Echo Lee created FLINK-30371:
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Summary: JdbcOutputFormat is at risk of database connection leaks
Key: FLINK-30371
URL: https://issues.apache.org/jira/browse/FLINK-30371
Project: Flink
Issue Type: Bug
Components: Connectors / JDBC
Affects Versions: 1.16.0, 1.16.1, jdbc-3.0.0
Reporter: Echo Lee
Fix For: jdbc-3.0.0
When writing to the target table fails for some reason, for example, the target
table does not exist.
The internal call sequence of JdbcOutputFormat is:
JdbcOutputFormat#flush(throws IOException) --> JdbcOutputFormat#close -->
JdbcOutputFormat#flush(throws RuntimeException).
Will not call the close method of the database connection, this will cause the
number of database connections to continue to rise and reach the limit.
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