wangsan created FLINK-9794:
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Summary: JDBCOutputFormat does not consider idle connection and
multithreads synchronization
Key: FLINK-9794
URL: https://issues.apache.org/jira/browse/FLINK-9794
Project: Flink
Issue Type: Bug
Components: Streaming Connectors
Affects Versions: 1.5.0, 1.4.0
Reporter: wangsan
Current implementation of JDBCOutputFormat has two potential problems:
1. The Connection was established when JDBCOutputFormat is opened, and will be
used all the time. But if this connection lies idle for a long time, the
database will force close the connection, thus errors may occur.
2. The flush() method is called when batchCount exceeds the threshold, but it
is also called while snapshotting state. So two threads may modify upload and
batchCount, but without synchronization.
We need fix these two problems to make JDBCOutputFormat more reliable.
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