Github user sachingoel0101 commented on the pull request:
https://github.com/apache/flink/pull/966#issuecomment-127433865
@fhueske, in the life cycle of an Input format, the `open` method is called
several times in each parallel instance of the `DataSource` operator. Consider
for example, the simple example of adding an accumulator. Since access to
`RuntimeContext` is enabled only after configure, we will end up adding the
same accumulator several times, which of course would fail. This is why I
decided to add a `postConfigure` method.
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