Hi Raghu, 

I have tried to reproduce the same with SP testcase + PS 5.6.21/MySQL 5.6.21 community + 3 parallel sessions. but I could not able to reproduce  it.  

On PS 5.6.21,

mysql> show processlist;
+----+------+-----------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+-----------+---------------+
| Id | User | Host      | db   | Command | Time | State     | Info                                                                                                 | Rows_sent | Rows_examined |
+----+------+-----------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+-----------+---------------+
| 45 | root | localhost | test | Query   |    0 | init      | show processlist                                                                                     |         0 |             0 |
| 46 | root | localhost | test | Query   |    0 | query end | replace into t1(a,b,who,rep_count,trx_count,trx_started)
         values(floor(3*rand()), floor(3*ra |       224 |         29262 |
| 48 | root | localhost | test | Sleep   |   19 |           | NULL                                                                                                 |         0 |             0 |
| 53 | root | localhost | test | Query   |    0 | update    | replace into t1(a,b,who,rep_count,trx_count,trx_started)
         values(floor(3*rand()), floor(3*ra |       150 |         17067 |
| 54 | root | localhost | test | Query   |    0 | query end | replace into t1(a,b,who,rep_count,trx_count,trx_started)
         values(floor(3*rand()), floor(3*ra |       179 |         25116 |
+----+------+-----------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+-----------+---------------+
5 rows in set (0.00 sec)


On MySQL 5.6.21, 

mysql> show processlist;
+----+------+-----------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+
| Id | User | Host      | db   | Command | Time | State     | Info                                                                                                 |
+----+------+-----------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+
|  1 | root | localhost | test | Sleep   |  109 |           | NULL                                                                                                 |
|  2 | root | localhost | test | Query   |    0 | init      | show processlist                                                                                     |
|  3 | root | localhost | test | Query   |    0 | query end | replace into t1(a,b,who,rep_count,trx_count,trx_started)
         values(floor(3*rand()), floor(3*ra |
|  4 | root | localhost | test | Query   |    0 | query end | replace into t1(a,b,who,rep_count,trx_count,trx_started)
         values(floor(3*rand()), floor(3*ra |
|  5 | root | localhost | test | Query   |    0 | update    | replace into t1(a,b,who,rep_count,trx_count,trx_started)
         values(floor(3*rand()), floor(3*ra |
+----+------+-----------+------+---------+------+-----------+------------------------------------------------------------------------------------------------------+
5 rows in set (0.00 sec)