我使用jdbc连接配置连接到cassandra集群。 当我的测试完成后，在我的终端中它仍然继续输出心跳日志：
18：05：02.306 [cluster1-nio-worker-4] DEBUG com.datastax.driver.core.Connection - Connection [/10.11.8.103:9042-1,inFlight = 0，closed = false]无效30秒，发送心跳 18：05：02.307 [cluster1-nio-worker-4] DEBUG com.datastax.driver.core.Connection - Connection [/10.11.8.103:9042-1,inFlight = 0，closed = false]心跳查询成功 18：05：02.312 [cluster1-nio-worker-5] DEBUG com.datastax.driver.core.Connection - Connection [/10.11.8.103:9042-2,inFlight = 0，closed = false]无效30秒，发送心跳 18：05：02.314 [cluster1-nio-worker-5] DEBUG com.datastax.driver.core.Connection - Connection [/10.11.8.103:9042-2,inFlight = 0，closed = false]心跳查询成功 18：05：02.575 [cluster1-nio-worker-8] DEBUG com.datastax.driver.core.Connection - Connection [cass01.di01.qa.itsonsaas.com/10.11.8.101：9042-3，inFlight = 0，关闭发送心跳，30秒无效 18：05：02.577 [cluster1-nio-worker-8] DEBUG com.datastax.driver.core.Connection - Connection [cass01.di01.qa.itsonsaas.com/10.11.8.101：9042-3，inFlight = 0，关闭= false]心跳查询成功 .......
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