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Optimise catch up replication #480

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@kjnilsson

Description

@kjnilsson

Is your feature request related to a problem? Please describe.

Currently when sending logs to a lagging member the ra leader process has to do the read from disk which affects latency and throughput.

Describe the solution you'd like

Introduce a new leader companion process that does the read and replication work so it is performed outside of the ra leader process.

Describe alternatives you've considered

.

Additional context

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