Amit Sela created BEAM-1177:
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Summary: Input DStream "bundles" should be in serialized form and
include relevant metadata.
Key: BEAM-1177
URL: https://issues.apache.org/jira/browse/BEAM-1177
Project: Beam
Issue Type: Bug
Components: runner-spark
Reporter: Amit Sela
Assignee: Amit Sela
Currently, the input partitions hold "bundles" of read elements within the
{{mapWithStateDStream}} used for the read.
Since this is automatically shuffled, user-data (the read elements) should be
serialized using coders to avoid breaking (if user-data is not {{Kryo}}
serializable).
Even after BEAM-848 would complete, this {{MapWithStateDStream}} would be
checkpointed periodically and so it would still have to remain in serialized
form.
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