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https://issues.apache.org/jira/browse/HIVE-15761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergio Peña updated HIVE-15761:
-------------------------------
Attachment: HIVE-15761.1.patch
I couldn't figure out how to make query.execute() return null from the
getNextNotification() method. But I walked through the Datanucleus internals,
and found that null is returned when a NoQueryResultsException is caught on the
execute() method.
To avoid this error in the future, I am returning an empty
NotificationEventResponse object with 0 events as normally happens if execute()
returns 0 results.
> ObjectStore.getNextNotification could return an empty
> NotificationEventResponse causing TProtocolException
> -----------------------------------------------------------------------------------------------------------
>
> Key: HIVE-15761
> URL: https://issues.apache.org/jira/browse/HIVE-15761
> Project: Hive
> Issue Type: Bug
> Reporter: Hao Hao
> Assignee: Sergio Peña
> Attachments: HIVE-15761.1.patch
>
>
> If there is no new events greater than the requested event,
> ObjectStore.getNextNotification will return an empty
> NotificationEventResponse. And the client side will get the following
> exception:
> {noformat} [ERROR -
> org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:295)]
> Thrift error occurred during processing of message.
> org.apache.thrift.protocol.TProtocolException: Required field 'events' is
> unset! Struct:NotificationEventResponse(events:null)
> at
> org.apache.hadoop.hive.metastore.api.NotificationEventResponse.validate(NotificationEventResponse.java:310)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$get_next_notification_result.validate(ThriftHiveMetastore.java)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$get_next_notification_result$get_next_notification_resultStandardScheme.write(ThriftHiveMetastore.java)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$get_next_notification_result$get_next_notification_resultStandardScheme.write(ThriftHiveMetastore.java)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$get_next_notification_result.write(ThriftHiveMetastore.java)
> at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:53)
> at
> org.apache.hadoop.hive.metastore.TUGIBasedProcessor$1.run(TUGIBasedProcessor.java:110)
> at
> org.apache.hadoop.hive.metastore.TUGIBasedProcessor$1.run(TUGIBasedProcessor.java:106)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
> at
> org.apache.hadoop.hive.metastore.TUGIBasedProcessor.process(TUGIBasedProcessor.java:118)
> at
> org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:286)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745){noformat}
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