> By the time the  startup process
> releases the AccessExclusiveLock acquired by the proposed 
> UNLOGGED -> normal conversion process, that relfilenode
> needs to be either  fully copied or unlinked all over again. 
> (Alternately, find some other  way to make sure queries don't
> read the half-copied file.)  

About this issue: how are AccessExclusiveLocks released on
the standby when the master crashes?

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