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InnoDB I/O and buffer pool interfaces and the redo log format have been changed between MariaDB 10.1 and 10.2, and the backup code has to be adjusted accordingly. The code has been simplified, and many memory leaks have been fixed. Instead of the file name xtrabackup_logfile, the file name ib_logfile0 is being used for the copy of the redo log. Unnecessary InnoDB startup and shutdown and some unnecessary threads have been removed. Some help was provided by Vladislav Vaintroub. Parameters have been cleaned up and aligned with those of MariaDB 10.2. The --dbug option has been added, so that in debug builds, --dbug=d,ib_log can be specified to enable diagnostic messages for processing redo log entries. By default, innodb_doublewrite=OFF, so that --prepare works faster. If more crash-safety for --prepare is needed, double buffering can be enabled. The parameter innodb_log_checksums=OFF can be used to ignore redo log checksums in --backup. Some messages have been cleaned up. Unless --export is specified, Mariabackup will not deal with undo log. The InnoDB mini-transaction redo log is not only about user-level transactions; it is actually about mini-transactions. To avoid confusion, call it the redo log, not transaction log. We disable any undo log processing in --prepare. Because MariaDB 10.2 supports indexed virtual columns, the undo log processing would need to be able to evaluate virtual column expressions. To reduce the amount of code dependencies, we will not process any undo log in prepare. This means that the --export option must be disabled for now. This also means that the following options are redundant and have been removed: xtrabackup --apply-log-only innobackupex --redo-only In addition to disabling any undo log processing, we will disable any further changes to data pages during --prepare, including the change buffer merge. This means that restoring incremental backups should reliably work even when change buffering is being used on the server. Because of this, preparing a backup will not generate any further redo log, and the redo log file can be safely deleted. (If the --export option is enabled in the future, it must generate redo log when processing undo logs and buffered changes.) In --prepare, we cannot easily know if a partial backup was used, especially when restoring a series of incremental backups. So, we simply warn about any missing files, and ignore the redo log for them. FIXME: Enable the --export option. FIXME: Improve the handling of the MLOG_INDEX_LOAD record, and write a test that initiates a backup while an ALGORITHM=INPLACE operation is creating indexes or rebuilding a table. An error should be detected when preparing the backup. FIXME: In --incremental --prepare, xtrabackup_apply_delta() should ensure that if FSP_SIZE is modified, the file size will be adjusted accordingly.
66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/******************************************************
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XtraBackup: hot backup tool for InnoDB
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(c) 2009-2012 Percona Inc.
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Originally Created 3/3/2009 Yasufumi Kinoshita
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Written by Alexey Kopytov, Aleksandr Kuzminsky, Stewart Smith, Vadim Tkachenko,
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Yasufumi Kinoshita, Ignacio Nin and Baron Schwartz.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*******************************************************/
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/* Data file read filter interface */
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#ifndef XB_READ_FILT_H
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#define XB_READ_FILT_H
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#include "changed_page_bitmap.h"
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typedef ulint space_id_t;
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struct xb_fil_cur_t;
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/* The read filter context */
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struct xb_read_filt_ctxt_t {
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ib_int64_t offset; /*!< current file offset */
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ib_int64_t data_file_size; /*!< data file size */
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size_t buffer_capacity;/*!< read buffer capacity */
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space_id_t space_id; /*!< space id */
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/* The following fields used only in bitmap filter */
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/* Move these to union if any other filters are added in future */
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xb_page_bitmap_range *bitmap_range; /*!< changed page bitmap range
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iterator for space_id */
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page_size_t page_size; /*!< page size */
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ulint filter_batch_end;/*!< the ending page id of the
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current changed page block in
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the bitmap */
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/** TODO: remove this default constructor */
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xb_read_filt_ctxt_t() : page_size(0) {}
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};
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/* The read filter */
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struct xb_read_filt_t {
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void (*init)(xb_read_filt_ctxt_t* ctxt,
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const xb_fil_cur_t* cursor,
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ulint space_id);
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void (*get_next_batch)(xb_read_filt_ctxt_t* ctxt,
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ib_int64_t* read_batch_start,
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ib_int64_t* read_batch_len);
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void (*deinit)(xb_read_filt_ctxt_t* ctxt);
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};
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extern xb_read_filt_t rf_pass_through;
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extern xb_read_filt_t rf_bitmap;
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#endif
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