Spark：java.net.BindException: Address already in use: Service 'SparkUI' failed after 16 retries!

Spark多任务提交运行时候报错。

java.net.BindException: Address already in use: Service 'SparkUI' failed after 16 retries!
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:444)
at sun.nio.ch.Net.bind(Net.java:436)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.eclipse.jetty.server.nio.SelectChannelConnector.open(SelectChannelConnector.java:187)
at org.eclipse.jetty.server.AbstractConnector.doStart(AbstractConnector.java:316)
at org.eclipse.jetty.server.nio.SelectChannelConnector.doStart(SelectChannelConnector.java:265)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
at org.eclipse.jetty.server.Server.doStart(Server.java:293)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
at org.apache.spark.ui.JettyUtils$.org$apache$spark$ui$JettyUtils$$connect$1(JettyUtils.scala:194)
at org.apache.spark.ui.JettyUtils$$anonfun$2.apply(JettyUtils.scala:204)
at org.apache.spark.ui.JettyUtils$$anonfun$2.apply(JettyUtils.scala:204)
at org.apache.spark.util.Utils$$anonfun$startServiceOnPort$1.apply$mcVI$sp(Utils.scala:1676)
at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:141)
at org.apache.spark.util.Utils$.startServiceOnPort(Utils.scala:1667)
at org.apache.spark.ui.JettyUtils$.startJettyServer(JettyUtils.scala:204)
at org.apache.spark.ui.WebUI.bind(WebUI.scala:102)
at org.apache.spark.SparkContext$$anonfun$10.apply(SparkContext.scala:269)
at org.apache.spark.SparkContext$$anonfun$10.apply(SparkContext.scala:269)
at scala.Option.foreach(Option.scala:236)
at org.apache.spark.SparkContext.(SparkContext.scala:269)
at org.apache.spark.api.java.JavaSparkContext.(JavaSparkContext.scala:61)
at com.Spark.FileInput.main(FileInput.java:80)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:358)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

错误原因：

每一个Spark任务都会占用一个SparkUI端口，默认为4040，如果被占用则依次递增端口重试。但是有个默认重试次数，为16次。16次重试都失败后，会放弃该任务的运行。

解决方法

初始化SparkConf时，添加conf.set(“spark.port.maxRetries”,“100”)语句

使用spark-submit提交任务时，在命令行中添加-Dspark.port.maxRetries=100

在spark-defaults.conf中添加spark.port.maxRetries 100