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Reduce memory footprint of state messages #212

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Merged
merged 2 commits into from
Apr 16, 2022
Merged

Reduce memory footprint of state messages #212

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5c0e666
Reduce memory footprint due to storing state messages
laurentS Feb 8, 2022
2b76852
Merge branch 'master' into pr/212
ericboucher Apr 16, 2022
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11 changes: 8 additions & 3 deletions target_postgres/stream_tracker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,9 +48,9 @@ def flush_streams(self, force=False):

self._emit_safe_queued_states(force=force)

def handle_state_message(self, line_data):
def handle_state_message(self, line):
if self.emit_states:
self.state_queue.append({'state': line_data['value'], 'watermark': self.message_counter})
self.state_queue.append({'state': line, 'watermark': self.message_counter})
self._emit_safe_queued_states()

def handle_record_message(self, stream, line_data):
Expand Down Expand Up @@ -80,9 +80,14 @@ def _emit_safe_queued_states(self, force=False):
valid_flush_watermarks.append(watermark)
safe_flush_threshold = min(valid_flush_watermarks, default=0)

# the STATE message that the target forwards
emittable_state = None
emittable_state_str = None
while len(self.state_queue) > 0 and (force or self.state_queue[0]['watermark'] <= safe_flush_threshold):
emittable_state = self.state_queue.popleft()['state']
emittable_state_str = self.state_queue.popleft()['state']

if emittable_state_str is not None:
emittable_state = json.loads(emittable_state_str)['value']

if emittable_state:
if len(statediff.diff(emittable_state, self.last_emitted_state or {})) > 0:
Expand Down
3 changes: 2 additions & 1 deletion target_postgres/target_tools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,7 +152,8 @@ def _line_handler(state_tracker, target, invalid_records_detect, invalid_records
state_tracker.flush_stream(line_data['stream'])
target.activate_version(stream_buffer, line_data['version'])
elif line_data['type'] == 'STATE':
state_tracker.handle_state_message(line_data)
# pass the string instead of the deserialized object to save memory in the deque
state_tracker.handle_state_message(line)
else:
raise TargetError('Unknown message type {} in message {}'.format(
line_data['type'],
Expand Down