Alan Gates created HIVE-18776:
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Summary: MaterializationsInvalidationCache loading causes race
condition in the metastore
Key: HIVE-18776
URL: https://issues.apache.org/jira/browse/HIVE-18776
Project: Hive
Issue Type: Bug
Components: Materialized views, Metastore
Affects Versions: 3.0.0
Reporter: Alan Gates
Assignee: Jesus Camacho Rodriguez
I am seeing occasional failures running metastore tests where operations are
failing saying that there is no open transaction. I have traced this to a race
condition in loading the materialized view invalidation cache. When it is
initialized (either in HiveMetaStoreClient in embedded mode or in HiveMetaStore
in remote mode) it grabs a copy of the current RawStore instance and then loads
the cache in a separate thread. But ObjectStore keeps state regarding JDO
transactions with the underlying RDBMS. So with the loader thread and the
initial thread both doing operations against the RawStore they sometimes mess
up each others transaction stack. In a quick test I used
HMSHandler.newRawStoreForConf() to fix this, which seemed to work.
A reference to the TxnHandler is also called. I suspect this will run into a
similar issue.
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