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I/O threads busy error

Dear all,
I've got a 2 node Cassandra cluster(3.11.2). I'm using Datastax's c++ driver(ver 2.7) in my application to fetch/add data from the cluster(RHEL 6.9). Sometimes I'm getting the error "All connections on all I/O threads are busy" in my application.  I'm unable to figure out why I am getting this error infrequently and not everytime. 

Has anyone faced such errors before? Please let me know any possible reasons behind the issue.

Thanks and regards,
Vishal Sharma

P.S. I don't really know whether this is a Datastax driver's issue or Cassandra's issue that's why I'm posting this query here.
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