[jira] [Commented] (HIVE-18886) ACID: NPE on unexplained mysql exceptions

["Gopal V (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-18886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388769#comment-16388769 ] 

Gopal V commented on HIVE-18886:
--------------------------------

This is the fall-back exception

{code}
        checkRetryable(dbConn, e, "getOpenTxns");
        throw new MetaException("Unable to select from transaction database, "
          + StringUtils.stringifyException(e));
{code}

> ACID: NPE on unexplained mysql exceptions 
> ------------------------------------------
>
>                 Key: HIVE-18886
>                 URL: https://issues.apache.org/jira/browse/HIVE-18886
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 3.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Major
>         Attachments: HIVE-18886.1.patch
>
>
> At 200+ sessions on a single HS2, the DbLock impl fails to propagate mysql exceptions
> {code}
> 2018-03-06T22:55:16,197 ERROR [HiveServer2-Background-Pool: Thread-12867]: ql.Driver (:()) - FAILED: Error in acquiring locks: null
> java.lang.NullPointerException
>         at org.apache.hadoop.hive.metastore.DatabaseProduct.isDeadlock(DatabaseProduct.java:56)
>         at org.apache.hadoop.hive.metastore.txn.TxnHandler.checkRetryable(TxnHandler.java:2459)
>         at org.apache.hadoop.hive.metastore.txn.TxnHandler.getOpenTxns(TxnHandler.java:499)
> {code}
> {code}
>     return e instanceof SQLTransactionRollbackException
>         || ((dbProduct == MYSQL || dbProduct == POSTGRES || dbProduct == SQLSERVER)
>             && e.getSQLState().equals("40001"))
>         || (dbProduct == POSTGRES && e.getSQLState().equals("40P01"))
>         || (dbProduct == ORACLE && (e.getMessage().contains("deadlock detected")
>             || e.getMessage().contains("can't serialize access for this transaction")));
> {code}



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