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log0log.cc
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/*****************************************************************************
Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2009, Google Inc.
Copyright (c) 2017, MariaDB Corporation. All Rights Reserved.
Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
briefly in the InnoDB documentation. The contributions by Google are
incorporated with their permission, and subject to the conditions contained in
the file COPYING.Google.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file log/log0log.cc
Database log
Created 12/9/1995 Heikki Tuuri
*******************************************************/
#include "log0log.h"
#ifdef UNIV_NONINL
#include "log0log.ic"
#endif
#ifndef UNIV_HOTBACKUP
#include "mem0mem.h"
#include "buf0buf.h"
#include "buf0flu.h"
#include "srv0srv.h"
#include "log0recv.h"
#include "fil0fil.h"
#include "dict0boot.h"
#include "srv0srv.h"
#include "srv0start.h"
#include "trx0sys.h"
#include "trx0trx.h"
#include "trx0roll.h"
#include "srv0mon.h"
/*
General philosophy of InnoDB redo-logs:
1) Every change to a contents of a data page must be done
through mtr, which in mtr_commit() writes log records
to the InnoDB redo log.
2) Normally these changes are performed using a mlog_write_ulint()
or similar function.
3) In some page level operations only a code number of a
c-function and its parameters are written to the log to
reduce the size of the log.
3a) You should not add parameters to these kind of functions
(e.g. trx_undo_header_create(), trx_undo_insert_header_reuse())
3b) You should not add such functionality which either change
working when compared with the old or are dependent on data
outside of the page. These kind of functions should implement
self-contained page transformation and it should be unchanged
if you don't have very essential reasons to change log
semantics or format.
*/
/* Global log system variable */
UNIV_INTERN log_t* log_sys = NULL;
#ifdef UNIV_PFS_RWLOCK
UNIV_INTERN mysql_pfs_key_t checkpoint_lock_key;
# ifdef UNIV_LOG_ARCHIVE
UNIV_INTERN mysql_pfs_key_t archive_lock_key;
# endif
#endif /* UNIV_PFS_RWLOCK */
#ifdef UNIV_PFS_MUTEX
UNIV_INTERN mysql_pfs_key_t log_sys_mutex_key;
UNIV_INTERN mysql_pfs_key_t log_flush_order_mutex_key;
#endif /* UNIV_PFS_MUTEX */
#ifdef UNIV_DEBUG
UNIV_INTERN ibool log_do_write = TRUE;
#endif /* UNIV_DEBUG */
/* These control how often we print warnings if the last checkpoint is too
old */
UNIV_INTERN ibool log_has_printed_chkp_warning = FALSE;
UNIV_INTERN time_t log_last_warning_time;
#ifdef UNIV_LOG_ARCHIVE
/* Pointer to this variable is used as the i/o-message when we do i/o to an
archive */
UNIV_INTERN byte log_archive_io;
#endif /* UNIV_LOG_ARCHIVE */
/* A margin for free space in the log buffer before a log entry is catenated */
#define LOG_BUF_WRITE_MARGIN (4 * OS_FILE_LOG_BLOCK_SIZE)
/* Margins for free space in the log buffer after a log entry is catenated */
#define LOG_BUF_FLUSH_RATIO 2
#define LOG_BUF_FLUSH_MARGIN (LOG_BUF_WRITE_MARGIN + 4 * UNIV_PAGE_SIZE)
/* Margin for the free space in the smallest log group, before a new query
step which modifies the database, is started */
#define LOG_CHECKPOINT_FREE_PER_THREAD (4 * UNIV_PAGE_SIZE)
#define LOG_CHECKPOINT_EXTRA_FREE (8 * UNIV_PAGE_SIZE)
/* This parameter controls asynchronous making of a new checkpoint; the value
should be bigger than LOG_POOL_PREFLUSH_RATIO_SYNC */
#define LOG_POOL_CHECKPOINT_RATIO_ASYNC 32
/* This parameter controls synchronous preflushing of modified buffer pages */
#define LOG_POOL_PREFLUSH_RATIO_SYNC 16
/* The same ratio for asynchronous preflushing; this value should be less than
the previous */
#define LOG_POOL_PREFLUSH_RATIO_ASYNC 8
/* Extra margin, in addition to one log file, used in archiving */
#define LOG_ARCHIVE_EXTRA_MARGIN (4 * UNIV_PAGE_SIZE)
/* This parameter controls asynchronous writing to the archive */
#define LOG_ARCHIVE_RATIO_ASYNC 16
/* Codes used in unlocking flush latches */
#define LOG_UNLOCK_NONE_FLUSHED_LOCK 1
#define LOG_UNLOCK_FLUSH_LOCK 2
/* States of an archiving operation */
#define LOG_ARCHIVE_READ 1
#define LOG_ARCHIVE_WRITE 2
/******************************************************//**
Completes a checkpoint write i/o to a log file. */
static
void
log_io_complete_checkpoint(void);
/*============================*/
#ifdef UNIV_LOG_ARCHIVE
/******************************************************//**
Completes an archiving i/o. */
static
void
log_io_complete_archive(void);
/*=========================*/
#endif /* UNIV_LOG_ARCHIVE */
/****************************************************************//**
Returns the oldest modified block lsn in the pool, or log_sys->lsn if none
exists.
