#87 barman don't get WAL segment in WAL streaming mode

[Artem Tuchinsky]

Hello!
I have postgresql 9.6 and barman 2.1 configured for WAL streaming. If I check backup settings I see error "WAL archive: FAILED (please make sure WAL shipping is setup)"

[root@labs-barman ~]# barman check labs-postgresql-1
Server labs-postgresql-1:
WAL archive: FAILED (please make sure WAL shipping is setup)
PostgreSQL: OK
superuser: OK
PostgreSQL streaming: OK
wal_level: OK
replication slot: OK
directories: OK
retention policy settings: OK
backup maximum age: OK (no last_backup_maximum_age provided)
compression settings: OK
failed backups: OK (there are 0 failed backups)
minimum redundancy requirements: OK (have 0 backups, expected at least 0)
pg_basebackup: OK
pg_basebackup compatible: OK
pg_basebackup supports tablespaces mapping: OK
pg_receivexlog: OK
pg_receivexlog compatible: OK
receive-wal running: OK
archiver errors: OK

This my barman configs:

[root@labs-barman ~]# cat /etc/barman.conf |grep -v \;

[barman]
barman_user = barman
configuration_files_directory = /etc/barman.d
barman_home = /var/lib/barman
log_file = /var/log/barman/barman.log
log_level = INFO
compression = gzip
retention_policy = RECOVERY WINDOW OF 7 DAYS

[root@labs-barman ~]# cat /etc/barman.d/labs-postgresql-1.conf |grep -v \;

[labs-postgresql-1]
description = "Example of PostgreSQL Database (Streaming-Only)"
conninfo = host=172.29.150.73 user=postgres dbname=postgres
streaming_conninfo = host=172.29.150.73 user=streaming_barman
backup_method = postgres
streaming_backup_name = barman_streaming_backup
streaming_archiver = on
slot_name = backup
streaming_archiver_name = barman_receive_wal
path_prefix = "/usr/pgsql-9.6/bin"

On postgresql server in pg_stat_replication i see this:

postgres=# select usename,application_name,state,sent_location,write_location,flush_location,replay_location,sync_state from pg_stat_replication;
usename | application_name | state | sent_location | write_location | flush_location | replay_location | sync_state
------------------+--------------------+-----------+---------------+----------------+----------------+-----------------+------------
postgres | walreceiver | streaming | 0/10000808 | 0/10000808 | 0/10000808 | 0/10000808 | async
streaming_barman | barman_receive_wal | streaming | 0/10000808 | 0/10000808 | 0/10000000 | | async
(2 rows)

barman trying to get first WAL segment, but another postgres server (replica) successfully received all WAL segments

What is the cause of the problem?