Magnus Hagander <magnus(at)hagander(dot)net> writes:
> On Wed, Feb 17, 2010 at 06:55, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>> 2. Straightforwardly observe the alignment rule. Since the received WAL
>> data might start at the middle of WAL block, walreceiver needs to keep
>> the last half-written WAL block for alignment. OTOH since the received
>> data might end at the middle of WAL block, walreceiver needs zero-padding.
>> As a result, walreceiver writes the set of the last WAL block, received
>> data and zero-padding.
> May there be other reasons to d this as well?
Writing misaligned data is certain to be expensive even when it works...
regards, tom lane