NoHostAvailableException while reading in cassandra

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We are getting nohostavailable exception on client for reading 2000 rows( just 3 simple columns ), tried on different tables but ended up with same error. I changed socket connect and read timeout but still it didn't solve the issue. And I found that even if i execute the query on cqlsh on node with tracing on, i am getting trace not complete in 10 seconds error(its showing up sometimes and clear other times) after displaying the rows. I see all nodes are up and running with mem and cpu in normal state. Any help on where i need to look to find the issue, will be very much appreciated. Thanks. ( this is c2.1.5 open source )

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