@return LSN of oldest modification */
static
lsn_t
log_buf_pool_get_oldest_modification(void)
/*======================================*/
{
lsn_t lsn;
ut_ad(mutex_own(&(log_sys->mutex)));
lsn = buf_pool_get_oldest_modification();
if (!lsn) {
lsn = log_sys->lsn;
}
return(lsn);
}
/** Extends the log buffer.
@param[in] len requested minimum size in bytes */
static
void
log_buffer_extend(
ulint len)
{
ulint move_start;
ulint move_end;
byte tmp_buf[OS_FILE_LOG_BLOCK_SIZE];
mutex_enter(&(log_sys->mutex));
while (log_sys->is_extending) {
/* Another thread is trying to extend already.
Needs to wait for. */
mutex_exit(&(log_sys->mutex));
log_buffer_flush_to_disk();
mutex_enter(&(log_sys->mutex));
if (srv_log_buffer_size > len / UNIV_PAGE_SIZE) {
/* Already extended enough by the others */
mutex_exit(&(log_sys->mutex));
return;
}
}
log_sys->is_extending = true;
while (log_sys->n_pending_writes != 0
|| ut_calc_align_down(log_sys->buf_free,
OS_FILE_LOG_BLOCK_SIZE)
!= ut_calc_align_down(log_sys->buf_next_to_write,
OS_FILE_LOG_BLOCK_SIZE)) {
/* Buffer might have >1 blocks to write still. */
mutex_exit(&(log_sys->mutex));
log_buffer_flush_to_disk();
mutex_enter(&(log_sys->mutex));
}
move_start = ut_calc_align_down(
log_sys->buf_free,
OS_FILE_LOG_BLOCK_SIZE);
move_end = log_sys->buf_free;
/* store the last log block in buffer */
ut_memcpy(tmp_buf, log_sys->buf + move_start,
move_end - move_start);
log_sys->buf_free -= move_start;
log_sys->buf_next_to_write -= move_start;
/* reallocate log buffer */
srv_log_buffer_size = len / UNIV_PAGE_SIZE + 1;
mem_free(log_sys->buf_ptr);
log_sys->buf_ptr = static_cast<byte*>(
mem_zalloc(LOG_BUFFER_SIZE + OS_FILE_LOG_BLOCK_SIZE));
log_sys->buf = static_cast<byte*>(
ut_align(log_sys->buf_ptr, OS_FILE_LOG_BLOCK_SIZE));
log_sys->buf_size = LOG_BUFFER_SIZE;
log_sys->max_buf_free = log_sys->buf_size / LOG_BUF_FLUSH_RATIO
- LOG_BUF_FLUSH_MARGIN;
/* restore the last log block */
ut_memcpy(log_sys->buf, tmp_buf, move_end - move_start);
ut_ad(log_sys->is_extending);
log_sys->is_extending = false;
mutex_exit(&(log_sys->mutex));
ib_logf(IB_LOG_LEVEL_INFO,
"innodb_log_buffer_size was extended to %lu.",
LOG_BUFFER_SIZE);
}
/************************************************************//**
Opens the log for log_write_low. The log must be closed with log_close and
released with log_release.
