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https://issues.apache.org/jira/browse/IMPALA-13120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang reassigned IMPALA-13120:
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Assignee: Venugopal Reddy K
> Failed table loads are not tried to load again even though hive metastore is
> UP
> -------------------------------------------------------------------------------
>
> Key: IMPALA-13120
> URL: https://issues.apache.org/jira/browse/IMPALA-13120
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Venugopal Reddy K
> Assignee: Venugopal Reddy K
> Priority: Major
>
> *Description:*
> If the metastore is down at the time when the table load is triggered,
> catalogd creates a new IncompleteTable instance with
> cause=TableLoadingException and updates catalog with a new version. And on
> coordinator/impalad, StmtMetadataLoader loadTables() that has been waiting
> for table load to complete, considers table as loaded/failed load. Then
> during the analyzer’s table resolve step, if the table is incomplete,
> TableLoadingException is thrown to user.
> Note: IncompleteTable with cause not being null is considered as loaded.
> *Henceforth, queries on the table doesn’t trigger the table load(at
> StmtMetadataLoader) since the table is IncompleteTable with non-null
> cause(i.e.,TableLoadingException). Even though metastore is UP later at some
> time, queries continue to fail with same TableLoadingException:*
> {{CAUSED BY: TableLoadingException: Failed to load metadata for table:
> default.t1. Running 'invalidate metadata default.t1' may resolve this
> problem.}}
> {{CAUSED BY: MetaException: Could not connect to meta store using any of the
> URIs provided. Most recent failure:
> org.apache.thrift.transport.TTransportException: java.net.ConnectException:
> Connection refused (Connection refused)}}
> *At present, explicit Invalidate metadata is the only way to recover table
> from this state.* {*}Queries executed after metastore is up should succeed
> without the need for explicit invalidate metadata{*}{*}{{*}}
> *Steps to Reproduce:*
> # create a table from hive and insert some data into it.
> # Bring down the hive metastore process
> # Run a query on impala that triggers the table load. Query fails with
> TableLoadingException.
> # Bring up the hive metastore process
> # Run the query on impala again. It still fails with same
> TableLoadingException.
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