Jesus Camacho Rodriguez updated HIVE-18776:
    Attachment: HIVE-18776.patch

> 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
>            Priority: Major
>         Attachments: HIVE-18776.patch
> 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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