SocketTimeout sets a socket timeout in the network layer. For any API call which is made the network waits for a response from the server and if the response is not received in the specified limit, socket times out. It is also applicable during connection. As of now, there is nothing in the driver which can close the connection if it is idle for a certain amount of time. I'd also mention there are much newer versions of the driver than v2.5.5. Latest is v.2.5.43. https://www.cloudera.com/downloads/connectors/impala/jdbc.html
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