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Hmm, I just got that error with XFI 1.5.1 / XF 2.2.7 PL 1

XF\Db\Exception: MySQL statement prepare error [2006]: MySQL server has gone away src/XF/Db/AbstractStatement.php:230

[code]

#0 src/XF/Db/Mysqli/Statement.php(198): XF\Db\AbstractStatement->getException('MySQL statement...', 2006, 'HY000')

#1 src/XF/Db/Mysqli/Statement.php(41): XF\Db\Mysqli\Statement->getException('MySQL statement...', 2006, 'HY000')

#2 src/XF/Db/Mysqli/Statement.php(56): XF\Db\Mysqli\Statement->prepare()

#3 src/XF/Db/AbstractAdapter.php(96): XF\Db\Mysqli\Statement->execute()

#4 src/XF/Db/AbstractAdapter.php(152): XF\Db\AbstractAdapter->query('

            SELECT MAX(...', Array)

#5 src/addons/XFI/Import/Importer/vBulletin.php(3637): XF\Db\AbstractAdapter->fetchOne('

            SELECT MAX(...')

#6 src/XF/Import/Runner.php(210): XFI\Import\Importer\vBulletin->getStepEndPostEditHistory()

#7 src/XF/Import/Runner.php(83): XF\Import\Runner->setupRunnableStep()

#8 src/XF/Import/ParallelRunner.php(21): XF\Import\Runner->initializeRun()

#9 src/XF/Import/Runner.php(130): XF\Import\ParallelRunner->runUntilCompleteInternal(Object(XF\Import\Manager), Object(Closure))

#10 src/XF/Cli/Command/Import.php(156): XF\Import\Runner->runUntilComplete(Object(XF\Import\Manager), Object(Closure))

#11 src/vendor/symfony/console/Command/Command.php(255): XF\Cli\Command\Import->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#12 src/vendor/symfony/console/Application.php(992): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#13 src/vendor/symfony/console/Application.php(255): Symfony\Component\Console\Application->doRunCommand(Object(XF\Cli\Command\Import), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#14 src/vendor/symfony/console/Application.php(148): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#15 src/XF/Cli/Runner.php(111): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

#16 cmd.php(15): XF\Cli\Runner->run()

#17 {main}

[/code]

As far as I can see, wait_timeout does get increased for the XenForo DB connection, but it does not seem to be increased as well for the source DB connection which is used within the watcher process to get lower/upper ID boundaries for each import step?