@return start lsn of the log record */
UNIV_INTERN
lsn_t
log_reserve_and_open(
/*=================*/
ulint len) /*!< in: length of data to be catenated */
{
log_t* log = log_sys;
ulint len_upper_limit;
#ifdef UNIV_LOG_ARCHIVE
ulint archived_lsn_age;
ulint dummy;
#endif /* UNIV_LOG_ARCHIVE */
#ifdef UNIV_DEBUG
ulint count = 0;
#endif /* UNIV_DEBUG */
if (len >= log->buf_size / 2) {
DBUG_EXECUTE_IF("ib_log_buffer_is_short_crash",
DBUG_SUICIDE(););
/* log_buffer is too small. try to extend instead of crash. */
ib_logf(IB_LOG_LEVEL_WARN,
"The transaction log size is too large"
" for innodb_log_buffer_size (%lu >= %lu / 2). "
"Trying to extend it.",
len, LOG_BUFFER_SIZE);
log_buffer_extend((len + 1) * 2);
}
loop:
mutex_enter(&(log->mutex));
ut_ad(!recv_no_log_write);
if (log->is_extending) {
mutex_exit(&(log->mutex));
/* Log buffer size is extending. Writing up to the next block
should wait for the extending finished. */
os_thread_sleep(100000);
ut_ad(++count < 50);
goto loop;
}
/* Calculate an upper limit for the space the string may take in the
log buffer */
len_upper_limit = LOG_BUF_WRITE_MARGIN + (5 * len) / 4;
if (log->buf_free + len_upper_limit > log->buf_size) {
mutex_exit(&(log->mutex));
/* Not enough free space, do a syncronous flush of the log
buffer */
log_buffer_flush_to_disk();
srv_stats.log_waits.inc();
ut_ad(++count < 50);
goto loop;
}
#ifdef UNIV_LOG_ARCHIVE
if (log->archiving_state != LOG_ARCH_OFF) {
archived_lsn_age = log->lsn - log->archived_lsn;
if (archived_lsn_age + len_upper_limit
> log->max_archived_lsn_age) {
/* Not enough free archived space in log groups: do a
synchronous archive write batch: */
mutex_exit(&(log->mutex));
ut_ad(len_upper_limit <= log->max_archived_lsn_age);
log_archive_do(TRUE, &dummy);
ut_ad(++count < 50);
goto loop;
}
}
#endif /* UNIV_LOG_ARCHIVE */
#ifdef UNIV_LOG_DEBUG
log->old_buf_free = log->buf_free;
log->old_lsn = log->lsn;
#endif
return(log->lsn);
}
/************************************************************//**
Writes to the log the string given. It is assumed that the caller holds the
log mutex. */
UNIV_INTERN
void
log_write_low(
/*==========*/
byte* str, /*!< in: string */
ulint str_len) /*!< in: string length */
{
log_t* log = log_sys;
ulint len;
ulint data_len;
byte* log_block;
ut_ad(mutex_own(&(log->mutex)));
part_loop:
ut_ad(!recv_no_log_write);
/* Calculate a part length */
data_len = (log->buf_free % OS_FILE_LOG_BLOCK_SIZE) + str_len;
if (data_len <= OS_FILE_LOG_BLOCK_SIZE - LOG_BLOCK_TRL_SIZE) {
/* The string fits within the current log block */
len = str_len;
} else {
data_len = OS_FILE_LOG_BLOCK_SIZE - LOG_BLOCK_TRL_SIZE;
len = OS_FILE_LOG_BLOCK_SIZE
- (log->buf_free % OS_FILE_LOG_BLOCK_SIZE)
- LOG_BLOCK_TRL_SIZE;
}
ut_memcpy(log->buf + log->buf_free, str, len);
str_len -= len;
str = str + len;
log_block = static_cast<byte*>(
ut_align_down(
log->buf + log->buf_free, OS_FILE_LOG_BLOCK_SIZE));
log_block_set_data_len(log_block, data_len);
if (data_len == OS_FILE_LOG_BLOCK_SIZE - LOG_BLOCK_TRL_SIZE) {
/* This block became full */
log_block_set_data_len(log_block, OS_FILE_LOG_BLOCK_SIZE);
log_block_set_checkpoint_no(log_block,
log_sys->next_checkpoint_no);
len += LOG_BLOCK_HDR_SIZE + LOG_BLOCK_TRL_SIZE;
log->lsn += len;
/* Initialize the next block header */
log_block_init(log_block + OS_FILE_LOG_BLOCK_SIZE, log->lsn);
} else {
log->lsn += len;
}
log->buf_free += len;
ut_ad(log->buf_free <= log->buf_size);
if (str_len > 0) {
goto part_loop;
}
srv_stats.log_write_requests.inc();
}
/************************************************************//**
Closes the log.
