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(parent: 4429f6a) | patch

Pre-pad WAL files when streaming transaction log

Pre-pad WAL files when streaming transaction log

Instead of filling files as they appear, pre-pad the
WAL files received when streaming xlog the same way
that the server does. Data is streamed into a .partial
file which is then renamed()d into palce when it's complete,
but it will always be 16MB.

This also means that the starting position for pg_receivexlog
is now simply right after the last complete segment, and we
never need to deal with partial segments there.

Patch by me, review by Fujii Masao

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