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https://issues.apache.org/jira/browse/FLINK-18558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jingsong Lee closed FLINK-18558.
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Assignee: Caizhi Weng
Resolution: Fixed
master: 791e276c8346a49130cb096bafa128d7f1231236
> Introduce collect iterator with at least once semantics and exactly once
> semantics without fault tolerance
> ----------------------------------------------------------------------------------------------------------
>
> Key: FLINK-18558
> URL: https://issues.apache.org/jira/browse/FLINK-18558
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream, Table SQL / API
> Reporter: Caizhi Weng
> Assignee: Caizhi Weng
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> Currently {{TableResult#collect}} and {{DataStreamUtils#collect}} can only
> produce results if users explicitly enable checkpoint for infinite streaming
> jobs. It would be strange to require the users to do so if they just want to
> take a look at their data.
> We should introduce collect iterator with at least once semantics and exactly
> once semantics without fault tolerance. When calling the {{collect}} method,
> we should automatically pick an iterator for the user:
> * If the user does not explicitly enable a checkpoint, we use exactly once
> iterator without fault tolerance. That is to say, the iterator will throw
> exception once the job restarts.
> * If the user explicitly enables an exactly once checkpoint, we use the
> current implementation of collect iterator.
> * If the user explicitly enables an at least once checkpoint, we use the at
> least once iterator. That is to say, the iterator ignores both checkpoint
> information and job restarts.
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