Bug: When fetching hiveMetastoreJars from path, IsolatedClientLoader should get hive settings from origLoader.
Status: In Progress | Priority: Major | Resolution: 
Created: 15/Jun/22 23:40
Affects Version/s: 3.2.1

Hi all, 

I made a spark application where deploy-mode is YARN cluster and spark.sql.hive.metastore.jars is path and hive metastore version is 2.3.2.
And "spark.yarn.dist.files" was set so that the driver could refer to hive-related xml files in cluster mode.
{code}
spark.yarn.dist.files viewfs:///app/spark-3.2.1-bin-without-hadoop/conf/hive-site.xml,viewfs:///app/spark-3.2.1-bin-without-hadoop/conf/hivemetastore-site.xml,viewfs:///app/spark-3.2.1-bin-without-hadoop/conf/hiveserver2-site.xml
{code}

application failed with the following error.

{code}
22/06/14 13:51:46 INFO yarn.ApplicationMaster: Unregistering ApplicationMaster with FAILED (diag message: User class threw exception: org.apache.spark.sql.AnalysisException: java.lang.ExceptionInInitializerError: null
	at org.apache.spark.sql.hive.HiveExternalCatalog.withClient(HiveExternalCatalog.scala:111)
	at org.apache.spark.sql.hive.HiveExternalCatalog.databaseExists(HiveExternalCatalog.scala:224)
	at org.apache.spark.sql.internal.SharedState.externalCatalog$lzycompute(SharedState.scala:150)
	at org.apache.spark.sql.internal.SharedState.externalCatalog(SharedState.scala:140)
	at org.apache.spark.sql.hive.HiveSessionStateBuilder.externalCatalog(HiveSessionStateBuilder.scala:45)
	at org.apache.spark.sql.hive.HiveSessionStateBuilder.$anonfun$catalog$1(HiveSessionStateBuilder.scala:60)
	at org.apache.spark.sql.catalyst.catalog.SessionCatalog.externalCatalog$lzycompute(SessionCatalog.scala:118)
	at org.apache.spark.sql.catalyst.catalog.SessionCatalog.externalCatalog(SessionCatalog.scala:118)
	at org.apache.spark.sql.catalyst.catalog.SessionCatalog.listDatabases(SessionCatalog.scala:298)
	at org.apache.spark.sql.execution.datasources.v2.V2SessionCatalog.listNamespaces(V2SessionCatalog.scala:205)
	at org.apache.spark.sql.execution.datasources.v2.ShowNamespacesExec.run(ShowNamespacesExec.scala:42)
	at org.apache.spark.sql.execution.datasources.v2.V2CommandExec.result$lzycompute(V2CommandExec.scala:43)
	at org.apache.spark.sql.execution.datasources.v2.V2CommandExec.result(V2CommandExec.scala:43)
	at org.apache.spark.sql.execution.datasources.v2.V2CommandExec.executeCollect(V2CommandExec.scala:49)
	at org.apache.spark.sql.execution.QueryExecution$$anonfun$eagerlyExecuteCommands$1.$anonfun$applyOrElse$1(QueryExecution.scala:110)
	at org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$5(SQLExecution.scala:103)
	at org.apache.spark.sql.execution.SQLExecution$.withSQLConfPropagated(SQLExecution.scala:163)
	at org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$1(SQLExecution.scala:90)
	at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:775)
	at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:64)
	at org.apache.spark.sql.execution.QueryExecution$$anonfun$eagerlyExecuteCommands$1.applyOrElse(QueryExecution.scala:110)
	at org.apache.spark.sql.execution.QueryExecution$$anonfun$eagerlyExecuteCommands$1.applyOrElse(QueryExecution.scala:106)
	at org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$transformDownWithPruning$1(TreeNode.scala:481)
	at org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:82)
	at org.apache.spark.sql.catalyst.trees.TreeNode.transformDownWithPruning(TreeNode.scala:481)
	at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.org$apache$spark$sql$catalyst$plans$logical$AnalysisHelper$$super$transformDownWithPruning(LogicalPlan.scala:30)
