At Percona, we operate on the premise that full-transparency makes a product better. We strive to build not only the best open-source database products but also to help you manage any issues that arise in any of the databases that we support. And, in true open-source form, report back on any issues or bugs you might encounter along the way.
We constantly update our bug reports and monitor other boards to ensure we have the latest information, but we wanted to make it a little easier for you to keep track of the most critical ones. This monthly post is a central place to get information on the most noteworthy open and recently resolved bugs.
In the July 2020 edition of our monthly bug report, we have the following list of bugs:
Percona Server for MySQL/MySQL Bugs
PS-7163(MySQL#99286):Concurrent update cause crash in row_search_mvcc
Affects Version/s: 5.7 [Tested/Reported version 5.7.29]
Concurrent update on a record (a combination of DELETE/INSERT and UPDATE ) could lead to this crash. This bug is critical since such operations are common for many database environments.
PS-6800(MySQL#98142): Uncontrollable memory allocation with TRIGGERS, PROCEDURES, and FUNCTIONS
Affects Version/s: 5.7,8.0 [Tested/Reported version 5.7.29, 8.0.19]
This is a critical bug because it will result in “Out Of Memory” for users who use routines extensively.
PS-7019(MySQL#99398): Correct query results for LEFT JOIN with GROUP BY
Affects Version/s: 8.0 [Tested/Reported version Upstream mysql# 8.0.20]
Fixed Version: PS-8.0.20 and MySQL-8.0.21
This bug is critical since it resulting in incorrect data.
PS-5641(MySQL#95863): Multithreaded slave replication deadlock when set super_read_only to ON
Affects Version/s: 5.7,8.0 [Tested/Reported version 5.7.26, 8.0.15]
Percona XtraDB Cluster
PXC-3248: PXC 8 crashes on startup when upgrading from 5.7
Affects Version/s: 8.0 [ Tested/Reported 8.0.18]
Source of this bug is PS-7057, where upgrade failed with a crash when innodb_track_changed_pages
PXC-3352: Unexpected ERROR 1205 modifying a child table in a FK relationship
Affects Version/s: 5.7 [Tested/Reported 5.7.28]
Affected users using foreign keys with PXC, When deleting/updating from a child table in a FK relationship, if a parent table has referenced row(s) locked, the operation on a child table will get locked and fail as soon as the parent table is unlocked. For UPDATE case, it’s important to touch a column, which is a part of a constraint.
Percona XtraBackup
PXB-2237: PXB crashes during backup when an encrypted table is updated
Affects Version/s: 2.4 [Tested/Reported version 2.4.20]
Databases with encrypted tables are affected by this bug. As a workaround, Taking backup in non-peak hours could avoid this crash.
PXB-2178: Restoring datadir from partial backup results in an inconsistent data dictionary
Affects Version/s: 8.0 [Tested/Reported version 8.0.11
Issue evident only in XtraBackup 8.0 due to new data dictionary implementation in MySQL 8.0 version, this issue is not reproducible with XtraBackup 2.4.
Percona Toolkit
PT-1859: pt-pg-summary fails for Postgres12
Affects Version/s: 3.2 [Tested/Reported version 3.2.0]
Fixed Version: 3.2.1
PT-1853: pt-online-schema-change doesn’t handle self-referencing foreign keys properly
Affects Version/s: 3.x [Tested/Reported version 3.2.0]
Affects who rebuild tables with a self-referencing foreign key.
Percona Monitoring and Management (PMM)
PMM-6153: PMM 2.7.0 inoperable when no Internet connectivity
Affects Version/s: 2.7 [Tested/Reported version 2.7.0]
Fixed Version: 2.8
This bug is critical since, If there is no external internet access on pmm-server docker container, then the Nginx process will keep restarting and pmm-client cannot communicate to pmm-server.
PMM-5823: pmm-server log download and api to get the version failed with timeout
Affects Version/s: 2.8 [Tested/Reported version 2.2]
Occurring at irregular intervals and only affected to pmm docker installation with no external internet access from pmm-server docker container. Critical for automated deployment of the PMM server because it will interrupt pmm-client and server communication for while after pmm server installation
Summary
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