pg做基于时间点恢复的备份时，报这个错（ERROR: requested WAL segment 0000000100001EDD0000005E has already been removed。但是备库没有报这个错，这是什么情况啊，前天主库重启过，但主备目前是正常的。
-bash-4.2$ pg_basebackup -p5432 -Pv -Ft -Xf -D /data/basebackup pg_basebackup: initiating base backup, waiting for checkpoint to complete pg_basebackup: checkpoint completed pg_basebackup: write-ahead log start point: 1EDD/5EBA3B78 on timeline 1 pg_basebackup: error: could not get COPY data stream: ERROR: requested WAL segment 0000000100001EDD0000005E has already been removed pg_basebackup: removing contents of data directory “/data/basebackup” -bash-4.2$