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https://issues.apache.org/jira/browse/FLINK-24626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17454639#comment-17454639
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Alexander Fedulov commented on FLINK-24626:
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[~Kenyore]Could you detail a sample SQL join query and which updates were
performed on the tables that led to the erroneous behavior?
> Flink JDBC Sink may lose data in left join
> ------------------------------------------
>
> Key: FLINK-24626
> URL: https://issues.apache.org/jira/browse/FLINK-24626
> Project: Flink
> Issue Type: Bug
> Components: Connectors / JDBC
> Reporter: Kenyore
> Priority: Major
> Labels: correctness
>
> The JDBC sink will lose some data while using
> TableBufferReducedStatementExecutor and left join.
> Here are a snippet of executeBatch.
> {code:java}
> @Override
> public void executeBatch() throws SQLException {
> for (Map.Entry<RowData, Tuple2<Boolean, RowData>> entry :
> reduceBuffer.entrySet()) {
> if (entry.getValue().f0) {
> upsertExecutor.addToBatch(entry.getValue().f1);
> } else {
> // delete by key
> deleteExecutor.addToBatch(entry.getKey());
> }
> }
> upsertExecutor.executeBatch();
> deleteExecutor.executeBatch();
> reduceBuffer.clear();
> }
> {code}
> Left join will generate a DETETE row before upsert row and the executeBatch
> will excute them in a wrong order.Whitch may causes data lose.
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