scala+mysql，The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
提交作业时，出现连接不上的问题在本地IDEA生成jar包，放到虚拟机上执行提交任务时，出现以下错误。
下面展示一些 报错片段。
Exception in thread "main" java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)
at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:906)
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:831)
at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:456)
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199)
at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$.$anonfun$createConnectionFactory$1(JdbcUtils.scala:64)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCRDD$.resolveTable(JDBCRDD.scala:56)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCRelation$.getSchema(JDBCRelation.scala:226)
at org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider.createRelation(JdbcRelationProvider.scala:35)
at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:339)
at org.apache.spark.sql.DataframeReader.loadV1Source(DataframeReader.scala:279)
at org.apache.spark.sql.DataframeReader.$anonfun$load$2(DataframeReader.scala:268)
at scala.Option.getOrElse(Option.scala:189)
at org.apache.spark.sql.DataframeReader.load(DataframeReader.scala:268)
at org.apache.spark.sql.DataframeReader.load(DataframeReader.scala:203)
at org.apache.spark.sql.DataframeReader.jdbc(DataframeReader.scala:294)
at org.apache.spark.sql.DataframeReader.jdbc(DataframeReader.scala:336)
at summ.ReqGenerateProdSrc_7$.main(ReqGenerateProdSrc_7.scala:50)
at summ.ReqGenerateProdSrc_7.main(ReqGenerateProdSrc_7.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:928)
at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:180)
at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:203)
at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:90)
at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1007)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1016)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: 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.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)
at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167)
at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:91)
at com.mysql.cj.NativeSession.connect(NativeSession.java:144)
at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:850)
... 30 more
Caused by: java.net.ConnectException: 拒绝连接 (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:155)
at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:65)
... 32 more
解决方案
百度了问题，也有很多博主给出了解决方案，最终还是不太行，下面是我的解决方案，同时附上可能出现问题的地方。
- 在IDEA中创建连接写的数据源连接代码，需要加上自动连接
下面展示一些 代码片。
--autoReconnect=true&failOverReadOnly=false，这两个参数需要加上 val url = "jdbc:mysql://172.1.3.111:3306/alm_result_0?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadonly=false&serverTimezone=UTC"
我是通过虚拟机与本地连接的方式，mysql在我本地，所以IP也需要改成我本地的IP。
- 注释掉setMaster(“local[]")以及.master("local[]”)
val conf: SparkConf = new SparkConf()
// .setMaster("local[*]")
.setAppName("ReqGenerateProdSrc_7")
val sc = new SparkContext(conf)
val sparkSession: SparkSession = SparkSession.builder()
// .master("local[*]")
- 提交作业的时候，一直出现classnotfound的报错，验证了不是数据连接的问题，那么就要考虑是否是jar包的问题，在jar Artifacts的时候，把多余的依赖包去掉。只剩下自身，如果后续说依赖包不存在，再添加即可
bin/spark-submit --class summ.ReqGenerateProdSrc_7 --master yarn --deploy-mode client /opt/module/jar/batch.jar --driver-memory 2g --executor-memory 2g --num-executors 2 --executor-cores 24
今天你摸鱼了吗~欢迎留言
