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MySQL Enterprise Backup 3.12.4 has been released




Dear MySQL users,

MySQL Enterprise Backup v3.12.4, a new version of the online MySQL backup
tool, is now available for download from the My Oracle Support (MOS) website
as our latest GA release. This release will be available on eDelivery (OSDC)
after the next upload cycle. MySQL Enterprise Backup is a commercial
extension to the MySQL family of products.

A brief summary of the changes in MySQL Enterprise Backup (MEB)
version 3.12.4 is given below.

Changes in MySQL Enterprise Backup 3.12.4 (2019-02-15)

     * Functionality Added or Changed

     * Bugs Fixed

Functionality Added or Changed


     * Information on the executed GTIDs is now includfed in the
       mysqlbackup output and the backup log when the backed-up
       server has GTIDs enabled. (Bug #25978803)

     * A backup became corrupted if, during the backup process,
       a DDL operation that took advantage of MySQL server's
       online DDL feature
       (http://dev.mysql.com/doc/refman/5.6/en/innodb-online-ddl.html)
       occurred. This was because mysqlbackup did not
       support the server feature---and it still does not. This
       fix avoids the error by having mysqlbackup turn the
       server's system variable old_alter_table to "1" at the
       beginning of a backup if it is "0," so that any DDL
       operations that take place during the backup are handled
       with the old table copy method. mysqlbackup then turns
       the variable back to "0" near the end of the backup
       operation.
       Important
       Notice that in cases where mysqlbackup quits unexpectedly
       and does not turn old_alter_table back to its original
       value, the user will have to turn the value back to "0"
       manually on the server, in order to return the server to
       its original configuration. This should be performed if
       the statement "Server system variable 'old_alter_table'
       was set to '0'. Setting it to '1'" appears in the early
       output of mysqlbackup, but the statement "Setting server
       system variable 'old_alter_table' back to '0'" does not
       appear before mysqlbackup quits.
       (Bug #25217215)

     * A new option, --skip-final-rescan, makes mysqlbackup skip
       the final rescan for InnoDB tables that are modified by
       DDL operations after the database has been locked near
       the end of a backup operation. This potentially shortens
       the duration for the lock and reduces the backup's impact
       on the server's normal operation. See the description for
       --skip-final-rescan for details. (Bug #21094221)

     * The output by mysqlbackup, which goes to the stderr
       stream and the message log, has now been improved to
       include the timestamps and thread IDs for all steps taken
       by mysqlbackup, in order to provide more information for
       debugging purposes. (Bug #20142619)

     * When there were no tables matching the regular expression
       specified with the --include-tables option during a
       backup operation, mysqlbackup still created a backup,
       which contained an empty folder for each database on the
       server. mysqlbackup now throws an error when
       --include-tables selects no tables to be backed up. (Bug
       #18114353)

     * During the final stage of a backup when MySQL Enterprise
       Backup tried to temporarily put the database into a
       read-only state using the FLUSH TABLES WITH READ LOCK
       statement in order to copy non-InnoDB files, if a long
       query was running on the server at the same time, the
       FLUSH TABLES WITH READ LOCK statement could be taking too
       long to finish, holding up further queries and eventually
       bringing down the server.
       A new mysqlbackup option --lock-wait-timeout can now be
       used to specify the timeout in seconds for the FLUSH
       TABLES WITH READ LOCK statement. If the timeout is
       exceeded, the statement is failed and the lock on the
       tables is released, so that queries held up by the lock
       can then be executed. mysqlbackup then retries the
       statement and continues with the backup. Default value
       for --lock-wait-timeout is 60 [seconds]. (Bug #14339483)

     * In order to minimize the impact of a hot backup on the
       MySQL server, the copying of the buffer pool dump files
       and some of the metadata files is now performed before
       the final phase of the backup in which the server
       instance is locked. This shortens the duration for the
       lock and reduces the backup's impact on the server's
       normal operation.
       Also, to minimize the resource used on a backup, the
       copying of the buffer pool dump files is no longer
       performed for partial and offline backups, for which the
       buffer pool dump is usually not very useful.

Bugs Fixed


     * While MySQL Server interprets the system variable setting
       --innodb_checksum_algorithm=0 to mean
       --innodb_checksum_algorithm=crc32, a mysqlbackup
       operation (except for backup) failed when
       --innodb_checksum_algorithm=0 was set as a configuration
       option. With this fix, mysqlbackup now accepts
       --innodb_checksum_algorithm=0 as valid and interprets it
       as --innodb_checksum_algorithm=crc32. (Bug #28295519)

     * On macOS, mysqlbackup failed to determine the relay log
       file name correctly if the relay log index file name was
       not specified. (Bug #25574605)

     * The Release number for the RPM packages of MySQL
       Enterprise Backup always said "1," instead of giving the
       release number of the Linux distribution for which the
       package was built. (Bug #25538798)

     * When the option --only-innodb-with-frm or --no-locking
       was used during a backup operation, the backup sometimes
       failed with mysqlbackup complaining that the highest LSN
       was larger in a copied page than on the backed-up server.
       It was because mysqlbackup did not perform a log flushing
       before copying the redo log when either of the mentioned
       options was used. With this fix, log flushing was always
       performed to prevent the error. (Bug #25412655)

     * When creating a full image backup with the --no-locking
       option, mysqlbackup failed to write the binary log
       information to the backup history table and the
       backup_variables.txt file. The result was that when
       creating an incremental image backup based on the full
       backup, the attempt to copy the binary log files from the
       server into the incremental image backup (which is the
       default behavior) would fail, causing the incremental
       backup to stop. With this fix, the binary log information
       is no longer missing after the full backup, so the
       incremental image backup no longer fails." (Bug
       #25296324)
       References: See also: Bug #19915713.

     * After restoring an incremental backup of a slave server,
       the file ibbackup_slave_info was missing from the meta
       folder under the backup directory on the target server.
       (Bug #25097753)

     * mysqlbackup logged double entries with wrong information
       into the backup_history table for optimistic backups.
       (Bug #24502876)

     * Backups for a slave server in a multi-source replication
       setup using the --slave-info option failed. (Bug
       #24444950)
       References: See also: Bug #21830316.

     * Attempts to restore an image backup from the cloud using
       the --skip-binlog option failed with a "global tail magic
       mismatch" error. This was because mysqlbackup failed to
       perform a non-sequential read from the cloud with gaps
       caused by the skipping of the binary logs. This fix makes
       sure mysqlbackup can perform such reads. (Bug #23534700)

     * An extract operation for an image backup failed with a
       checksum mismatch error in cases when, during the backup,
       an InnoDB tablespace file kept growing in size, and
       mysqlbackup failed to put the correct file size in its
       file header. (Bug #22905984)
       References: This issue is a regression of: Bug #22613568.

     * After an apply-incremental-backup operation on a full
       backup, mysqlbackup printed to the output stream and the
       message log file the old instead of the updated binary
       log position. (Bug #22085034, Bug #78898)

     * When running the backup-and-apply-log command without a
       connection to the MySQL server, mysqlbackup could not
       know the correct binary log file name and binary log
       position for the backup; yet, at the end of the
       backup-and-apply-log operation, mysqlbackup still printed
       out some values for the binary log file name and
       position, which were random in nature. (Bug #21623089)

     * Occasionally, some files were missing from an image
       backup created by the --backup-to-image command. It was
       due to an internal race condition, which this fix
       eliminates. (Bug #19600687)

On Behalf of MySQL Release Engineering Team,
Surabhi Bhat