[jira] [Created] (FLINK-19162) Allow Split Reader based sources to reuse record batches

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-19162:
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             Summary: 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
             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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