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