newest_lsn))
page_lsn = page_newest_lsn;
}
else
page_newest_lsn = ut_dulint_zero;
modification_to_page = FALSE;
recv = UT_LIST_GET_FIRST(recv_addr->rec_list);
while(recv){
end_lsn = recv->end_lsn;
/*从recv拷贝数据*/
if(recv->end_lsn > RECV_DATA_BLOCK_SIZE){
buf = mem_alloc(recv->len);
recv_data_copy_to_buf(buf, recv);
}
else
buf = ((byte*)recv->data) + sizeof(recv_data_t);
if(recv->type == MLOG_INIT_FILE_PAGE || recv->type == MLOG_FULL_PAGE){
page_lsn = page_newest_lsn;
mach_write_to_8(page + UNIV_PAGE_SIZE - FIL_PAGE_END_LSN, ut_dulint_zero);
mach_write_to_8(page + FIL_PAGE_LSN, ut_dulint_zero);
}
if (ut_dulint_cmp(recv->start_lsn, page_lsn) >= 0) {
if (!modification_to_page) {
modification_to_page = TRUE;
start_lsn = recv->start_lsn;
}
if (log_debug_writes)
fprintf(stderr, "InnoDB: Applying log rec type %lu len %lu to space %lu page no %lu\n",
(ulint)recv->type, recv->len, recv_addr->space, recv_addr->page_no);
/*进行mini transcation推演*/
recv_parse_or_apply_log_rec_body(recv->type, buf, buf + recv->len, page, &mtr);
/*修改page LSN*/
mach_write_to_8(page + UNIV_PAGE_SIZE - FIL_PAGE_END_LSN, ut_dulint_add(recv->start_lsn, recv->len));
mach_write_to_8(page + FIL_PAGE_LSN, ut_dulint_add(recv->start_lsn, recv->len));
}
if (recv->len > RECV_DATA_BLOCK_SIZE)
mem_free(buf);
recv = UT_LIST_GET_NEXT(rec_list, recv);
}
mutex_enter(SYS_MUTEX);
recv_addr->state = RECV_PROCESSED;
/*对hash cell的计数器进行-1,以便recv_apply_hashed_log_recs函数结束等待*/
ut_a(recv_sys->n_addrs);
recv_sys->n_addrs --;
mutex_exit(SYS_MUTEX);
if(!recover_backup && modification_to_page)
buf_flush_recv_note_modification(block, start_lsn, end_lsn);
mtr.modifications = FALSE;
mtr_commit(&mtr);
}
static ulint recv_read_in_area(ulint space, ulint page_no)
{
recv_addr_t* recv_addr;
ulint page_nos[RECV_READ_AHEAD_AREA];
ulint low_limit;
ulint n;
low_limit = page_no - (page_no % RECV_READ_AHEAD_AREA);
n = 0;
for (page_no = low_limit; page_no < low_limit + RECV_READ_AHEAD_AREA; page_no++) {
/*通过space和page_no获得recv_addr*/
recv_addr = recv_get_fil_addr_struct(space, page_no);
if (recv_addr && !buf_page_peek(space, page_no)) {
mutex_enter(&(recv_sys->mutex));
if (recv_addr->state == RECV_NOT_PROCESSED) { /*找到RECV_NOT_PROCESSED状态的recv_addr*/
recv_addr->state = RECV_BEING_READ;
page_nos[n] = page_no;
n++;
}
mutex_exit(&(recv_sys->mutex));
}
}
/*异步对页进行读取，并在buf_page_io_complete中做redo log恢复*/
buf_read_recv_pages(FALSE, space, page_nos, n);
return(n);
}
void recv_apply_hashed_log_recs(ibool allow_ibuf)
{
recv_addr_t* recv_addr;
page_t* page;
ulint i;
ulint space;
ulint page_no;
ulint n_pages;
ibool has_printed = FALSE;
mtr_t mtr;
loop:
mutex_enter(&(recv_sys->mutex));
if (recv_sys->apply_batch_on) {
mutex_exit(&(recv_sys->mutex));
os_thread_sleep(500000);
goto loop;
}
if (!allow_ibuf) {
ut_ad(mutex_own(&(log_sys->mutex)));
recv_no_ibuf_operations = TRUE;
}
else
ut_ad(!mutex_own(&(log_sys->mutex)));
/*标识正在批量应用日志*/
recv_sys->apply_log_recs = TRUE;
recv_sys->apply_batch_on = TRUE;
for (i = 0; i < hash_get_n_cells(recv_sys->addr_hash); i++) {
recv_addr = HASH_GET_FIRST(recv_sys->addr_hash, i);
while (recv_addr) {
space = recv_addr->space;
page_no = recv_addr->page_no;
if (recv_addr->state == RECV_NOT_PROCESSED) {
if (!has_printed) {
