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Optimise queueing of inbound replication commands (#7861)
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When we get behind on replication, we tend to stack up background processes
behind a linearizer. Bg processes are heavy (particularly with respect to
prometheus metrics) and linearizers aren't terribly efficient once the queue
gets long either.

A better approach is to maintain a queue of requests to be processed, and
nominate a single process to work its way through the queue.

Fixes: #7444
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richvdh committed Jul 16, 2020
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Optimise queueing of inbound replication commands.
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