Github user rmetzger commented on the pull request:
https://github.com/apache/incubator-flink/pull/226#issuecomment-65772842
The simplest workaround is to run only one instance of the source in the
cluster ;)
Our JDBCInputFormat is also not parallel. We have an interface called
"NonParallelInput" that flags an InputFormat. The optimizer will automatically
execute the source with a DOP of 1.
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