描述：
flume实时监控云主机的新增日志
kafka接收flume的实时数据

SSS是在本地运行的，运行两天后，flume和kafka还在正常运行。IDEA的SSS突然报错了。连接失败。即scala停止运行了。

问题：
数据库是需要额外设置什么吗？

报错：

22/06/24 16:43:27 ERROR Executor: Exception in task 0.0 in stage 16137.0 (TID 16137)
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

Caused by: java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
22/06/24 16:43:27 WARN TaskSetManager: Lost task 0.0 in stage 16137.0 (TID 16137, LAPTOP-IDKAAD44, executor driver): com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

22/06/24 16:43:27 ERROR TaskSetManager: Task 0 in stage 16137.0 failed 1 times; aborting job
22/06/24 16:43:27 ERROR WriteToDataSourceV2Exec: Data source write support org.apache.spark.sql.execution.streaming.sources.MicroBatchWrite@26067213 is aborting.
22/06/24 16:43:27 ERROR WriteToDataSourceV2Exec: Data source write support org.apache.spark.sql.execution.streaming.sources.MicroBatchWrite@26067213 aborted.
22/06/24 16:43:27 ERROR MicroBatchExecution: Query [id = 1ddfccdb-d4ed-4622-8a44-ff217a3cd5c1, runId = c58ba5c3-c2d4-4bdb-b2c5-36cab49d6349] terminated with error
org.apache.spark.SparkException: Writing job aborted.
	at org.apache.spark.sql.execution.datasources.v2.V2TableWriteExec.writeWithV2(WriteToDataSourceV2Exec.scala:413)

Caused by: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 16137.0 failed 1 times, most recent failure: Lost task 0.0 in stage 16137.0 (TID 16137, LAPTOP-IDKAAD44, executor driver): com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure