[jira] [Created] (IMPALA-8968) Fix self-event detection on database events.

["Anurag Mantripragada (Jira)" <ji...@apache.org>]

Anurag Mantripragada created IMPALA-8968:
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             Summary: Fix self-event detection on database events.
                 Key: IMPALA-8968
                 URL: https://issues.apache.org/jira/browse/IMPALA-8968
             Project: IMPALA
          Issue Type: Bug
          Components: Frontend
            Reporter: Anurag Mantripragada
            Assignee: Anurag Mantripragada


Self-events are not detected for DATABASE level events (create/alter/drop database). Reproduced using the below statements:
{code:java}
CREATE DATABASE test;

CREATE FUNCTION test.fn_test (INT, STRING) RETURNS BOOLEAN LOCATION '/test-warehouse/dummy.jar' SYMBOL='com.cloudera.impala.TestUdf';

DROP FUNCTION test.fn_test(INT, STRING);

DROP DATABASE test CASCADE; {code}
Since the event's processor could not detect self-events, it will try to process the ALTER_DATABASE event created by dropping the function. However, it doesn't find the DB and errors out like below:
{code:java}
I0923 16:09:46.042317  6727 MetastoreEventsProcessor.java:480] Received 2 events. Start event id : 30077I0923 16:09:46.042317  6727 MetastoreEventsProcessor.java:480] Received 2 events. Start event id : 30077I0923 16:09:46.042853  6727 MetastoreEvents.java:382] EventId: 30078 EventType: ALTER_DATABASE Creating event 30078 of type ALTER_DATABASE on database testI0923 16:09:46.044441  6727 MetastoreEvents.java:382] EventId: 30079 EventType: DROP_DATABASE Creating event 30079 of type DROP_DATABASE on database testI0923 16:09:46.050657  6727 MetastoreEvents.java:231] Total number of events received: 2 Total number of events filtered out: 0I0923 16:09:46.051167  6727 MetastoreEvents.java:382] EventId: 30078 EventType: ALTER_DATABASE Received exception Database test not found. Ignoring self-event evaluationE0923 16:09:46.056273  6727 MetastoreEventsProcessor.java:525] Unexpected exception received while processing eventJava exception follows:org.apache.impala.catalog.events.MetastoreNotificationException: Unable to process event 30078 of type ALTER_DATABASE. Event processing will be stopped. at org.apache.impala.catalog.events.MetastoreEventsProcessor.processEvents(MetastoreEventsProcessor.java:614) at org.apache.impala.catalog.events.MetastoreEventsProcessor.processEvents(MetastoreEventsProcessor.java:511) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)Caused by: org.apache.impala.catalog.DatabaseNotFoundException: Database test not found at org.apache.impala.catalog.CatalogServiceCatalog.updateDb(CatalogServiceCatalog.java:1060) at org.apache.impala.catalog.events.MetastoreEvents$AlterDatabaseEvent.process(MetastoreEvents.java:1225) at org.apache.impala.catalog.events.MetastoreEvents$MetastoreEvent.processIfEnabled(MetastoreEvents.java:316) at org.apache.impala.catalog.events.MetastoreEventsProcessor.processEvents(MetastoreEventsProcessor.java:609) ... 8 moreE0923 16:09:46.056489  6727 MetastoreEventsProcessor.java:631] Notification event is nullW0923 16:09:56.057376  6727 MetastoreEventsProcessor.java:504] Event processing is skipped since status is ERROR. Last synced event id is 30077{code}
 



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