[FLINK-29944] Support accumulator in source reader - ASF JIRA

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Details

Type: Improvement
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: 1.17.0
Fix Version/s: None
Component/s: API / DataStream
Labels:
- auto-deprioritized-critical
- pull-request-available

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https://github.com/apache/flink/pull/21258

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link https://github.com/apache/flink/pull/21258

Description

Source Reader is mainly for union batch and streaming logic in single interface, it's good point for the developer, but in the SourceFunction we can access runtimeconext to use accumulator before, now the SourceReaderContext have no method for it, this PR is mainly to support it.