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: Starting an apply batch of log records to the database...\n"
"InnoDB: Progress in percents: ");
has_printed = TRUE;
}
mutex_exit(&(recv_sys->mutex));
if (buf_page_peek(space, page_no)) {
mtr_start(&mtr);
page = buf_page_get(space, page_no, RW_X_LATCH, &mtr);
buf_page_dbg_add_level(page, SYNC_NO_ORDER_CHECK);
/*将recv_addr_t上的log应用到对应的页上*/
recv_recover_page(FALSE, FALSE, page, space, page_no);
mtr_commit(&mtr);
}
else
recv_read_in_area(space, page_no);
mutex_enter(&(recv_sys->mutex));
}
recv_addr = HASH_GET_NEXT(addr_hash, recv_addr);
}
if (has_printed && (i * 100) / hash_get_n_cells(recv_sys->addr_hash) != ((i + 1) * 100) / hash_get_n_cells(recv_sys->addr_hash))
fprintf(stderr, "%lu ", (i * 100) / hash_get_n_cells(recv_sys->addr_hash));
}
/* Wait until all the pages have been processed */
while (recv_sys->n_addrs != 0) {
mutex_exit(&(recv_sys->mutex));
os_thread_sleep(500000);
mutex_enter(&(recv_sys->mutex));
}
if (has_printed)
fprintf(stderr, "\n");
if (!allow_ibuf) {
/* Flush all the file pages to disk and invalidate them in
the buffer pool */
mutex_exit(&(recv_sys->mutex));
mutex_exit(&(log_sys->mutex));
n_pages = buf_flush_batch(BUF_FLUSH_LIST, ULINT_MAX,
ut_dulint_max);
ut_a(n_pages != ULINT_UNDEFINED);
buf_flush_wait_batch_end(BUF_FLUSH_LIST);
buf_pool_invalidate();
mutex_enter(&(log_sys->mutex));
mutex_enter(&(recv_sys->mutex));
recv_no_ibuf_operations = FALSE;
}
recv_sys->apply_log_recs = FALSE;
recv_sys->apply_batch_on = FALSE;
/*对已经恢复的日志fil_addr记录做清空*/
recv_sys_empty_hash();
if (has_printed)
fprintf(stderr, "InnoDB: Apply batch completed\n");
mutex_exit(&(recv_sys->mutex));
}
void recv_apply_log_recs_for_backup(ulint n_data_files, char** data_files, ulint* file_sizes)
{
recv_addr_t* recv_addr;
os_file_t data_file;
ulint n_pages_total = 0;
ulint nth_file = 0;
ulint nth_page_in_file= 0;
byte* page;
ibool success;
ulint i;
recv_sys->apply_log_recs = TRUE;
recv_sys->apply_batch_on = TRUE;
page = buf_pool->frame_zero;
/*计算page总数*/
for(i = 0; i < n_data_files; i ++)
n_pages_total += file_sizes[i];
printf("InnoDB: Starting an apply batch of log records to the database...\n"
"InnoDB: Progress in percents: ");
for(i = 0; i < n_pages_total; i ++){
if(i == 0 || nth_page_in_file == file_sizes[nth_file]){
if(i != 0){
nth_file++;
nth_page_in_file = 0;
os_file_flush(data_file);
os_file_close(data_file);
}
data_file = os_file_create_simple(data_files[nth_file], OS_FILE_OPEN, OS_FILE_READ_WRITE, success);
if(!success){
printf("InnoDB: Error: cannot open %lu'th data file %s\n", nth_file);
exit(1);
}
}
/*获得recv_addr*/
recv_addr = recv_get_fil_addr_struct(0, i);
if(recv_addr != NULL){
/*从文件中读取一个page缓冲区数据*/
success = os_file_read(data_file, page, (nth_page_in_file << UNIV_PAGE_SIZE_SHIFT)
& 0xFFFFFFFF, nth_page_in_file >> (32 - UNIV_PAGE_SIZE_SHIFT), UNIV_PAGE_SIZE);
if(!success){
printf("InnoDB: Error: cannot write page no %lu to %lu'th data file %s\n",nth_page_in_file, nth_file);
exit(1);
}
buf_page_init_for_backup_restore(0, i, buf_block_align(page));
/*将recv_addr上的log应用到对应的页上*/
recv_recover_page(TRUE, FALSE, page, 0, i);
buf_flush_init_for_writing(page, mach_read_from_8(page + FIL_PAGE_LSN), 0, i);
