On Mon, Sep 26, 2016 at 6:58 PM, Robert Haas <robertmh...@gmail.com> wrote:
>> That requires some kind of mutual exclusion mechanism, like an LWLock.
> No, it doesn't.  Shared memory queues are single-reader, single-writer.

The point is that there is a natural dependency when merging is
performed eagerly within the leader. One thing needs to be in lockstep
with the others. That's all.

Peter Geoghegan

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