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Posted to issues@hive.apache.org by "Mustafa İman (Jira)" <ji...@apache.org> on 2021/04/21 00:50:00 UTC
[jira] [Work started] (HIVE-25040) Drop database cascade cannot
remove persistent functions
[ https://issues.apache.org/jira/browse/HIVE-25040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on HIVE-25040 started by Mustafa İman.
-------------------------------------------
> Drop database cascade cannot remove persistent functions
> --------------------------------------------------------
>
> Key: HIVE-25040
> URL: https://issues.apache.org/jira/browse/HIVE-25040
> Project: Hive
> Issue Type: Bug
> Reporter: Mustafa İman
> Assignee: Mustafa İman
> Priority: Major
>
> Add a persistent custom function to a database using a Jar file: CREATE FUNCTION myfunction USING JAR 'x.jar';
> Restart the session and immediately issue DROP DATABASE mydb CASCADE. It throws ClassCastException:
> {code:java}
> java.lang.ClassNotFoundException: DummyUDF
> at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_282]
> at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_282]
> at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_282]
> at java.lang.Class.forName0(Native Method) ~[?:1.8.0_282]
> at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_282]
> at org.apache.hadoop.hive.ql.exec.Registry.getPermanentUdfClass(Registry.java:549) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.exec.Registry.removePersistentFunctionUnderLock(Registry.java:586) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.exec.Registry.unregisterFunction(Registry.java:577) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.exec.Registry.unregisterFunctions(Registry.java:607) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.exec.FunctionRegistry.unregisterPermanentFunctions(FunctionRegistry.java:1731) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.ddl.database.drop.DropDatabaseOperation.execute(DropDatabaseOperation.java:62) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.ddl.DDLTask.execute(DDLTask.java:80) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:213) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:105) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.Executor.launchTask(Executor.java:357) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.Executor.launchTasks(Executor.java:330) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.Executor.runTasks(Executor.java:246) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.Executor.execute(Executor.java:109) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:748) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:497) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:491) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hadoop.hive.ql.reexec.ReExecDriver.run(ReExecDriver.java:166) ~[hive-exec-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hive.service.cli.operation.SQLOperation.runQuery(SQLOperation.java:225) ~[hive-service-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hive.service.cli.operation.SQLOperation.access$700(SQLOperation.java:87) ~[hive-service-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at org.apache.hive.service.cli.operation.SQLOperation$BackgroundWork$1.run(SQLOperation.java:322) ~[hive-service-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_282]
> at javax.security.auth.Subject.doAs(Subject.java:422) ~[?:1.8.0_282]
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1898) ~[hadoop-common-3.1.1.7.2.10.0-36.jar:?]
> at org.apache.hive.service.cli.operation.SQLOperation$BackgroundWork.run(SQLOperation.java:340) ~[hive-service-3.1.3000.7.2.10.0-36.jar:3.1.3000.7.2.10.0-36]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_282]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_282]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_282]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_282]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_282]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_282]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]
> {code}
>
> Since new session did not use the custom udf before trying to drop it, session state does not have the class loaded. Therefore it throws ClassNotFound exception. In this case we can ignore this exception since we do not need to reload it just to remove afterwards.
> Same thing does not happen with DROP FUNCTION because compiler loads the jar explicitly before trying to drop the function.
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