@return lsn */
UNIV_INTERN
lsn_t
log_close(void)
/*===========*/
{
byte* log_block;
ulint first_rec_group;
lsn_t oldest_lsn;
lsn_t lsn;
log_t* log = log_sys;
lsn_t checkpoint_age;
ut_ad(mutex_own(&(log->mutex)));
ut_ad(!recv_no_log_write);
lsn = log->lsn;
log_block = static_cast<byte*>(
ut_align_down(
log->buf + log->buf_free, OS_FILE_LOG_BLOCK_SIZE));
first_rec_group = log_block_get_first_rec_group(log_block);
if (first_rec_group == 0) {
/* We initialized a new log block which was not written
full by the current mtr: the next mtr log record group
will start within this block at the offset data_len */
log_block_set_first_rec_group(
log_block, log_block_get_data_len(log_block));
}
if (log->buf_free > log->max_buf_free) {
log->check_flush_or_checkpoint = TRUE;
}
checkpoint_age = lsn - log->last_checkpoint_lsn;
if (checkpoint_age >= log->log_group_capacity) {
/* TODO: split btr_store_big_rec_extern_fields() into small
steps so that we can release all latches in the middle, and
call log_free_check() to ensure we never write over log written
after the latest checkpoint. In principle, we should split all
big_rec operations, but other operations are smaller. */
if (!log_has_printed_chkp_warning
|| difftime(time(NULL), log_last_warning_time) > 15) {
log_has_printed_chkp_warning = TRUE;
log_last_warning_time = time(NULL);
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: ERROR: the age of the last"
" checkpoint is " LSN_PF ",\n"
"InnoDB: which exceeds the log group"
" capacity " LSN_PF ".\n"
"InnoDB: If you are using big"
" BLOB or TEXT rows, you must set the\n"
"InnoDB: combined size of log files"
" at least 10 times bigger than the\n"
"InnoDB: largest such row.\n",
checkpoint_age,
log->log_group_capacity);
}
}
if (checkpoint_age <= log->max_modified_age_sync) {
goto function_exit;
}
oldest_lsn = buf_pool_get_oldest_modification();
if (!oldest_lsn
|| lsn - oldest_lsn > log->max_modified_age_sync
|| checkpoint_age > log->max_checkpoint_age_async) {
log->check_flush_or_checkpoint = TRUE;
}
function_exit:
#ifdef UNIV_LOG_DEBUG
log_check_log_recs(log->buf + log->old_buf_free,
log->buf_free - log->old_buf_free, log->old_lsn);
#endif
return(lsn);
}
#ifdef UNIV_LOG_ARCHIVE
/******************************************************//**
Pads the current log block full with dummy log records. Used in producing
consistent archived log files. */
static
void
log_pad_current_log_block(void)
/*===========================*/
{
byte b = MLOG_DUMMY_RECORD;
ulint pad_length;
ulint i;
ib_uint64_t lsn;
/* We retrieve lsn only because otherwise gcc crashed on HP-UX */
lsn = log_reserve_and_open(OS_FILE_LOG_BLOCK_SIZE);
pad_length = OS_FILE_LOG_BLOCK_SIZE
- (log_sys->buf_free % OS_FILE_LOG_BLOCK_SIZE)
- LOG_BLOCK_TRL_SIZE;
for (i = 0; i < pad_length; i++) {
log_write_low(&b, 1);
}
lsn = log_sys->lsn;
log_close();
log_release();
ut_a(lsn % OS_FILE_LOG_BLOCK_SIZE == LOG_BLOCK_HDR_SIZE);
}
#endif /* UNIV_LOG_ARCHIVE */
/******************************************************//**
Calculates the data capacity of a log group, when the log file headers are not
included.
@return capacity in bytes */
UNIV_INTERN
lsn_t
log_group_get_capacity(
/*===================*/
const log_group_t* group) /*!< in: log group */
{
ut_ad(mutex_own(&(log_sys->mutex)));
return((group->file_size - LOG_FILE_HDR_SIZE) * group->n_files);
}
/******************************************************//**
Calculates the offset within a log group, when the log file headers are not
included.
@return size offset (<= offset) */
UNIV_INLINE
lsn_t
log_group_calc_size_offset(
/*=======================*/
lsn_t offset, /*!< in: real offset within the
log group */
const log_group_t* group) /*!< in: log group */
{
ut_ad(mutex_own(&(log_sys->mutex)));
return(offset - LOG_FILE_HDR_SIZE * (1 + offset / group->file_size));
}
/******************************************************//**
Calculates the offset within a log group, when the log file headers are
included.
