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reconnect: Add ability to do a number of retries without backoff.

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This is aimed at an upcoming database clustering implementation, where it's
desirable to try all of the cluster members quickly before backing off to
retry them again in sequence.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Russell Bryant <russell@ovn.org>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Justin Pettit <jpettit@ovn.org>
This commit is contained in:
Ben Pfaff
2018-01-22 11:04:58 -08:00
parent f70b61d33d
commit 5ee527e223
6 changed files with 145 additions and 36 deletions
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53
python/ovs/reconnect.py
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@@ -154,6 +154,7 @@ class Reconnect(object):
self.last_connected = None
self.last_disconnected = None
self.max_tries = None
self.backoff_free_tries = 0
self.creation_time = now
self.n_attempted_connections = 0
@@ -242,6 +243,12 @@ class Reconnect(object):
self.backoff > self.max_backoff):
self.backoff = self.max_backoff
def set_backoff_free_tries(self, backoff_free_tries):
"""Sets the number of connection attempts that will be made without
backoff to 'backoff_free_tries'. Values 0 and 1 both
represent a single attempt."""
self.backoff_free_tries = backoff_free_tries
def set_probe_interval(self, probe_interval):
"""Sets the "probe interval" to 'probe_interval', in milliseconds. If
this is zero, it disables the connection keepalive feature. If it is
@@ -337,7 +344,7 @@ class Reconnect(object):
else:
self.info_level("%s: error listening for connections"
% self.name)
else:
elif self.backoff < self.max_backoff:
if self.passive:
type_ = "listen"
else:
@@ -352,8 +359,15 @@ class Reconnect(object):
if (self.state in (Reconnect.Active, Reconnect.Idle)):
self.last_disconnected = now
if not self.__may_retry():
self._transition(now, Reconnect.Void)
return
# Back off
if (self.state in (Reconnect.Active, Reconnect.Idle) and
if self.backoff_free_tries > 1:
self.backoff_free_tries -= 1
self.backoff = 0
elif (self.state in (Reconnect.Active, Reconnect.Idle) and
(self.last_activity - self.last_connected >= self.backoff or
self.passive)):
if self.passive:
@@ -363,23 +377,26 @@ class Reconnect(object):
else:
if self.backoff < self.min_backoff:
self.backoff = self.min_backoff
elif self.backoff >= self.max_backoff / 2:
self.backoff = self.max_backoff
else:
elif self.backoff < self.max_backoff / 2:
self.backoff *= 2
if self.passive:
self.info_level("%s: waiting %.3g seconds before trying "
"to listen again"
% (self.name, self.backoff / 1000.0))
if self.passive:
action = "trying to listen again"
else:
action = "reconnect"
self.info_level("%s: waiting %.3g seconds before %s"
% (self.name, self.backoff / 1000.0,
action))
else:
self.info_level("%s: waiting %.3g seconds before reconnect"
% (self.name, self.backoff / 1000.0))
if self.__may_retry():
self._transition(now, Reconnect.Backoff)
else:
self._transition(now, Reconnect.Void)
if self.backoff < self.max_backoff:
if self.passive:
action = "try to listen"
else:
action = "reconnect"
self.info_level("%s: continuing to %s in the "
"background but suppressing further "
"logging" % (self.name, action))
self.backoff = self.max_backoff
self._transition(now, Reconnect.Backoff)
def connecting(self, now):
"""Tell this FSM that a connection or listening attempt is in progress.
@@ -390,7 +407,7 @@ class Reconnect(object):
if self.state != Reconnect.ConnectInProgress:
if self.passive:
self.info_level("%s: listening..." % self.name)
else:
elif self.backoff < self.max_backoff:
self.info_level("%s: connecting..." % self.name)
self._transition(now, Reconnect.ConnectInProgress)