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Connection timeout expired while connecting to impala with impala JDBC Driver

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I am using impala2.12.0-cdh5.16.1 and connecting to impala with impala_jdbc_2.6.4.1005. Normally it runs very well, but when I run distcp (which cost the Cluster Network IO and HDFS IO), the java program may throw errors.

[Cloudera][ImpalaJDBCDriver](700100) Connection timeout expired. Details: Connection timed out.
java.sql.SQLException: [Cloudera][ImpalaJDBCDriver](700100) Connection timeout expired. Details: Connection timed out.
    at com.cloudera.impala.hivecommon.core.HiveJDBCCommonConnection.handleException(Unknown Source)
    at com.cloudera.impala.jdbc.core.LoginTimeoutConnection.connect(Unknown Source)
    at com.cloudera.impala.jdbc.common.BaseConnectionFactory.doConnect(Unknown Source)
    at com.cloudera.impala.jdbc.common.AbstractDriver.connect(Unknown Source)
    at java.sql.DriverManager.getConnection(
    at java.sql.DriverManager.getConnection(

I tried to add DriverManager.setLoginTimeout(120) to the program,but the error still exists. I think it may be happen because the Cluster Network IO is very high and there may be a parameter which can add the value of timeout so the error will disappear.

So, any suggestion about this? Thx.

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