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https://issues.apache.org/jira/browse/IMPALA-13170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17859619#comment-17859619
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Quanlong Huang commented on IMPALA-13170:
-----------------------------------------
Uploaded a patch for review: https://gerrit.cloudera.org/#/c/21546/
> InconsistentMetadataFetchException due to database dropped when showing
> databases
> ---------------------------------------------------------------------------------
>
> Key: IMPALA-13170
> URL: https://issues.apache.org/jira/browse/IMPALA-13170
> Project: IMPALA
> Issue Type: Bug
> Components: Catalog
> Affects Versions: Impala 3.4.0
> Reporter: Yida Wu
> Assignee: Quanlong Huang
> Priority: Major
>
> Using impalad 3.4.0, an InconsistentMetadataFetchException occurs when
> running "show databases" in Impala while simultaneously executing "drop
> database" to drop the newly created database in Hive.
> Step is:
> 1, Creates database (Hive)
> 2, Creates tables (Hive)
> 3, Drops tables (Hive)
> 4, Run show databases (Impala) Drop database (Hive)
> Logs in Impalad:
> {code:java}
> I0610 02:18:32.435815 278475 CatalogdMetaProvider.java:1354] 11111:22222]
> Invalidated objects in cache: [list of database names, HMS_METADATA for DB
> test_hive]
> I0610 02:18:32.436224 278475 jni-util.cc:288] 11111:22222]
> org.apache.impala.catalog.local.InconsistentMetadataFetchException: Fetching
> DATABASE failed. Could not find TCatalogObject(type:DATABASE,
> catalog_version:0, db:TDatabase(db_name:test_hive))
>
>
>
> at
> org.apache.impala.catalog.local.CatalogdMetaProvider.sendRequest(CatalogdMetaProvider.java:424)
> at
> org.apache.impala.catalog.local.CatalogdMetaProvider.access$100(CatalogdMetaProvider.java:185)
> at
> org.apache.impala.catalog.local.CatalogdMetaProvider$2.call(CatalogdMetaProvider.java:643)
> at
> org.apache.impala.catalog.local.CatalogdMetaProvider$2.call(CatalogdMetaProvider.java:638)
> at
> org.apache.impala.catalog.local.CatalogdMetaProvider.loadWithCaching(CatalogdMetaProvider.java:521)
> at
> org.apache.impala.catalog.local.CatalogdMetaProvider.loadDb(CatalogdMetaProvider.java:635)
> at org.apache.impala.catalog.local.LocalDb.getMetaStoreDb(LocalDb.java:91)
> at org.apache.impala.catalog.local.LocalDb.getOwnerUser(LocalDb.java:294)
> at org.apache.impala.service.Frontend.getDbs(Frontend.java:1066)
> at org.apache.impala.service.JniFrontend.getDbs(JniFrontend.java:301)
> I0610 02:18:32.436257 278475 status.cc:129] 11111:22222]
> InconsistentMetadataFetchException: Fetching DATABASE failed. Could not find
> TCatalogObject(type:DATABASE, catalog_version:0,
> {code}
> Logs in Catalog:
> {code:java}
> I0610 02:18:16.190133 222885 MetastoreEvents.java:505] EventId: 141467532
> EventType: CREATE_DATABASE Successfully added database test_hive
> ...
> I0610 02:18:32.276082 222885 MetastoreEvents.java:516] EventId: 141467562
> EventType: DROP_DATABASE Creating event 141467562 of type DROP_DATABASE on
> database test_hive
> I0610 02:18:32.277876 222885 MetastoreEvents.java:254] Total number of events
> received: 6 Total number of events filtered out: 0
> I0610 02:18:32.277910 222885 MetastoreEvents.java:258] Incremented skipped
> metric to 2564
> I0610 02:18:32.279537 222885 MetastoreEvents.java:505] EventId: 141467562
> EventType: DROP_DATABASE Removed Database test_hive
> {code}
> The case is similar to IMPALA-9441. We may want to handle the error in a
> better way in Frontend.getDbs().
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