Fails with pg_xlog/xlogtemp files

[man-brain]

It happens quite rare but it happens:

error reading xlog record: record with zero length at 1/D5000090
unexpected result while fetching remote files: ERROR:  could not open file "pg_xlog/xlogtemp.23056" for reading: No such file or directory

The servers diverged at WAL position 1/D4A081B0 on timeline 174.
Rewinding from Last common checkpoint at 1/D30A5650 on timeline 174

It seems that process_remote_file does not skip such files and I don't know if it safe to do.

Since I've caught it with 9.4 I write about it here. But it seems that version in master also does not handle this situation.

[michaelpq]

Indeed, it can happen. e11d9a0 should fix this.