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https://issues.apache.org/jira/browse/BEAM-3780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387040#comment-16387040
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Luke Cwik commented on BEAM-3780:
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LengthPrefixUnknownCoders has methods to create a coder specification for the
runner and for the SDK. Is the issue that a singular graph representation is
being used in the Runner so you can differentiate SDK and Runner specific
segments?
> Add a utility to instantiate a partially unknown coder
> ------------------------------------------------------
>
> Key: BEAM-3780
> URL: https://issues.apache.org/jira/browse/BEAM-3780
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Thomas Groh
> Assignee: Thomas Groh
> Priority: Major
>
> Coders must be understood by the SDK harness that is encoding or decoding the
> associated elements. However, the pipeline runner is capable of constructing
> partial coders, where an unknown coder is replaced with a ByteArrayCoder. It
> then can decompose the portions of elements it is aware of, without having to
> understand the custom element encodings.
>
> This should go in CoderTranslation, as an alternative to the full-fidelity
> rehydration of a coder.
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