[HACKERS] logical replication apply to run with sync commit off by default

Hi,

there has been discussion at the logical replication initial copy thread
[1] about making apply work with sync commit off by default for
performance reasons and adding option to change that per subscription.

Here I propose patch to implement this - it adds boolean column
subssynccommit to pg_subscription catalog which decides if
synchronous_commit should be off or local for apply. And it adds
SYNCHRONOUS_COMMIT = boolean to the list of WITH options for CREATE and
ALTER SUBSCRIPTION. When nothing is specified it will set it to false.

The patch is built on top of copy patch currently as there are conflicts
between the two and this helps a bit with testing of copy patch.

[1]
https://www.postgresql.org/message-id/CA+TgmoY7Lk2YKArcp4O=Qu=xOoR8j71MAd1OTEojAWmujE3k0w@mail.gmail.com

-- 
  Petr Jelinek                  http://www.2ndQuadrant.com/
  PostgreSQL Development, 24x7 Support, Training & Services

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