Named pipe as a source

Hello,

We want to use flume to get haproxy access logs stored in Hbase.
Flume node is running with haproxy on the same server sending to
collectors with Hbase sinks.
Haproxy only support logs by syslog UDP or unix socket (named pipe).

For now we use syslog UDP source. But if we restart flume for upgrade
for example, we lose some logs.
If we could use named pipe logs could be stored by the system while
flume is restarting and continue consuming without loss.

Is there a way to achieve this ?

Now we have to failover data flows to another twin server, stop haproxy
(to be sure) restart flume, start haproxy, then restore failover as
nominal state.

Thank you.