@return real offset (>= offset) */
UNIV_INLINE
lsn_t
log_group_calc_real_offset(
/*=======================*/
lsn_t offset, /*!< in: size offset within the
log group */
const log_group_t* group) /*!< in: log group */
{
ut_ad(mutex_own(&(log_sys->mutex)));
return(offset + LOG_FILE_HDR_SIZE
* (1 + offset / (group->file_size - LOG_FILE_HDR_SIZE)));
}
/******************************************************//**
Calculates the offset of an lsn within a log group.
@return offset within the log group */
static
lsn_t
log_group_calc_lsn_offset(
/*======================*/
lsn_t lsn, /*!< in: lsn */
const log_group_t* group) /*!< in: log group */
{
lsn_t gr_lsn;
lsn_t gr_lsn_size_offset;
lsn_t difference;
lsn_t group_size;
lsn_t offset;
ut_ad(mutex_own(&(log_sys->mutex)));
gr_lsn = group->lsn;
gr_lsn_size_offset = log_group_calc_size_offset(group->lsn_offset, group);
group_size = log_group_get_capacity(group);
if (lsn >= gr_lsn) {
difference = lsn - gr_lsn;
} else {
difference = gr_lsn - lsn;
difference = difference % group_size;
difference = group_size - difference;
}
offset = (gr_lsn_size_offset + difference) % group_size;
/* fprintf(stderr,
"Offset is " LSN_PF " gr_lsn_offset is " LSN_PF
" difference is " LSN_PF "\n",
offset, gr_lsn_size_offset, difference);
*/
return(log_group_calc_real_offset(offset, group));
}
#endif /* !UNIV_HOTBACKUP */
#ifdef UNIV_DEBUG
UNIV_INTERN ibool log_debug_writes = FALSE;
#endif /* UNIV_DEBUG */
/*******************************************************************//**
Calculates where in log files we find a specified lsn.
@return log file number */
UNIV_INTERN
ulint
log_calc_where_lsn_is(
/*==================*/
ib_int64_t* log_file_offset, /*!< out: offset in that file
(including the header) */
ib_uint64_t first_header_lsn, /*!< in: first log file start
lsn */
ib_uint64_t lsn, /*!< in: lsn whose position to
determine */
ulint n_log_files, /*!< in: total number of log
files */
ib_int64_t log_file_size) /*!< in: log file size
(including the header) */
{
ib_int64_t capacity = log_file_size - LOG_FILE_HDR_SIZE;
ulint file_no;
ib_int64_t add_this_many;
if (lsn < first_header_lsn) {
add_this_many = 1 + (first_header_lsn - lsn)
/ (capacity * (ib_int64_t) n_log_files);
lsn += add_this_many
* capacity * (ib_int64_t) n_log_files;
}
ut_a(lsn >= first_header_lsn);
file_no = ((ulint)((lsn - first_header_lsn) / capacity))
% n_log_files;
*log_file_offset = (lsn - first_header_lsn) % capacity;
*log_file_offset = *log_file_offset + LOG_FILE_HDR_SIZE;
return(file_no);
}
#ifndef UNIV_HOTBACKUP
/********************************************************//**
Sets the field values in group to correspond to a given lsn. For this function
to work, the values must already be correctly initialized to correspond to
some lsn, for instance, a checkpoint lsn. */
UNIV_INTERN
void
log_group_set_fields(
/*=================*/
log_group_t* group, /*!< in/out: group */
lsn_t lsn) /*!< in: lsn for which the values should be
set */
{
group->lsn_offset = log_group_calc_lsn_offset(lsn, group);
group->lsn = lsn;
}
/*****************************************************************//**
Calculates the recommended highest values for lsn - last_checkpoint_lsn,
lsn - buf_get_oldest_modification(), and lsn - max_archive_lsn_age.
