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Message #50381
[Bug 1557640] Re: DHCP agent logging is causing performance issues
** Also affects: neutron/kilo
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1557640
Title:
DHCP agent logging is causing performance issues
Status in neutron:
Fix Released
Status in neutron kilo series:
New
Bug description:
When a new port gets added or removed, the DHCP agent is currently
dumping the entirety of the hosts file in the logs. This is a problem
in some deployments we have encountered, some of which with upwards of
10000 ports.
Change-Id: I3ad7864eeb2f959549ed356a1e34fa18804395cc removed logging
calls from inside the loop. It also added two new log calls: one at
the beginning of the loop that builds the hosts file in memory and one
at the end, that also includes the full content. Those could be useful
pieces of debugging information. However, adding the host file
contents can get expensive when there are large numbers of ports.
For large numbers of ports, it can take more than one hour for the
agent to sync up. The log output contributes a significant amount of
that time.
This was introduced in Liberty. One reviewer at the time had already
expressed concerns about the impact of the log call.
Will propose a patch to keep the log message, but remove the file
contents.
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References