[jira] [Commented] (FLINK-23813) DeleteExecutor NPE

["Xintong Song (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-23813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17400246#comment-17400246 ] 

Xintong Song commented on FLINK-23813:
--------------------------------------

cc [~roman_khachatryan]
Would you please help check on this?

> DeleteExecutor NPE
> ------------------
>
>                 Key: FLINK-23813
>                 URL: https://issues.apache.org/jira/browse/FLINK-23813
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / JDBC
>    Affects Versions: 1.14.0, 1.12.5, 1.13.2
>            Reporter: Junning Liang
>            Priority: Critical
>             Fix For: 1.14.0, 1.12.6, 1.13.3
>
>
> Encountered a situation where I get an NPE from JDBCUpsertOutputFormat.
> This occurs when jdbc disconnected and try to reconnect.
> I need to write data to mysql in upsert way in sql, So it must group by unique key and the JdbcBatchingOutputFormat of Jdbc sink would use TableJdbcUpsertOutputFormat.
>  
> Jdbc would disconnected when The data interval exceeds the set connection time.I see that when jdbc reconnect , only JdbcBatchingOutputFormat#jdbcStatementExecutor(insert) would prepareStatements but TableJdbcUpsertOutputFormat#deleteExecutor would not prepareStatements so that come up NPE.
> if in JdbcBatchingOutputFormat have a protected function to reset PrepareStatement and TableJdbcUpsertOutputFormat override this function to reset deleteExecutor, it would work well.
> prepareStatements 



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