On Sun, Dec 14, 2014 at 5:45 AM, Simon Riggs <si...@2ndquadrant.com> wrote: > On 13 December 2014 at 14:36, Michael Paquier <michael.paqu...@gmail.com> > wrote: > >> Something to be aware of btw is that this patch introduces an >> additional 8 bytes per block image in WAL as it contains additional >> information to control the compression. In this case this is the >> uint16 compress_len present in XLogRecordBlockImageHeader. > > So we add 8 bytes to all FPWs, or only for compressed FPWs? In this case that was all. We could still use xl_info to put a flag telling that blocks are compressed, but it feels more consistent to have a way to identify if a block is compressed inside its own header. -- Michael
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