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Dynamic backoff for switch scan

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Have switch scan back off propritonate to time it takes to walk the
switches.  Avoid being back to back on switch scans.
This commit is contained in:
Jarrod Johnson 2017-10-27 16:50:39 -04:00
parent d5be1ccf8c
commit 8c21c59459
1 changed files with 14 additions and 1 deletions
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15
confluent_server/confluent/networking/macmap.py
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@ -241,13 +241,17 @@ def _map_switch_backend(args):
_nodesbymac[mac] = nodename
switchbackoff = 30
def find_node_by_mac(mac, configmanager):
now = util.monotonic_time()
if vintage and (now - vintage) < 90 and mac in _nodesbymac:
return _nodesbymac[mac]
# do not actually sweep switches more than once every 30 seconds
# however, if there is an update in progress, wait on it
for _ in update_macmap(configmanager, vintage and (now - vintage) < 30):
for _ in update_macmap(configmanager,
vintage and (now - vintage) < switchbackoff):
if mac in _nodesbymac:
return _nodesbymac[mac]
# If update_mac bailed out, still check one last time
@ -294,6 +298,8 @@ def _full_updatemacmap(configmanager):
global _nodesbymac
global _switchportmap
global _macsbyswitch
global switchbackoff
start = util.monotonic_time()
with mapupdating:
vintage = util.monotonic_time()
# Clear all existing entries
@ -338,6 +344,13 @@ def _full_updatemacmap(configmanager):
for ans in pool.imap(_map_switch, switchauth):
vintage = util.monotonic_time()
yield ans
endtime = util.monotonic_time()
duration = endtime - start
duration = duration * 15 # wait 15 times as long as it takes to walk
# avoid spending a large portion of the time hitting switches with snmp
# requests
if duration > switchbackoff:
switchbackoff = duration
def _dump_locations(info, macaddr, nodename=None):