99 Design Exception

gistfile1.txt

exception 'Gazelle_Db_ConnectionPoolException' with message 'All connections for role 'writer' in connection pool 'db' failed, last failure  was: mysqlt error: [1040: Too many connections] in CONNECT(production.cx2epq7umvoj.us-east-1.rds.amazonaws.com, 'contests', '****', contests)
' in /usr/local/contests-origin/production/classes/Gazelle/Db/ConnectionPool.php:102
Stack trace:
#0 /usr/local/contests-origin/production/classes/Gazelle/Db/LoadBalancedDatabase.php(144): Gazelle_Db_ConnectionPool->getConnection('writer')
#1 /usr/local/contests-origin/production/classes/Gazelle/Db/LoadBalancedDatabase.php(359): Gazelle_Db_LoadBalancedDatabase->_getConnection('writer')
#2 /usr/local/contests-origin/production/classes/Gazelle/Db/LoadBalancedDatabase.php(506): Gazelle_Db_LoadBalancedDatabase->_getWriter()
#3 /usr/local/contests-origin/production/classes/Edge/Session/SessionHandler.php(145): Gazelle_Db_LoadBalancedDatabase->Execute('REPLACE INTO `s...', Array)
#4 /usr/local/contests-origin/production/classes/Edge/Session/SessionHandler.php(100): Edge_Session_SessionHandler->_databaseWrite('207dd6c24d261fb...', '{"thmtrx_sessio...', NULL)
#5 /usr/local/contests-origin/production/classes/Edge/Session.php(98): Edge_Session_SessionHandler->write('207dd6c24d261fb...', Array, NULL)
#6 /usr/local/contests-origin/production/classes/Contests/Application.php(315): Edge_Session->save()
#7 /usr/local/contests-origin/production/classes/Contests/Application.php(148): Contests_Application->writeSession()
#8 /usr/local/contests-origin/production/lib/ergo/classes/Ergo/Application.php(80): Contests_Application->onStop()
#9 /usr/local/contests-origin/production/lib/ergo/classes/Ergo.php(38): Ergo\Application->stop()
#10 /usr/local/contests-origin/production/htdocs/controller.php(15): Ergo::stop()
#11 {main}