<para> The result is equivalent to replacing the target data directory with the source one. Only changed blocks from relation files are copied; all other files are copied in full, including configuration files. The advantage of <application>pg_rewind</> over taking a new base backup, or tools like <application>rsync</>, is that <application>pg_rewind</> does not require reading through unchanged blocks in the cluster. This makes it a lot faster when the database is large and only a small fraction of blocks differ between the clusters. </para>
At least, this paragraph need to be adjusted, because it states whose files are copied. And probably latter paragraphs whose state about WAL files.
Your are rigth.
I wrote a draft as following, but i'm afraid whether the english statement is accurate.
I'm not native english speaker too :(
Only the WAL files between the point of divergence and the current WAL insert location of the source server are copied, *for* other WAL files are useless for the target server.
I'm not sure about this usage of word *for*. For me, it probably should be just removed. Rest of changes looks good for me. Please, integrate them into the patch.
