[mythtv-commits] Ticket #9773: Deadlocked BE

[MythTV]

#9773: Deadlocked BE
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 Reporter:  warpme@…                    |          Owner:
     Type:  Bug Report - Hang/Deadlock  |         Status:  new
 Priority:  minor                       |      Milestone:  unknown
Component:  MythTV - General            |        Version:  Trunk Head
 Severity:  medium                      |     Resolution:
 Keywords:                              |  Ticket locked:  0
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Comment (by Github):

 Enable automatic reconnection for MySQL connections.

 After 155138a127 changed the minimum supported Qt version to 4.6, we now
 have support for MYSQL_OPT_RECONNECT in
 QSqlDatabase::setConnectOptions().

 Note that before MySQL 5, reconnecting connections were the default in
 the MySQL C API (so, were always enabled for the Qt-MySQL driver).
 Unfortunately, depending on how the application is written,
 reconnections may cause issues (since reconnections have effects on
 transactions, table locks, temporary tables, session and user variables,
 prepared statements, and such), so MySQL 5.0.3 changed the default to
 disable automatic reconnections, and MySQL 5.0.13 added
 MYSQL_OPT_RECONNECT to make reconnection an application-controllable
 option.  Since the Qt-MySQL driver didn't have support for specifying
 MYSQL_OPT_RECONNECT, it was impossible to get reconnecting connections
 with MySQL 5.0.3+ in Qt applications.  Finally in Qt4.6, Qt devs added
 support for specifying MYSQL_OPT_RECONNECT, so we can re-enable
 automatic reconnect.

 Thanks to David Edwards for the reminder to set this option.

 Refs #9704, #9773, #9792.
  Branch:    master
  Changeset: dd2d7a14d10c55f8bc8d12e944adb3b3c9ac8cea

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Ticket URL: <http://code.mythtv.org/trac/ticket/9773#comment:10>
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