[improve][broker] Optimize Consumer.individualAck to avoid multiple call pendingAck to find acked consumer.

[lifepuzzlefun]

Motivation

Current broker logic of individualAck will try to locate position and which consumer is the acked message owner.

but the logic is not shared the information which will call this find logic multiple times.

eg. foreach ack messge:

1. getBatchSize will call find logic.
2. ack logic call find logic.
3. checkCanRemovePendingAcksAndHandle will call find logic.
4. removePendingAck will call find logic.

if the message is own by other consumers, and if consumer within one subscription is huge the performance is very low.

Modifications

just call one time find logic. and return the origin LongPair to extract information.
when the following logic try to use the pos and owner information. just pass the find owner consumer.

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• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

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• doc-complete

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