@return error value FALSE if the smallest log group is too small to
accommodate the number of OS threads in the database server */
static
ibool
log_calc_max_ages(void)
/*===================*/
{
log_group_t* group;
lsn_t margin;
ulint free;
ibool success = TRUE;
lsn_t smallest_capacity;
lsn_t archive_margin;
lsn_t smallest_archive_margin;
mutex_enter(&(log_sys->mutex));
group = UT_LIST_GET_FIRST(log_sys->log_groups);
ut_ad(group);
smallest_capacity = LSN_MAX;
smallest_archive_margin = LSN_MAX;
while (group) {
if (log_group_get_capacity(group) < smallest_capacity) {
smallest_capacity = log_group_get_capacity(group);
}
archive_margin = log_group_get_capacity(group)
- (group->file_size - LOG_FILE_HDR_SIZE)
- LOG_ARCHIVE_EXTRA_MARGIN;
if (archive_margin < smallest_archive_margin) {
smallest_archive_margin = archive_margin;
}
group = UT_LIST_GET_NEXT(log_groups, group);
}
/* Add extra safety */
smallest_capacity = smallest_capacity - smallest_capacity / 10;
/* For each OS thread we must reserve so much free space in the
smallest log group that it can accommodate the log entries produced
by single query steps: running out of free log space is a serious
system error which requires rebooting the database. */
free = LOG_CHECKPOINT_FREE_PER_THREAD * (10 + srv_thread_concurrency)
+ LOG_CHECKPOINT_EXTRA_FREE;
if (free >= smallest_capacity / 2) {
success = FALSE;
goto failure;
} else {
margin = smallest_capacity - free;
}
margin = margin - margin / 10; /* Add still some extra safety */
log_sys->log_group_capacity = smallest_capacity;
log_sys->max_modified_age_async = margin
- margin / LOG_POOL_PREFLUSH_RATIO_ASYNC;
log_sys->max_modified_age_sync = margin
- margin / LOG_POOL_PREFLUSH_RATIO_SYNC;
log_sys->max_checkpoint_age_async = margin - margin
/ LOG_POOL_CHECKPOINT_RATIO_ASYNC;
log_sys->max_checkpoint_age = margin;
#ifdef UNIV_LOG_ARCHIVE
log_sys->max_archived_lsn_age = smallest_archive_margin;
log_sys->max_archived_lsn_age_async = smallest_archive_margin
- smallest_archive_margin / LOG_ARCHIVE_RATIO_ASYNC;
#endif /* UNIV_LOG_ARCHIVE */
failure:
mutex_exit(&(log_sys->mutex));
if (!success) {
fprintf(stderr,
"InnoDB: Error: ib_logfiles are too small"
" for innodb_thread_concurrency %lu.\n"
"InnoDB: The combined size of ib_logfiles"
" should be bigger than\n"
"InnoDB: 200 kB * innodb_thread_concurrency.\n"
"InnoDB: To get mysqld to start up, set"
" innodb_thread_concurrency in my.cnf\n"
"InnoDB: to a lower value, for example, to 8."
" After an ERROR-FREE shutdown\n"
"InnoDB: of mysqld you can adjust the size of"
" ib_logfiles, as explained in\n"
"InnoDB: " REFMAN "adding-and-removing.html\n"
"InnoDB: Cannot continue operation."
" Calling exit(1).\n",
(ulong) srv_thread_concurrency);
exit(1);
}
return(success);
}
/******************************************************//**
Initializes the log. */
UNIV_INTERN
void
log_init(void)
/*==========*/
{
log_sys = static_cast<log_t*>(mem_alloc(sizeof(log_t)));
mutex_create(log_sys_mutex_key, &log_sys->mutex, SYNC_LOG);
mutex_create(log_flush_order_mutex_key,
&log_sys->log_flush_order_mutex,
SYNC_LOG_FLUSH_ORDER);
mutex_enter(&(log_sys->mutex));
/* Start the lsn from one log block from zero: this way every
log record has a start lsn != zero, a fact which we will use */
log_sys->lsn = LOG_START_LSN;
ut_a(LOG_BUFFER_SIZE >= 16 * OS_FILE_LOG_BLOCK_SIZE);
ut_a(LOG_BUFFER_SIZE >= 4 * UNIV_PAGE_SIZE);
log_sys->buf_ptr = static_cast<byte*>(
mem_zalloc(LOG_BUFFER_SIZE + OS_FILE_LOG_BLOCK_SIZE));
