Re: [E] Re: BUG #18938: Logical replication failure in 16.9: "invalid memory alloc request size 1372786672"

Hi,
Thanks very much for your reply.

> The configuration details would help the investigation.

Here are all configs which may be relevant:

wal_level = logical
max_replication_slots = 20
max_logical_replication_workers = 14
max_wal_senders = 20
wal_keep_size = 4096
max_wal_size = 4GB
min_wal_size = 1GB
wal_sender_timeout = 300s
archive_mode = on
archive_command = 'true'
archive_timeout = 3600
max_worker_processes = 18
max_connections = 1000
shared_buffers = 10GB
maintenance_work_mem = 2GB
work_mem = 26214kB
effective_cache_size = 30GB
effective_io_concurrency = 200

> IIUC this issue could happen especially if there are many concurrent
> transactions that perform DDLs. Does this match the workload on your
> server?

I'm not sure if our workload would contain "many concurrent transactions that perform DDLs." Our workload includes DDLs to create temporary tables and also "ALTER TABLE ENABLE/DISABLE TRIGGER" statements that are single-threaded, but may run concurrently with other DML operations. So, in our workloads, there is a possibility of overlap between DDL (trigger management and temporary table creation) and DML from other sessions.

Please let me know if you need any additional details.

John Hutchins
Wisconsin Court System DBA