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WAIT FOR LSN compares only the numeric LSN and has no notion of which timeline a WAL record belongs to. There are many possible scenarios when timeline-switching can break read-your-writes consistency. The proper analysis and timeline support is possible in the next major release. Yet just document the current behaviour. Reported-by: Xuneng Zhou <xunengzhou@gmail.com> Author: Alexander Korotkov <aekorotkov@gmail.com>