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https://issues.apache.org/jira/browse/FLINK-19162?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen closed FLINK-19162.
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> Allow Split Reader based sources to reuse record batches
> ---------------------------------------------------------
>
> Key: FLINK-19162
> URL: https://issues.apache.org/jira/browse/FLINK-19162
> Project: Flink
> Issue Type: Sub-task
> Components: Connectors / Common
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Priority: Major
> Fix For: 1.12.0
>
>
> The Split Readers hand over a batch of records at a time from the I/O thread
> (fetching and decoding) to the main operator processing thread.
> These structures can memory intensive and expensive and performance greatly
> benefits from reusing them. This is especially true for high-performance
> format readers like ORC and Parquet.
> While previous sources (where I/O was in the main thread) could reuse objects
> in a trivial manner, the new Split Reader API (with multiple threads) needs
> an explicit {{recycle()}} hook to allow returning/reusing these objects.
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