	at org.apache.spark.sql.catalyst.plans.logical.AnalysisHelper.transformDownWithPruning(AnalysisHelper.scala:267)
	at org.apache.spark.sql.catalyst.plans.logical.AnalysisHelper.transformDownWithPruning$(AnalysisHelper.scala:263)
	at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.transformDownWithPruning(LogicalPlan.scala:30)
	at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.transformDownWithPruning(LogicalPlan.scala:30)
	at org.apache.spark.sql.catalyst.trees.TreeNode.transformDown(TreeNode.scala:457)
	at org.apache.spark.sql.execution.QueryExecution.eagerlyExecuteCommands(QueryExecution.scala:106)
	at org.apache.spark.sql.execution.QueryExecution.commandExecuted$lzycompute(QueryExecution.scala:93)
	at org.apache.spark.sql.execution.QueryExecution.commandExecuted(QueryExecution.scala:91)
	at org.apache.spark.sql.Dataset.<init>(Dataset.scala:219)
	at org.apache.spark.sql.Dataset$.$anonfun$ofRows$2(Dataset.scala:99)
	at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:775)
	at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:96)
	at org.apache.spark.sql.SparkSession.$anonfun$sql$1(SparkSession.scala:618)
	at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:775)
	at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:613)
	at buildExample.helloworld$.main(helloworld.scala:16)
	at buildExample.helloworld.main(helloworld.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.spark.deploy.yarn.ApplicationMaster$$anon$2.run(ApplicationMaster.scala:737)
Caused by: java.lang.ExceptionInInitializerError
	at org.apache.spark.sql.hive.client.HiveClientImpl$.newHiveConf(HiveClientImpl.scala:1257)
	at org.apache.spark.sql.hive.client.HiveClientImpl.newState(HiveClientImpl.scala:168)
	at org.apache.spark.sql.hive.client.HiveClientImpl.<init>(HiveClientImpl.scala:130)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.apache.spark.sql.hive.client.IsolatedClientLoader.createClient(IsolatedClientLoader.scala:313)
	at org.apache.spark.sql.hive.HiveUtils$.newClientForMetadata(HiveUtils.scala:496)
	at org.apache.spark.sql.hive.HiveUtils$.newClientForMetadata(HiveUtils.scala:356)
	at org.apache.spark.sql.hive.HiveExternalCatalog.client$lzycompute(HiveExternalCatalog.scala:71)
	at org.apache.spark.sql.hive.HiveExternalCatalog.client(HiveExternalCatalog.scala:70)
	at org.apache.spark.sql.hive.HiveExternalCatalog.$anonfun$databaseExists$1(HiveExternalCatalog.scala:224)
	at scala.runtime.java8.JFunction0$mcZ$sp.apply(JFunction0$mcZ$sp.java:23)
	at org.apache.spark.sql.hive.HiveExternalCatalog.withClient(HiveExternalCatalog.scala:102)
	... 47 more
Caused by: java.lang.IllegalArgumentException: URI scheme is not "file"
	at java.io.File.<init>(File.java:421)
	at org.apache.hadoop.hive.conf.HiveConf.findConfigFile(HiveConf.java:177)
	at org.apache.hadoop.hive.conf.HiveConf.<clinit>(HiveConf.java:145)
	... 62 more
)
{code}

When IsolatedClientLoader is initialized, while creating a new classloader, URL information about resources such as hive-site.xml that was previously referenced disappeared, and an error occurred in the findConfigFile function.
It works well in client mode because HIVE_HOME and HIVE_CONF_DIR are set in the host where the spark driver is running, so it finds hive setting files well such as the hive-site.xml. But in cluster mode, the only way to find hive configuration files is to get files from YARN Nodemanager usercache which is set via "spark.yarn.dist.files"

I don't know if this is the right way, but I created a issue.