如何通过Spark中的jdbc连接到docker托管的postgresql数据库？

我尝试使用JDBC和spark dataframe从托管在docker中的postgres数据库检索数据。postgres端口作为节点端口在我的Kubernetes集群中打开

使用以下方法设置连接：

val postgres_url=s“$databaseHost:32020”
val postgres_username=“xxxx”
val postgres_db_name=“yyyy”
//表数据帧的后期和后期连接
val jdbc_url=s“jdbc:postgresql://$postgres_url/$postgres_db_name”
val connectionProperties=新属性
connectionProperties.put（“用户”，postgres\u用户名）
connectionProperties.put（“driver”、“org.postgresql.driver”）

当使用

spark.read.jdbc

时，连接似乎可以正常工作，因为数据帧模式设置正确。但是，当我尝试访问实际数据时，在提供的端口之外的另一个端口中出现连接被拒绝错误（错误指的是

31816

，而不是

32020

）

val df_table=spark.read.jdbc（jdbc_url，“type_mime”，connectionProperties）
df_table.count（）

给出：

使用

psql

---

JDBC使用的端口是否与Postgres主端口不同？我应该在docker打开它吗？

我设法解决了这个问题。它与JDBC或Postgres无关

stacktrace显示，当Spark开始在执行器之间分配工作时，问题就会出现

事实上，我在Kubernetes上托管的齐柏林飞艇笔记本上运行我的代码，它已经没有新连接的可用端口了

希望这会有帮助

df_table: org.apache.spark.sql.DataFrame = [id: bigint, mime_type: string ... 1 more field] 
// Schema is correctly loaded

org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 26.0 failed 1 times, most recent failure: Lost task 0.0 in stage 26.0 (TID 211, localhost, executor driver): java.io.IOException: Failed to connect to /192.168.97.1:31816
        at org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:232)
        at org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:182)
        at org.apache.spark.rpc.netty.NettyRpcEnv.downloadClient(NettyRpcEnv.scala:366)
        at org.apache.spark.rpc.netty.NettyRpcEnv.openChannel(NettyRpcEnv.scala:332)
        at org.apache.spark.util.Utils$.doFetchFile(Utils.scala:654)
        at org.apache.spark.util.Utils$.fetchFile(Utils.scala:480)
        at org.apache.spark.executor.Executor$$anonfun$org$apache$spark$executor$Executor$$updateDependencies$5.apply(Executor.scala:696)
        at org.apache.spark.executor.Executor$$anonfun$org$apache$spark$executor$Executor$$updateDependencies$5.apply(Executor.scala:688)
        at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:733)
        at scala.collection.Iterator$class.foreach(Iterator.scala:893)
        at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
        at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
        at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
        at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:732)
        at org.apache.spark.executor.Executor.org$apache$spark$executor$Executor$$updateDependencies(Executor.scala:688)
        at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:308)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748) Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /192.168.97.1:31816
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
        at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:257)
        at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:291)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:631)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:566)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:480)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:131)
        at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144) ... 1 more 
Driver stacktrace:
        at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1499)
        at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1487)
        at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1486)
        at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
        at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
        at org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1486)
        at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:814)
        at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:814)
        at scala.Option.foreach(Option.scala:257)
        at org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:814)
        at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGScheduler.scala:1714)
        at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1669)
        at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1658)
        at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48)
        at org.apache.spark.scheduler.DAGScheduler.runJob(DAGScheduler.scala:630)
        at org.apache.spark.SparkContext.runJob(SparkContext.scala:2022)
        at org.apache.spark.SparkContext.runJob(SparkContext.scala:2043)
        at org.apache.spark.SparkContext.runJob(SparkContext.scala:2062)
        at org.apache.spark.SparkContext.runJob(SparkContext.scala:2087)
        at org.apache.spark.rdd.RDD$$anonfun$collect$1.apply(RDD.scala:936)
        at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
        at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)
        at org.apache.spark.rdd.RDD.withScope(RDD.scala:362)
        at org.apache.spark.rdd.RDD.collect(RDD.scala:935)
        at org.apache.spark.sql.execution.SparkPlan.executeCollect(SparkPlan.scala:278)
        at org.apache.spark.sql.Dataset$$anonfun$count$1.apply(Dataset.scala:2430)
        at org.apache.spark.sql.Dataset$$anonfun$count$1.apply(Dataset.scala:2429)
        at org.apache.spark.sql.Dataset$$anonfun$55.apply(Dataset.scala:2837)
        at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:65)
        at org.apache.spark.sql.Dataset.withAction(Dataset.scala:2836)
        at org.apache.spark.sql.Dataset.count(Dataset.scala:2429) ... 68 elided 
Caused by: java.io.IOException: Failed to connect to /192.168.97.1:31816
        at org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:232)
        at org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:182)
        at org.apache.spark.rpc.netty.NettyRpcEnv.downloadClient(NettyRpcEnv.scala:366)
        at org.apache.spark.rpc.netty.NettyRpcEnv.openChannel(NettyRpcEnv.scala:332)
        at org.apache.spark.util.Utils$.doFetchFile(Utils.scala:654)
        at org.apache.spark.util.Utils$.fetchFile(Utils.scala:480)
        at org.apache.spark.executor.Executor$$anonfun$org$apache$spark$executor$Executor$$updateDependencies$5.apply(Executor.scala:696)
        at org.apache.spark.executor.Executor$$anonfun$org$apache$spark$executor$Executor$$updateDependencies$5.apply(Executor.scala:688)
        at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:733)
        at scala.collection.Iterator$class.foreach(Iterator.scala:893)
        at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
        at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
        at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
        at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:732)
        at org.apache.spark.executor.Executor.org$apache$spark$executor$Executor$$updateDependencies(Executor.scala:688)
        at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:308) ... 3 more 
Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /192.168.97.1:31816
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
        at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:257)
        at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:291)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:631)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:566)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:480)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:131)
        at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144) ... 1 more