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[SPARK-19997] [SQL]fix proxy ugi could not get tgt to cause metastore connecting problem #17333

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[SPARK-19997] [SQL]fix proxy ugi could not get tgt to cause metastore connecting problem #17333

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26 changes: 24 additions & 2 deletions sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,8 @@
package org.apache.spark.sql.hive.client

import java.io.{File, PrintStream}
import java.lang.reflect.UndeclaredThrowableException
import java.security.PrivilegedExceptionAction

import scala.collection.JavaConverters._
import scala.collection.mutable.ArrayBuffer
Expand All @@ -27,7 +29,7 @@ import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.Path
import org.apache.hadoop.hive.conf.HiveConf
import org.apache.hadoop.hive.metastore.{TableType => HiveTableType}
import org.apache.hadoop.hive.metastore.api.{Database => HiveDatabase, FieldSchema}
import org.apache.hadoop.hive.metastore.api.{FieldSchema, Database => HiveDatabase}
import org.apache.hadoop.hive.metastore.api.{SerDeInfo, StorageDescriptor}
import org.apache.hadoop.hive.ql.Driver
import org.apache.hadoop.hive.ql.metadata.{Hive, Partition => HivePartition, Table => HiveTable}
Expand Down Expand Up @@ -189,7 +191,7 @@ private[hive] class HiveClientImpl(
if (clientLoader.cachedHive != null) {
Hive.set(clientLoader.cachedHive.asInstanceOf[Hive])
}
SessionState.start(state)
doAsRealUser(SessionState.start(state))
state.out = new PrintStream(outputBuffer, true, "UTF-8")
state.err = new PrintStream(outputBuffer, true, "UTF-8")
state
Expand Down Expand Up @@ -895,4 +897,24 @@ private[hive] class HiveClientImpl(
parameters =
if (hp.getParameters() != null) hp.getParameters().asScala.toMap else Map.empty)
}


/**
* Run some code as the real logged in user (which may differ from the current user, for
* example, when using proxying).
*/
private def doAsRealUser[T](fn: => T): T = {
val currentUser = UserGroupInformation.getCurrentUser()
val realUser = Option(currentUser.getRealUser()).getOrElse(currentUser)

// For some reason the Scala-generated anonymous class ends up causing an
// UndeclaredThrowableException, even if you annotate the method with @throws.
try {
realUser.doAs(new PrivilegedExceptionAction[T]() {
override def run(): T = fn
})
} catch {
case e: UndeclaredThrowableException => throw Option(e.getCause()).getOrElse(e)
}
}
}