success = os_file_write(data_files[nth_file],
data_file, page,
(nth_page_in_file << UNIV_PAGE_SIZE_SHIFT) & 0xFFFFFFFF,
nth_page_in_file >> (32 - UNIV_PAGE_SIZE_SHIFT),
UNIV_PAGE_SIZE);
}
if((100 * i) / n_pages_total != (100 * (i + 1)) / n_pages_total){
printf("%lu ", (100 * i) / n_pages_total);
fflush(stdout);
}
nth_page_in_file++;
}
os_file_flush(data_file);
os_file_close(data_file);
/*清空日志恢复的HASH TABLE*/
recv_sys_empty_hash();
}
static void recv_update_replicate(byte type, ulint space, ulint page_no, byte* body, byte* end_ptr)
{
page_t* replica;
mtr_t mtr;
byte* ptr;
mtr_start(&mtr);
mtr_set_log_mode(&mtr, MTR_LOG_NONE);
replica = buf_page_get(space + RECV_REPLICA_SPACE_ADD, page_no, RW_X_LATCH, &mtr);
buf_page_dbg_add_level(replica, SYNC_NO_ORDER_CHECK);
ptr = recv_parse_or_apply_log_rec_body(type, body, end_ptr, replica, &mtr);
ut_a(ptr == end_ptr);
buf_flush_recv_note_modification(buf_block_align(replica), log_sys->old_lsn, log_sys->old_lsn);
mtr.modifications = FASLE;
mtr_commit(&mtr);
}
static void recv_check_identical(byte* str1, byte* str2, ulint len)
{
ulint i;
for(i = 0; i < len; i ++){
if (str1[i] != str2[i]) {
fprintf(stderr, "Strings do not match at offset %lu\n", i);
ut_print_buf(str1 + i, 16);
fprintf(stderr, "\n");
ut_print_buf(str2 + i, 16);
ut_error;
}
}
}
static void recv_compare_relicate(ulint page, ulint page_no)
{
page_t* replica;
page_t* page;
mtr_t mtr;
mtr_start(&mtr);
mutex_enter(&(buf_pool->mutex));
page = buf_page_hash_get(space, page_no)->frame;
mutex_exit(&(buf_pool->mutex));
replica = buf_page_get(space + RECV_REPLICA_SPACE_ADD, page_no, RW_X_LATCH, &mtr);
buf_page_dbg_add_level(replica, SYNC_NO_ORDER_CHECK);
recv_check_identical(page + FIL_PAGE_DATA, replica + FIL_PAGE_DATA, PAGE_HEADER + PAGE_MAX_TRX_ID - FIL_PAGE_DATA);
recv_check_identical(page + PAGE_HEADER + PAGE_MAX_TRX_ID + 8,
replica + PAGE_HEADER + PAGE_MAX_TRX_ID + 8,
UNIV_PAGE_SIZE - FIL_PAGE_DATA_END - PAGE_HEADER - PAGE_MAX_TRX_ID - 8);
mtr_commit(&mtr);
}
void recv_compare_spaces(ulint space1, ulint space2, ulint n_pages)
{
page_t* replica;
page_t* page;
mtr_t mtr;
page_t* frame;
ulint page_no;
replica = buf_frame_alloc();
page = buf_frame_alloc();
for (page_no = 0; page_no < n_pages; page_no++) {
mtr_start(&mtr);
frame = buf_page_get_gen(space1, page_no, RW_S_LATCH, NULL,
BUF_GET_IF_IN_POOL,
IB__FILE__, __LINE__,
&mtr);
if (frame) {
buf_page_dbg_add_level(frame, SYNC_NO_ORDER_CHECK);
ut_memcpy(page, frame, UNIV_PAGE_SIZE);
} else {
/* Read it from file */
fil_io(OS_FILE_READ, TRUE, space1, page_no, 0, UNIV_PAGE_SIZE, page, NULL);
}
frame = buf_page_get_gen(space2, page_no, RW_S_LATCH, NULL, BUF_GET_IF_IN_POOL, IB__FILE__, __LINE__, &mtr);
if (frame) {
buf_page_dbg_add_level(frame, SYNC_NO_ORDER_CHECK);
ut_memcpy(replica, frame, UNIV_PAGE_SIZE);
} else {
/* Read it from file */
fil_io(OS_FILE_READ, TRUE, space2, page_no, 0, UNIV_PAGE_SIZE, replica, NULL);
}
recv_check_identical(page + FIL_PAGE_DATA, replica + FIL_PAGE_DATA, PAGE_HEADER + PAGE_MAX_TRX_ID - FIL_PAGE_DATA);
recv_check_identical(page + PAGE_HEADER + PAGE_MAX_TRX_ID + 8,
replica + PAGE_HEADER + PAGE_MAX_TRX_ID + 8,
UNIV_PAGE_SIZE - FIL_PAGE_DATA_END
- PAGE_HEADER - PAGE_MAX_TRX_ID - 8);