问在MySql中查找挂起的锁或事务

EN

    CommandHelper::log("Calling beginTransaction for item $item->id");
    $transaction = Yii::app()->db->beginTransaction();
    CommandHelper::log("Trying to get update lock for item $item->id");
    try {
       // this line will lock a single row
        $item = Item::model()->findBySql("SELECT * FROM " . $item::model()->getTableSchema()->name . " WHERE id=$item->id FOR UPDATE");
        if(!$item)
            throw new Exception("Item $item->id not found in processItem");
        CommandHelper::log("Obtained update lock for item $item->id");


    $now = DateTimeHelper::getInstance()->getStringNow();
    // the following call executes a few queries and causes an exception
    $this->processExpiredDeferredPayments($item,$now);
    // we won't get here
    CommandHelper::log("Item $item->id query confirmed units");
   ....
   ....

        $transaction->commit();

    } catch (Exception $e) {
        $transaction->rollBack();            
        CommandHelper::log("Transaction error:" . $e->getMessage());
    }

...
...
2017-06-03 14:46:04 Item 164 start processing
2017-06-03 14:46:04 Calling beginTransaction for item 164
2017-06-03 14:46:04 Trying to get update lock for item 164
2017-06-03 14:46:04 Obtained update lock for item 164
2017-06-03 14:46:04 Transaction error:There is already an active transaction
2017-06-03 14:46:04 Item 164 end processing
2017-06-03 14:46:04 Item 160 start processing
2017-06-03 14:46:04 Calling beginTransaction for item 160
2017-06-03 14:46:04 Trying to get update lock for item 160
2017-06-03 14:46:04 Obtained update lock for item 160
2017-06-03 14:46:04 Transaction error:There is already an active transaction
2017-06-03 14:46:04 Item 160 end processing
2017-06-03 14:46:04 Item 182 start processing
2017-06-03 14:46:04 Calling beginTransaction for item 182
2017-06-03 14:46:04 Trying to get update lock for item 182
2017-06-03 14:46:04 Obtained update lock for item 182
2017-06-03 14:46:04 Transaction error:There is already an active transaction
2017-06-03 14:46:04 Item 182 end processing
...
...

=====================================
2017-06-03 15:00:16 2af55a655700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 10 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 139314 srv_active, 0 srv_shutdown, 2478167 srv_idle
srv_master_thread log flush and writes: 2617481
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 139170
OS WAIT ARRAY INFO: signal count 139073
Mutex spin waits 15233, rounds 456961, OS waits 14580
RW-shared spins 123701, rounds 3711390, OS waits 123173
RW-excl spins 89, rounds 42528, OS waits 1410
Spin rounds per wait: 30.00 mutex, 30.00 RW-shared, 477.84 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 233590159
Purge done for trx's n:o < 233589999 undo n:o < 0 state: running but idle
History list length 2636
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 225441219, not started
MySQL thread id 271018, OS thread handle 0x2af55a655700, query id 28702104 172.31.10.242 ebroot init
show engine innodb status
---TRANSACTION 0, not started
MySQL thread id 271017, OS thread handle 0x2af55bfa6700, query id 28698794 172.31.10.242 ebroot cleaning up
---TRANSACTION 233590158, not started
MySQL thread id 1, OS thread handle 0x2af55a550700, query id 28702102 localhost 127.0.0.1 rdsadmin cleaning up
   --------
   FILE I/O
   --------
   ...
   ...