pgpool配置读写分离（不允许主从切换）出现如下日志的原因是什么呢？

pgpool: 2017-12-23 14:05:49: pid 23524: LOG: degenerate backend request for node_id: 0 from pid [23524] is canceled because failover is disallowed on the node
pgpool: 2017-12-23 14:05:49: pid 23524: WARNING: write on backend 0 failed with error :"Success"
pgpool: 2017-12-23 14:05:49: pid 23524: DETAIL: while trying to write data from offset: 0 wlen: 5
pgpool: 2017-12-23 14:05:49: pid 23524: WARNING: write on backend 1 failed with error :"Success"
pgpool: 2017-12-23 14:05:49: pid 23524: DETAIL: while trying to write data from offset: 0 wlen: 5
pgpool: 2017-12-23 14:05:49: pid 23497: LOG: child process with pid: 23524 exits with status 256

pgpool: 2017-12-23 14:05:49: pid 23529: LOG: degenerate backend request for node_id: 0 from pid [23529] is canceled because failover is disallowed on the node
pgpool: 2017-12-23 14:05:49: pid 23529: WARNING: write on backend 0 failed with error :"Success"
pgpool: 2017-12-23 14:05:49: pid 23529: DETAIL: while trying to write data from offset: 0 wlen: 5
pgpool: 2017-12-23 14:05:49: pid 23529: WARNING: write on backend 1 failed with error :"Success"
pgpool: 2017-12-23 14:05:49: pid 23529: DETAIL: while trying to write data from offset: 0 wlen: 5
pgpool: 2017-12-23 14:05:49: pid 23497: LOG: fork a new child process with pid: 26016
pgpool: 2017-12-23 14:05:49: pid 23497: LOG: child process with pid: 23529 exits with status 256
pgpool: 2017-12-23 14:05:49: pid 23497: LOG: fork a new child process with pid: 26017