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https://issues.apache.org/jira/browse/SPARK-10625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14791830#comment-14791830
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Sean Owen commented on SPARK-10625:
-----------------------------------
Dumb question here, but if the driver needs these objects, and Spark needs to
serialize them, how will that ever work? Does the driver not actually need
them, just uses them if they're around?
> Spark SQL JDBC read/write is unable to handle JDBC Drivers that adds
> unserializable objects into connection properties
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-10625
> URL: https://issues.apache.org/jira/browse/SPARK-10625
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.1, 1.5.0
> Environment: Ubuntu 14.04
> Reporter: Peng Cheng
> Labels: jdbc, spark, sparksql
>
> Some JDBC drivers (e.g. SAP HANA) tries to optimize connection pooling by
> adding new objects into the connection properties, which is then reused by
> Spark to be deployed to workers. When some of these new objects are unable to
> be serializable it will trigger an org.apache.spark.SparkException: Task not
> serializable. The following test code snippet demonstrate this problem by
> using a modified H2 driver:
> test("INSERT to JDBC Datasource with UnserializableH2Driver") {
> object UnserializableH2Driver extends org.h2.Driver {
> override def connect(url: String, info: Properties): Connection = {
> val result = super.connect(url, info)
> info.put("unserializableDriver", this)
> result
> }
> override def getParentLogger: Logger = ???
> }
> import scala.collection.JavaConversions._
> val oldDrivers =
> DriverManager.getDrivers.filter(_.acceptsURL("jdbc:h2:")).toSeq
> oldDrivers.foreach{
> DriverManager.deregisterDriver
> }
> DriverManager.registerDriver(UnserializableH2Driver)
> sql("INSERT INTO TABLE PEOPLE1 SELECT * FROM PEOPLE")
> assert(2 === sqlContext.read.jdbc(url1, "TEST.PEOPLE1", properties).count)
> assert(2 === sqlContext.read.jdbc(url1, "TEST.PEOPLE1",
> properties).collect()(0).length)
> DriverManager.deregisterDriver(UnserializableH2Driver)
> oldDrivers.foreach{
> DriverManager.registerDriver
> }
> }
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