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https://issues.apache.org/jira/browse/FLINK-16311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai closed FLINK-16311.
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Fix Version/s: statefun-1.1
Resolution: Fixed
Merged to master via 64bf21835be12c86e01c5fdc6379c080c141b79a
> PersistedAppendingBuffer state primitive has incorrect contracts for view()
> method
> ----------------------------------------------------------------------------------
>
> Key: FLINK-16311
> URL: https://issues.apache.org/jira/browse/FLINK-16311
> Project: Flink
> Issue Type: Bug
> Components: Stateful Functions
> Affects Versions: statefun-1.1
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Blocker
> Labels: pull-request-available
> Fix For: statefun-1.1
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> The {{PersistedAppendingBuffer}} state primitive in Stateful Functions,
> states that {{view()}} returns {{null}} if the buffer wasn't accessed before,
> or after a {{clear()}}.
> This actually is not possible. The {{PersistedAppendingBuffer}} primitive is
> based on Flink's {{ListState}} state handle, which always returns an empty
> list if the elements of the list is empty, and never a {{null}}.
> This means that the {{PersistedAppendingBuffer}} won't be able to
> differentiate the cases (e.g. if the state wasn't accessed or cleared v.s. an
> empty buffer).
> We suggest to just change the contract so that
> {{PersistedAppendingBuffer#view()}} follows the behavior of Flink's
> {{ListState}} to never return null.
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