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https://issues.apache.org/jira/browse/SPARK-10625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15029361#comment-15029361
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Peng Cheng commented on SPARK-10625:
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Hi committers, after 1.5.2 release this is still not merged, now this bugfix is
blocking us from committing other features (namely JDBC dialects for several
databases). Can you prompt me what should be done next to make it through the
next release? (resolve conflict? add more tests? should be easy). Thanks a lot
pals ------------------Yours Peng
> 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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