zhijiang created FLINK-10462:
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Summary: Remove ConnectionIndex for further sharing tcp connection
in credit-based mode
Key: FLINK-10462
URL: https://issues.apache.org/jira/browse/FLINK-10462
Project: Flink
Issue Type: Improvement
Components: Network
Affects Versions: 1.5.4, 1.6.1, 1.6.0, 1.5.3, 1.5.2, 1.5.1, 1.5.0
Reporter: zhijiang
Assignee: zhijiang
Every {{IntermediateResult}} generates a random {{ConnectionIndex}} which will
be included in {{ConnectionID}}.
The {{RemoteInputChannel}} requests to establish tcp connection via
{{ConnectionID}}. That means one tcp connection may be shared by multiple
{{RemoteInputChannel}}s which have the same {{ConnectionID}}. To do so, we can
reduce the physical connections between two {{TaskManager}}s, and it bring
benefits for large scale jobs.
But this sharing is limited only for the same {{IntermediateResult}}, and I
think it is mainly because we may temporarily switch off {{autoread}} for the
channel during back pressure in previous network flow control. For credit-based
mode, the channel is always open for transporting different intermediate data,
so we can further share the tcp connection for different {{IntermediateResult}}
to remove the limit.
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