Re: Changeset Extraction v7.3

Hi,

Here's the next version of the patchset. The following changes have been
made:
* move xmin pegging and more logic responsibility to procarray.c
* split all support for changeset extraction from the initial slot patch
* always register an before_shmem_exit handler when
  max_replication_slots is registered, not just while a slot is acquired
* move some patch hunks to earlier patches, especially the
  ReplicationSlotAcquire() call for physical rep that accidentally
  slipped and the SQL accessible slot manipulation functions
* minor stuff

Greetings,

Andres Freund

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 Andres Freund                       http://www.2ndQuadrant.com/
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