log_sys->buf = static_cast<byte*>(
ut_align(log_sys->buf_ptr, OS_FILE_LOG_BLOCK_SIZE));
log_sys->buf_size = LOG_BUFFER_SIZE;
log_sys->is_extending = false;
log_sys->max_buf_free = log_sys->buf_size / LOG_BUF_FLUSH_RATIO
- LOG_BUF_FLUSH_MARGIN;
log_sys->check_flush_or_checkpoint = TRUE;
UT_LIST_INIT(log_sys->log_groups);
log_sys->n_log_ios = 0;
log_sys->n_log_ios_old = log_sys->n_log_ios;
log_sys->last_printout_time = time(NULL);
/*----------------------------*/
log_sys->buf_next_to_write = 0;
log_sys->write_lsn = 0;
log_sys->current_flush_lsn = 0;
log_sys->flushed_to_disk_lsn = 0;
log_sys->written_to_some_lsn = log_sys->lsn;
log_sys->written_to_all_lsn = log_sys->lsn;
log_sys->n_pending_writes = 0;
log_sys->no_flush_event = os_event_create();
os_event_set(log_sys->no_flush_event);
log_sys->one_flushed_event = os_event_create();
os_event_set(log_sys->one_flushed_event);
/*----------------------------*/
log_sys->next_checkpoint_no = 0;
log_sys->last_checkpoint_lsn = log_sys->lsn;
log_sys->n_pending_checkpoint_writes = 0;
rw_lock_create(checkpoint_lock_key, &log_sys->checkpoint_lock,
SYNC_NO_ORDER_CHECK);
log_sys->checkpoint_buf_ptr = static_cast<byte*>(
mem_zalloc(2 * OS_FILE_LOG_BLOCK_SIZE));
log_sys->checkpoint_buf = static_cast<byte*>(
ut_align(log_sys->checkpoint_buf_ptr, OS_FILE_LOG_BLOCK_SIZE));
/*----------------------------*/
#ifdef UNIV_LOG_ARCHIVE
/* Under MySQL, log archiving is always off */
log_sys->archiving_state = LOG_ARCH_OFF;
log_sys->archived_lsn = log_sys->lsn;
log_sys->next_archived_lsn = 0;
log_sys->n_pending_archive_ios = 0;
rw_lock_create(archive_lock_key, &log_sys->archive_lock,
SYNC_NO_ORDER_CHECK);
log_sys->archive_buf = NULL;
/* ut_align(
ut_malloc(LOG_ARCHIVE_BUF_SIZE
+ OS_FILE_LOG_BLOCK_SIZE),
OS_FILE_LOG_BLOCK_SIZE); */
log_sys->archive_buf_size = 0;
/* memset(log_sys->archive_buf, '\0', LOG_ARCHIVE_BUF_SIZE); */
log_sys->archiving_on = os_event_create();
#endif /* UNIV_LOG_ARCHIVE */
/*----------------------------*/
log_block_init(log_sys->buf, log_sys->lsn);
log_block_set_first_rec_group(log_sys->buf, LOG_BLOCK_HDR_SIZE);
log_sys->buf_free = LOG_BLOCK_HDR_SIZE;
log_sys->lsn = LOG_START_LSN + LOG_BLOCK_HDR_SIZE;
MONITOR_SET(MONITOR_LSN_CHECKPOINT_AGE,
log_sys->lsn - log_sys->last_checkpoint_lsn);
mutex_exit(&(log_sys->mutex));
#ifdef UNIV_LOG_DEBUG
recv_sys_create();
recv_sys_init(buf_pool_get_curr_size());
recv_sys->parse_start_lsn = log_sys->lsn;
recv_sys->scanned_lsn = log_sys->lsn;
recv_sys->scanned_checkpoint_no = 0;
recv_sys->recovered_lsn = log_sys->lsn;
recv_sys->limit_lsn = LSN_MAX;
#endif
}
/******************************************************************//**
Inits a log group to the log system. */
UNIV_INTERN
void
log_group_init(
/*===========*/
ulint id, /*!< in: group id */
ulint n_files, /*!< in: number of log files */
lsn_t file_size, /*!< in: log file size in bytes */
ulint space_id, /*!< in: space id of the file space
which contains the log files of this
group */
ulint archive_space_id MY_ATTRIBUTE((unused)))
/*!< in: space id of the file space
which contains some archived log
files for this group; currently, only
for the first log group this is
used */
{
ulint i;
log_group_t* group;
group = static_cast<log_group_t*>(mem_alloc(sizeof(log_group_t)));
group->id = id;
group->n_files = n_files;
group->file_size = file_size;
group->space_id = space_id;
group->state = LOG_GROUP_OK;
group->lsn = LOG_START_LSN;
group->lsn_offset = LOG_FILE_HDR_SIZE;
group->n_pending_writes = 0;