MySQL 5.7并发复制隐式bug实例分析(2)-木庄网络博客

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Replication: A memory leak in mysqlbinlog was fixed. The leak happened when processing fake rotate events, or when using --raw and the destination log file could not be created. The leak only occurred when processing events from a remote server. Thanks to Laurynas Biveinis for his contribution to fixing this bug. (Bug #24323288, Bug #82283)

Replication: A slave server could lose events not yet applied when MASTER_AUTO_POSITION=0, both replication threads were stopped, and the applier delay was changed using CHANGE MASTER TO MASTER_DELAY=N. (Bug #23203678, Bug #81232)

References: See also: Bug #25340185, Bug #84375.

Replication: Transmission of large GCS messages could take so long the sender appeared to have died. (Bug #22671846)

Replication: Multithreaded slaves could not be configured with small queue sizes using slave_pending_jobs_size_max if they ever needed to process transactions larger than that size. Any packet larger than slave_pending_jobs_size_max was rejected with the error ER_MTS_EVENT_BIGGER_PENDING_JOBS_SIZE_MAX, even if the packet was smaller than the limit set by slave_max_allowed_packet.

With this fix, slave_pending_jobs_size_max becomes a soft limit rather than a hard limit. If the size of a packet exceeds slave_pending_jobs_size_max but is less than slave_max_allowed_packet, the transaction is held until all the slave workers have empty queues, and then processed. All subsequent transactions are held until the large transaction has been completed. The queue size for slave workers can therefore be limited while still allowing occasional larger transactions. (Bug #21280753, Bug #77406)

Replication: An incident event that broke replication was not written to the binary log with a GTID, so that it was not possible to skip the event using SET gtid_next=value. Instead, it was necessary to set the relay log file and relay log positions directly; this meant that, when autopositioning was enabled, it was necessary first to disable it, then to set the relay log file and position, and finally to re-enable autopositioning.

Now in such cases MySQL writes the incident event into the statement cache, so that a GTID is generated and written for it prior to flushing, and that the slave applier works with the change. Then users can skip the event using the SQL statement SET gtid_next=value, followed by BEGIN and COMMIT. (Bug #19594845)

Replication: In certain cases, the master could write to the binary log a last_committed value which was smaller than it should have been. This could cause the slave to execute in parallel transactions which should not have been, leading to inconsistencies or other errors. (Bug #84471, Bug #25379659)

Replication: When using group_replication_ip_whitelist=AUTOMATIC, IPs in the private network are permitted automatically, but some class C IP addresses were not being permitted correctly. (Bug #84329, Bug #25503458)

Replication: When an existing GTID_NEXT transaction was assigned a conflicting GTID by the server, Group Replication generated an assert upon detecting two transactions with same GTID. This was because Group Replication generates the GTID after conflict detection, which is later than with master/slave replication. The fix relaxes some conditions to only be called when commit is done and a message has been added to alert you when a GTID has already been used. (Bug #84153, Bug #25232042)

Replication: The replication applier thread returns Error 3002 ER_INCONSISTENT_ERROR when there is a difference between an expected error number and the actual error number. It is now possible to ignore this error by using 3002 with slave_skip_errors. (Bug #83186, Bug #24753281)

Replication: MySQL lost its GTID position following a restart when a dump from mysqldump had been used to load data.

To keep this problem from occurring, the mysql.gtid_executed table is now excluded automatically from dumps made by mysqldump. (Bug #82848, Bug #24590891)

References: See also: Bug #87455, Bug #26643180.

Replication: Corruption of relay logs for one channel in multi-source replication caused good channels not to be initalized during a server restart. In addition, when run with --skip-slave-start=false, the server also failed to start slave threads for those channels which were in good condition, despite the fact that it should have started the slave threads for all good channels.

Now, regardless of any errors on other channels, the server attempts to create and initialize channels that are in good condition, and starts slave threads for the good channels if --skip-slave-start is disabled. As part of this fix, START SLAVE and STOP SLAVE, which are intended to operate on all channels, are also modified such that they continue executing on all good channels even if they find bad channels among them. (Bug #82209, Bug #24285104)

Replication: The SQL thread was unable to GTID skip a partial transaction. (Bug #81119, Bug #25800025)

Debian client packages were missing information about conflicts with akonadi-backend-mysql packages. (Bug #26002288)

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