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https://issues.apache.org/jira/browse/FLINK-4940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek reassigned FLINK-4940:
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Assignee: (was: Stefan Richter)
> Add Support for Broadcast/Global State
> --------------------------------------
>
> Key: FLINK-4940
> URL: https://issues.apache.org/jira/browse/FLINK-4940
> Project: Flink
> Issue Type: Sub-task
> Components: Streaming
> Reporter: Aljoscha Krettek
>
> We need this to support the pattern where you have one input of a two-input
> operator keyed and the other input carries messages that should be broadcast
> to all operator instances. This other (side) input can contain configuration
> updates, models, or what have you that are relevant for all elements in the
> other stream.
> We should add something akin to {{KeyedStateBackend}} where state is kept by
> operator. When checkpointing, we only checkpoint the state of the first
> operator instance because we assume the state to be the same across all
> instances. When restoring we restore the one snapshot to all operator
> instances.
> Current thinking is that this global/broadcast state backend should allow
> access by key and possibly also iteration over all stored keys.
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