Re: redo failed in physical streaming replication while stopping the master server

/*                 * If at page start, we must skip over the page header.  But
we can't                 * do that until we've read in the page, since the header
size is                 * variable.                 */ 

i don't know the meaning behind this comments,
if ((RecPtr->xrecoff % XLogSegSize) == 0) 
it's a long page header, else a short page header,

so "the header size" can be calculated ? right?



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