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Displaying posts with tag: speculations (reset)
Fun with Bugs #81 - On MySQL Bug Reports I am Subscribed to, Part XVII

Two weeks passed since my previous review of public MySQL bug reports I consider interesting enough to subscribe to them. Over this period I picked up a dozen or so new public bug reports that I'd like to briefly review today.

Here is my recent subscriptions list, starting from the oldest bug reports:

  • Bug #94431 - "Can't upgrade from 5.7 to 8.0 if any database have a hyphen in their name". It seems one actually needs a database like that created in MySQL 5.6 with at least one InnoDB table having FULLTEXT index to hit the problem. Great finding by Phil Murray. Note that after several unsuccessful attempts by others the bug was eventually reproduced and verified by …
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Fun with Bugs #80 - On MySQL Bug Reports I am Subscribed to, Part XVI

Today I'd like to continue my review of public MySQL bug reports with a list of some bugs I've subscribed to over last 3 weeks. It's already long enough and includes nice cases to check and share. Note that I usually subscribe to a bug either because it directly affects me or customers I work with, or I consider it technically interesting (so I mostly care about InnoDB, replication, partitioning and optimizer bugs), or it's a "metabug" - a problem in the way public bug report is handled by Oracle engineers. These are my interests related to MySQL bugs.

As usual, I start with the oldest bugs and try to mention bug reporters by name with links to their other reports whenever this may give something useful to a reader. I try …

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Fun with Bugs #79 - On MySQL Bug Reports I am Subscribed to, Part XV

More than 3 weeks passed since my previous review of public MySQL bug reports I am subscribed to, so it's time to present some of the bugs I've considered interesting in January, 2019.

As usual, I'll review them starting from the oldest and try to summarize my feelings about these bugs at the end of this post. Here they are:

  • Bug #93806 - "Document error about ON DUPLICATE KEY UPDATE". Years pass, but fine MySQL manual still does not explain some cases of InnoDB locking properly. Xiaobin Lin found yet another case that it does not explain properly. Or, maybe, the manual is correct and the problem in …
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Fun with Bugs #78 - On Some Public Bugs Fixed in MySQL 5.7.25

Today I'd like to continue my tradition of ignoring MySQL 8 (after all, I can not even build 8.0.14 any more on my Ubuntu 14.04, it's not supported suddenly because of old gcc version) and, of all MySQL server versions released by Oracle this week, concentrate on bugs reported in public bugs database and fixed in the latest minor release of MySQL 5.7 branch, 5.7.25.

This time there is only one InnoDB community-reported bug fixed, Buig #87423 - "os0file.cc assertion failed 'offset > 0' in os_file_io_complete", from Vasily Nemkov. See also it's duplicate, …

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Fun with Bugs #77 - On MySQL Bug Reports I am Subscribed to, Part XIV

Slides for my talk about MySQL bugs at FOSDEM 2019 MySQL, MariaDB and Friends Devroon are ready, support customers decided not to break anything badly on weekend, so I have some free time for blogging.  As usual, when I do not have any better idea or useful recent real life experience to share I write about MySQL bugs.

Today I'd like to continue my review of interesting MySQL bug reports added by Community members in December, 2018. I'll review them starting from the oldest:

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Fun with Bugs #76 - On MySQL Bug Reports I am Subscribed to, Part XIII

Holidays season is almost over here, so it's time to get back to my main topic of MySQL bugs. Proper MySQL bug reporting will be a topic of my FOSDEM 2019 talk in less than 4 weeks (and few slides with recent examples of bugs are not yet ready), so I have to concentrate on bugs.

Last time in this series I reviewed some interesting bug reports filed in November, 2018. Time to move on and proceed with bugs reported in December, 2018, as I've subscribed to 27 or so of them. As usual, I'll review them briefly starting from the oldest and try to check if MariaDB 10.3 is also affected when the bug report is about common features:

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MariaDB JIRA for MySQL DBAs

These days several kinds and forks of MySQL are widely used, and while I promised not to write about MySQL bugs till the end of 2018, I think it makes sense to try to explain basic details about bug reporting for at least one of vendors that use JIRA instances as a public bug tracking systems. I work for MariaDB Corporation and it would be natural for me to write about MariaDB's JIRA that I use every day.

As a side note, Percona also switched to JIRA some time ago, and many of the JIRA-specific details described below (that are different comparing to good old https://bugs.mysql.com/) apply to Percona bugs …

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How to Get Details About MyRocks Deadlocks in MariaDB and Percona Server

In my previous post on ERROR 1213 I noted that Percona Server does not support the SHOW ENGINE ROCKSDB TRANSACTION STATUS statement to get deadlock details in "text" form. I've got some clarifications in my related feature request, PS-5114. So I decided to write this followup post and show what is the way to get deadlock details for the ROCKSDB tables in current versions of MariaDB and Percona Server.

First of all, I'd like to check MariaDB's implementation of MyRocks. For this I'll re-create deadlock scenario from that my post with MariaDB 10.3.12 I have at hand. We should start with installing ROCKSDB

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Fun with Bugs #75 - On MySQL Bug Reports I am Subscribed to, Part XII

From the lack of comments to my previous post it seems everything is clear with ERROR 1213 in different kinds and forks of MySQL. I may still write a post of two about MyRocks or TokuDB deadlocks one day, but let's get back to my main topic of MySQL bugs. Today I continue my series of posts about community bug reports I am subscribed to with a review of bugs reported in November, 2018, starting from the oldest and skipping those MySQL 8 regression ones I've already commented on. I also skip documentation bugs that should be a topic for a separate post one day (to give more illustration to …

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Fun with Bugs #74 - On MySQL Bug Reports I am Subscribed to, Part XI

For some reason the Committee of FOSDEM 2019 MySQL, MariaDB & Friends Devroom of all my talks submitted picked up the one on how to create a useful MySQL bug report, so I have no options but continue to write about MySQL bugs, as long and MySQL Community wants and even prefers to listen and read about them... That's what I do, with pleasure.

Today I'll continue my series of posts about community bug reports I am subscribed to with the review of bugs reported since October 1, 2018, starting from the oldest and skipping those MySQL 8 regression ones I've already commented on:

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