We were able to solve this issue by changing my executors for those 
blocking actors. As a general pattern its better to do the following :

1. Finding actors behaviour/usage and identifying those service calling or 
IO performing actors.
2.Using thread pool executors instead of fork join pool executors for 
blocking actors. 

Thanks Kanard malawski  your blog nailed the cause . 

The only problem i faced in implementing is after defining a custom 
dispatcher i had to call withDispatcher() when i create those actor though 
i know all of my actor in a system requires this( akka doesnt allow deep 
child wildcard pattern matching in application.conf).

On Tuesday, February 16, 2016 at 9:33:17 AM UTC-6, Hareesh Jagannathan 
wrote:
>
> Akka application spins a lot of new dispatchers overtime instead of 
> reusing . The old dispatchers are going back to waiting state and never 
> been reused or terminated.
>
> We use akka's default dispatcher with fork-join executors. we do override 
> the default parallelism parameter between our actors based on actors 
> purpose.
>
> Is there a configuration that we are missing that causing this issue?
>

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