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Performance issue with all requests being routed to single slave (no replies)

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Using MyQL version 5.5 and JDBC driver ver 5.1.16
Connection pool maxSet is 50

Master / slave configuration comprises of the following
Master - For writes
Failover master - When not in master mode, it is used as a slave 2 in "read" mode
Slave 1 - Utilized for read

During a timeslice of 3 hours, we find that Slave 1 was inundated with 200 connections that brought the application to a halt. During this time the other slave received only 15 connections. Any guidance on cause / solution would be much appreciated.

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