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@ -265,13 +265,16 @@ class Connection extends PrimaryReadReplicaConnection {
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*/
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public function executeQuery(string $sql, array $params = [], $types = [], QueryCacheProfile $qcp = null): Result {
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$tables = $this->getQueriedTables($sql);
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if (count(array_intersect($this->tableDirtyWrites, $tables)) === 0 && !$this->isTransactionActive()) {
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if ($this->isTransactionActive()) {
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// Transacted queries go to the primary. The consistency of the primary guarantees that we can not run
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// into a dirty read.
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} elseif (count(array_intersect($this->tableDirtyWrites, $tables)) === 0) {
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// No tables read that could have been written already in the same request and no transaction active
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// so we can switch back to the replica for reading as long as no writes happen that switch back to the primary
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// We cannot log here as this would log too early in the server boot process
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$this->ensureConnectedToReplica();
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} else {
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// Read to a table that was previously written to
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// Read to a table that has been written to previously
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// While this might not necessarily mean that we did a read after write it is an indication for a code path to check
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$this->logger->debug('dirty table reads: ' . $sql, ['tables' => $this->tableDirtyWrites, 'reads' => $tables, 'exception' => new \Exception()]);
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}
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