cloud-fan commented on a change in pull request #27025: [SPARK-26560][SQL]
Spark should be able to run Hive UDF using jar regardless of current thread
context classloader
URL: https://github.com/apache/spark/pull/27025#discussion_r361947939
##########
File path:
sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/SQLQuerySuite.scala
##########
@@ -2491,4 +2492,47 @@ class SQLQuerySuite extends QueryTest with SQLTestUtils
with TestHiveSingleton {
}
}
}
+
+ test("SPARK-26560 Spark should be able to run Hive UDF using jar regardless
of " +
+ "current thread context classloader") {
+ // force to use Spark classloader as other test (even in other test
suites) may change the
+ // current thread's context classloader to jar classloader
+ Utils.withContextClassLoader(Utils.getSparkClassLoader) {
+ withUserDefinedFunction("udtf_count3" -> false) {
+ val sparkClassLoader = Thread.currentThread().getContextClassLoader
+
+ // This jar file should not be placed to the classpath;
GenericUDTFCount3 is slightly
+ // modified version of GenericUDTFCount2 in hive/contrib, which emits
the count for
+ // three times.
+ val jarPath = "src/test/noclasspath/TestUDTF-spark-26560.jar"
+ val jarURL = s"file://${System.getProperty("user.dir")}/$jarPath"
+
+ sql(
+ s"""
+ |CREATE FUNCTION udtf_count3
+ |AS
'org.apache.hadoop.hive.contrib.udtf.example.GenericUDTFCount3'
+ |USING JAR '$jarURL'
+ """.stripMargin)
+
+ assert(Thread.currentThread().getContextClassLoader eq
sparkClassLoader)
+
+ // JAR will be loaded at first usage, and it will change the current
thread's
+ // context classloader to jar classloader in sharedState.
+ // See SessionState.addJar for details.
+ checkAnswer(
+ sql("SELECT udtf_count3(a) FROM (SELECT 1 AS a FROM src LIMIT 3) t"),
+ Row(3) :: Row(3) :: Row(3) :: Nil)
+
+ assert(Thread.currentThread().getContextClassLoader ne
sparkClassLoader)
+ assert(Thread.currentThread().getContextClassLoader eq
+ spark.sqlContext.sharedState.jarClassLoader)
+
+ // Roll back to the original classloader and run query again.
+ Thread.currentThread().setContextClassLoader(sparkClassLoader)
Review comment:
got it. Can we add some comments to explain it?
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