Barman skipping backups and sometime failing due to max_wal_senders reaching set value

[Sourabh Singh]

Hello,

I am trying to understand how barman takes full backups. We have full backup (pg_basebackup) and wal streaming setup with barman. Full backups to run daily and wal streaming schedule is the default using barman cron. WAL streaming and archiving is continuous without any problem , however i see alot of "another cron process is running : skipping to next server" message in the log . Also the full backups dont run daily , it usually fails due to "FATAL: number of requested standby connections exceeds max_wal_senders".

I would like to point out that these are single instances with max_wal_senders set to 5 or 10 with one replication slot. Only streaming happening requiring wal sender process is barman. 

I hope I was able to make myself clear. Looking forward to experts insights and learning from them. 

Kind Regards

Sourabh