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https://issues.apache.org/jira/browse/FLINK-1149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske resolved FLINK-1149.
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Resolution: Fixed
Fixed with 986f25f6b51e3672865439e9a6581aab121b45ee
> Operators cannot adapt DOP for NonParallelInputs
> ------------------------------------------------
>
> Key: FLINK-1149
> URL: https://issues.apache.org/jira/browse/FLINK-1149
> Project: Flink
> Issue Type: Bug
> Components: Java API
> Affects Versions: 0.6.1-incubating, 0.7-incubating
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
> Priority: Minor
>
> InputFormats that cannot be processed in parallel implement the
> NonParallelInput interface.
> During optimization, the optimizer checks for this interface and sets the DOP
> of an operator to 1 if it is found. Other operators such as Mappers set their
> DOP during program construction to the DOP of their preceding task (if not
> specified otherwise). Since non-splittable data sources are only considered
> later by the optimizer, a Map operator will not have the same DOP as an
> preceding non-splittable data source.
> The simple solution is to set the DOP of a non-splittable data source during
> program construction.
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