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sync_es: fix flush_interval behavior during slow times

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instead of flushing every N seconds, it flushed N seconds after
the last change, which could drag out to N seconds * M batch size
if there are few updates. Practically this doesn't change anything
since stuff is always happening.

Also fix not writing a save point if nothing is happening. Also
practically does nothing, but for correctness.
This commit is contained in:
queue 2017-05-28 20:14:14 -06:00
parent 33852a55bf
commit eceb8824dc
1 changed files with 39 additions and 26 deletions
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31
sync_es.py
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@ -263,25 +263,29 @@ class EsPoster(ExitingThread):
last_save = time.time() last_save = time.time()
since_last = 0 since_last = 0
# XXX keep track of last posted position for save points, awkward
posted_log_file = None
posted_log_pos = None
while True: while True:
actions = [] actions = []
while len(actions) < self.chunk_size: now = time.time()
# wait up to flush_interval seconds after starting the batch
deadline = now + self.flush_interval
while len(actions) < self.chunk_size and now < deadline:
timeout = deadline - now
try: try:
# grab next event from queue with metadata that creepily # grab next event from queue with metadata that creepily
# updates, surviving outside the scope of the loop # updates, surviving outside the scope of the loop
((log_file, log_pos, timestamp), action) = \ ((log_file, log_pos, timestamp), action) = \
self.read_buf.get(block=True, timeout=self.flush_interval) self.read_buf.get(block=True, timeout=timeout)
actions.append(action) actions.append(action)
now = time.time()
except Empty: except Empty:
# nothing new for the whole interval # nothing new for the whole interval
break break
if not actions: if actions:
# nothing to post
log.debug("no changes...")
continue
# XXX "time" to get histogram of no events per bulk # XXX "time" to get histogram of no events per bulk
stats.timing('actions_per_bulk', len(actions)) stats.timing('actions_per_bulk', len(actions))
@ -300,17 +304,26 @@ class EsPoster(ExitingThread):
except KeyError: except KeyError:
raise bie raise bie
# how far we've gotten in the actual log
posted_log_file = log_file
posted_log_pos = log_pos
# how far we're behind, wall clock # how far we're behind, wall clock
stats.gauge('process_latency', int((time.time() - timestamp) * 1000)) stats.gauge('process_latency', int((time.time() - timestamp) * 1000))
else:
log.debug("no changes...")
since_last += len(actions) since_last += len(actions)
if since_last >= 10000 or (time.time() - last_save) > 10: # TODO instead of this manual timeout loop, could move this to another queue/thread
if posted_log_file is not None and (since_last >= 10000 or (time.time() - last_save) > 10):
log.info(f"saving position {log_file}/{log_pos}, {time.time() - timestamp:,.3f} seconds behind") log.info(f"saving position {log_file}/{log_pos}, {time.time() - timestamp:,.3f} seconds behind")
with stats.timer('save_pos'): with stats.timer('save_pos'):
with open(SAVE_LOC, 'w') as f: with open(SAVE_LOC, 'w') as f:
json.dump({"log_file": log_file, "log_pos": log_pos}, f) json.dump({"log_file": posted_log_file, "log_pos": posted_log_pos}, f)
last_save = time.time() last_save = time.time()
since_last = 0 since_last = 0
posted_log_file = None
posted_log_pos = None
# in-memory queue between binlog and es. The bigger it is, the more events we # in-memory queue between binlog and es. The bigger it is, the more events we
# can parse in memory while waiting for es to catch up, at the expense of heap. # can parse in memory while waiting for es to catch up, at the expense of heap.