all replication slots are in use Hint: Free one or increase max_replication_slots.

提交flinksql作业（pgsql-cdc）时报错：all replication slots are in use  Hint: Free one or increase max_replication_slots.

此时查看task-managers，发现slot并未使用完，仍有空闲

 查看flink原始日志：

文中抛错为PSQLException, 考虑是pgsql数据库的配置问题

进入服务器：输入lsblk，查看镜像，cd 镜像路径，进入镜像，找到pgsql安装目录

修改postgresql.conf文件中的参数：

    max_wal_senders = 1000		     # max number of walsender processes
	max_replication_slots = 1000     # max number of replication slots

 重启数据库，使用show al