title: NoHostAvailableException Found at the Time of data reading from Cassandra
body: <p>I am using Cassandra 2.1.5, and Cassandra-java-driver 2.0.10. I am facing below Exception when i am fetching Data from Cassandra Table. </p>
  
  <p>com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.1:9042 (com.datastax.driver.core.TransportException: [/127.0.0.1:9042] Connection has been closed))
      at com.datastax.driver.core.exceptions.NoHostAvailableException.copy(NoHostAvailableException.java:84)
      at com.datastax.driver.core.DefaultResultSetFuture.extractCauseFromExecutionException(DefaultResultSetFuture.java:265)
      at com.datastax.driver.core.DefaultResultSetFuture.getUninterruptibly(DefaultResultSetFuture.java:179)
      at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:52)
      at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:36)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at com.datastax.spark.connector.cql.SessionProxy.invoke(SessionProxy.scala:33)
      at com.sun.proxy.$Proxy8.execute(Unknown Source)
      at com.exportstagging.SparkTest.ProductDataLoader.dbQuery(ProductDataLoader.java:418)
      at com.exportstagging.SparkTest.ProductDataLoader.main(ProductDataLoader.java:442)
  Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.1:9042 (com.datastax.driver.core.TransportException: [/127.0.0.1:9042] Connection has been closed))
      at com.datastax.driver.core.RequestHandler.reportNoMoreHosts(RequestHandler.java:216)
      at com.datastax.driver.core.RequestHandler.access$900(RequestHandler.java:45)
      at com.datastax.driver.core.RequestHandler$SpeculativeExecution.sendRequest(RequestHandler.java:276)
      at com.datastax.driver.core.RequestHandler$SpeculativeExecution$1.run(RequestHandler.java:374)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)</p>
  
  <p>In my cassandra Table there is 50000 columns and 380000 rows. when i am fire this query i am getting above error.</p>
  
  <p>Select * from mykeyspace.productdata Where id In (1,...,6000).</p>
  
  <p>I have used token to create batching for fetching data from Cassandra.</p>