fanrui created FLINK-27789:
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Summary: LegacySource compatible with overdraft buffer
Key: FLINK-27789
URL: https://issues.apache.org/jira/browse/FLINK-27789
Project: Flink
Issue Type: Sub-task
Components: Connectors / Common, Runtime / Checkpointing, Runtime /
Network
Reporter: fanrui
Fix For: 1.16.0
Since LegacySource does not have checkAvailable, LegacySource will use all
overdraft buffers by default, this is not what we expected.
So we'll set overdraft=0 for the SourceStreamTask.
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