diff options
3 files changed, 62 insertions, 4 deletions
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRDD.scala b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRDD.scala index cef92abbdc..2f6ba48dbc 100644 --- a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRDD.scala +++ b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRDD.scala @@ -159,7 +159,7 @@ private[sql] object JDBCRDD extends Logging { def getConnector(driver: String, url: String, properties: Properties): () => Connection = { () => { try { - if (driver != null) Utils.getContextOrSparkClassLoader.loadClass(driver) + if (driver != null) DriverRegistry.register(driver) } catch { case e: ClassNotFoundException => { logWarning(s"Couldn't find class $driver", e); diff --git a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala index 5f480083d5..d6b3fb3291 100644 --- a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala +++ b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala @@ -100,7 +100,7 @@ private[sql] class DefaultSource extends RelationProvider { val upperBound = parameters.getOrElse("upperBound", null) val numPartitions = parameters.getOrElse("numPartitions", null) - if (driver != null) Utils.getContextOrSparkClassLoader.loadClass(driver) + if (driver != null) DriverRegistry.register(driver) if (partitionColumn != null && (lowerBound == null || upperBound == null || numPartitions == null)) { @@ -136,7 +136,7 @@ private[sql] case class JDBCRelation( override val schema: StructType = JDBCRDD.resolveTable(url, table, properties) override def buildScan(requiredColumns: Array[String], filters: Array[Filter]): RDD[Row] = { - val driver: String = DriverManager.getDriver(url).getClass.getCanonicalName + val driver: String = DriverRegistry.getDriverClassName(url) JDBCRDD.scanTable( sqlContext.sparkContext, schema, diff --git a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/jdbc.scala b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/jdbc.scala index d4e0abc040..ae9af1eabe 100644 --- a/sql/core/src/main/scala/org/apache/spark/sql/jdbc/jdbc.scala +++ b/sql/core/src/main/scala/org/apache/spark/sql/jdbc/jdbc.scala @@ -17,10 +17,14 @@ package org.apache.spark.sql -import java.sql.{Connection, DriverManager, PreparedStatement} +import java.sql.{Connection, Driver, DriverManager, DriverPropertyInfo, PreparedStatement} +import java.util.Properties + +import scala.collection.mutable import org.apache.spark.Logging import org.apache.spark.sql.types._ +import org.apache.spark.util.Utils package object jdbc { private[sql] object JDBCWriteDetails extends Logging { @@ -179,4 +183,58 @@ package object jdbc { } } + + private [sql] class DriverWrapper(val wrapped: Driver) extends Driver { + override def acceptsURL(url: String): Boolean = wrapped.acceptsURL(url) + + override def jdbcCompliant(): Boolean = wrapped.jdbcCompliant() + + override def getPropertyInfo(url: String, info: Properties): Array[DriverPropertyInfo] = { + wrapped.getPropertyInfo(url, info) + } + + override def getMinorVersion: Int = wrapped.getMinorVersion + + override def getParentLogger: java.util.logging.Logger = wrapped.getParentLogger + + override def connect(url: String, info: Properties): Connection = wrapped.connect(url, info) + + override def getMajorVersion: Int = wrapped.getMajorVersion + } + + /** + * java.sql.DriverManager is always loaded by bootstrap classloader, + * so it can't load JDBC drivers accessible by Spark ClassLoader. + * + * To solve the problem, drivers from user-supplied jars are wrapped + * into thin wrapper. + */ + private [sql] object DriverRegistry extends Logging { + + private val wrapperMap: mutable.Map[String, DriverWrapper] = mutable.Map.empty + + def register(className: String): Unit = { + val cls = Utils.getContextOrSparkClassLoader.loadClass(className) + if (cls.getClassLoader == null) { + logTrace(s"$className has been loaded with bootstrap ClassLoader, wrapper is not required") + } else if (wrapperMap.get(className).isDefined) { + logTrace(s"Wrapper for $className already exists") + } else { + synchronized { + if (wrapperMap.get(className).isEmpty) { + val wrapper = new DriverWrapper(cls.newInstance().asInstanceOf[Driver]) + DriverManager.registerDriver(wrapper) + wrapperMap(className) = wrapper + logTrace(s"Wrapper for $className registered") + } + } + } + } + + def getDriverClassName(url: String): String = DriverManager.getDriver(url) match { + case wrapper: DriverWrapper => wrapper.wrapped.getClass.getCanonicalName + case driver => driver.getClass.getCanonicalName + } + } + } // package object jdbc |