https://bugzilla.samba.org/show_bug.cgi?id=7749
Summary: socket listen queue fills, rejects further connections
Product: rsync
Version: 2.6.9
Platform: x86
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P3
Component: core
AssignedTo: way...@samba.org
ReportedBy: rhals...@wikimedia.org
QAContact: rsync...@samba.org
We have run into an issue where the rsync daemon socket listen queue (accept
queue) is filling before it is able to accept() the incoming connection
requests. It appears that the rsync source code currently hard codes this
limit to 5.
On our deployment, we push our changes via dsh and sync to hundreds of servers
for Wikipedia in as fast a manner as possible. This is causing the systems to
back up in the listen backlog and failing multiple servers as they eventually
time out, being ignored by the rsync server in question. The socket.c source
shows this hard limit (presently set to 5). We were able to fix the bottleneck
by raising the hard-coded value to 255. We would propose that this be changed
to a configuration variable, which can default to the old value of 5.
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