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https://issues.apache.org/jira/browse/FLINK-6131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082312#comment-16082312
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Aljoscha Krettek commented on FLINK-6131:
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Unfortunately, there has not been any progress. It turns out that doing this
properly might require more thinking. For example, the current design would use
buffering of elements until side input is ready. This can lead to problems and
it might be wise to instead block an input until data is ready. This does not
work with the current network stack, however, since we cannot block on one
input and not on the other without possibly creating a deadlock somewhere
upstream.
Working on the first two subtasks would still make sense, IMHO, but right now
people are working on different things.
> Add side inputs for DataStream API
> ----------------------------------
>
> Key: FLINK-6131
> URL: https://issues.apache.org/jira/browse/FLINK-6131
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> This is an umbrella issue for tracking the implementation of FLIP-17:
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-17+Side+Inputs+for+DataStream+API.
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