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Logging and logcontext fixes for Limiter

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Add some logging to the Limiter in a similar spirit to the Linearizer, to help
debug issues.

Also fix a logcontext leak.

Also refactor slightly to avoid throwing exceptions.
This commit is contained in:
Richard van der Hoff 2017-11-07 00:48:57 +00:00
parent f851bc8182
commit bf993db11c
1 changed files with 17 additions and 7 deletions
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24
synapse/util/async.py
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@ -278,8 +278,13 @@ class Limiter(object):
if entry[0] >= self.max_count: if entry[0] >= self.max_count:
new_defer = defer.Deferred() new_defer = defer.Deferred()
entry[1].append(new_defer) entry[1].append(new_defer)
logger.info("Waiting to acquire limiter lock for key %r", key)
with PreserveLoggingContext(): with PreserveLoggingContext():
yield new_defer yield new_defer
logger.info("Acquired limiter lock for key %r", key)
else:
logger.info("Acquired uncontended limiter lock for key %r", key)
entry[0] += 1 entry[0] += 1
@ -288,16 +293,21 @@ class Limiter(object):
try: try:
yield yield
finally: finally:
logger.info("Releasing limiter lock for key %r", key)
# We've finished executing so check if there are any things # We've finished executing so check if there are any things
# blocked waiting to execute and start one of them # blocked waiting to execute and start one of them
entry[0] -= 1 entry[0] -= 1
try:
entry[1].pop(0).callback(None) if entry[1]:
except IndexError: next_def = entry[1].pop(0)
# If nothing else is executing for this key then remove it
# from the map with PreserveLoggingContext():
if entry[0] == 0: next_def.callback(None)
self.key_to_defer.pop(key, None) elif entry[0] == 0:
# We were the last thing for this key: remove it from the
# map.
del self.key_to_defer[key]
defer.returnValue(_ctx_manager()) defer.returnValue(_ctx_manager())