pulsar
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[fix][txn] optimize the ack/send future in TransactionImpl
Motivation
The TransactionImpl stores a lot of future. This uses a lot of memory, and can be optimized to two futures. ### Modification Optimize the future list to single future.
Documentation
- [x]
doc-not-needed
Matching PR in forked repository
PR in forked repository: https://github.com/liangyepianzhou/pulsar/pull/5