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https://issues.apache.org/jira/browse/IMPALA-6900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Kaszab resolved IMPALA-6900.
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Resolution: Fixed
Fix Version/s: Impala 3.2.0
> Invalidate metadata operation is ignored at a coordinator if catalog is empty
> -----------------------------------------------------------------------------
>
> Key: IMPALA-6900
> URL: https://issues.apache.org/jira/browse/IMPALA-6900
> Project: IMPALA
> Issue Type: Bug
> Components: Catalog
> Affects Versions: Impala 3.0, Impala 2.12.0
> Reporter: Dimitris Tsirogiannis
> Priority: Blocker
> Fix For: Impala 3.2.0
>
>
> The following workflow may cause an impalad that issued an invalidate
> metadata to falsely consider that the effect of that operation has taken
> effect, thus causing subsequent queries to fail due to unresolved references
> to tables or databases.
> Steps to reproduce:
> # Start an impala cluster connecting to an empty HMS (no databases).
> # Create a database "db" in HMS outside of Impala (e.g. using Hive).
> # Run INVALIDATE METADATA through Impala.
> # Run "use db" statement in Impala.
>
> The while condition in the code snippet below is cause the
> WaitForMinCatalogUpdate function to prematurely return even though INVALIDATE
> METADATA has not taken effect:
> {code:java}
> void ImpalaServer::WaitForMinCatalogUpdate(..) {
> ...
> VLOG_QUERY << "Waiting for minimum catalog object version: "
> << min_req_catalog_object_version << " current version: "
> << min_catalog_object_version;
> while (catalog_update_info_.min_catalog_object_version <
> min_req_catalog_object_version && catalog_update_info_.catalog_service_id ==
> catalog_service_id) {
> catalog_version_update_cv_.Wait(unique_lock);
> }
> {code}
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