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https://issues.apache.org/jira/browse/HIVE-14139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15358251#comment-15358251
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Rui Li commented on HIVE-14139:
-------------------------------
The problem is that we failed to register the function with
{{Hive.registerAllFunctionsOnce -> reloadFunctions}}. When we call
{{FunctionRegistry.registerPermanentFunction}}, we set registerToSession to
false so that the custom jar won't be downloaded and we end up with a
{{ClassNotFoundException}}. Therefore we get the NPE when we try to drop the
function.
[~sershe] - I found this with latest master code. BTW do you know why we choose
not to register the function to session when calling
{{Hive.registerAllFunctionsOnce}}?
> NPE dropping permanent function
> -------------------------------
>
> Key: HIVE-14139
> URL: https://issues.apache.org/jira/browse/HIVE-14139
> Project: Hive
> Issue Type: Bug
> Reporter: Rui Li
> Assignee: Rui Li
>
> To reproduce:
> 1. Start a CLI session and create a permanent function.
> 2. Exit current CLI session.
> 3. Start a new CLI session and drop the function.
> Stack trace:
> {noformat}
> FAILED: error during drop function: java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.exec.Registry.removePersistentFunctionUnderLock(Registry.java:513)
> at
> org.apache.hadoop.hive.ql.exec.Registry.unregisterFunction(Registry.java:501)
> at
> org.apache.hadoop.hive.ql.exec.FunctionRegistry.unregisterPermanentFunction(FunctionRegistry.java:1532)
> at
> org.apache.hadoop.hive.ql.exec.FunctionTask.dropPermanentFunction(FunctionTask.java:228)
> at
> org.apache.hadoop.hive.ql.exec.FunctionTask.execute(FunctionTask.java:95)
> at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:197)
> at
> org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:100)
> at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1860)
> at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1564)
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1316)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1085)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1073)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:232)
> {noformat}
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