fix: Remove double pickling for cached payloads #10222
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john-bodley
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Jul 1, 2020
| @@ -260,14 +258,8 @@ def get_df_payload( # pylint: disable=too-many-locals,too-many-statements | |||
| if is_loaded and cache_key and cache and status != utils.QueryStatus.FAILED: | |||
| try: | |||
| cache_value = dict(dttm=cached_dttm, df=df, query=query) | |||
| cache_binary = pkl.dumps(cache_value, protocol=pkl.HIGHEST_PROTOCOL) | |||
|
|
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| logger.info( | |||
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I annexed this as we no longer a priori know the size of the payload and it seems somewhat like an unnecessary comment.
mistercrunch
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Jul 2, 2020
| stats_logger.incr("set_cache_key") | ||
| cache.set(cache_key, cache_binary, timeout=self.cache_timeout) | ||
| cache.set(cache_key, cache_value, timeout=self.cache_timeout) |
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random thought [out of scope for this PR], we should time this operation eventually
mistercrunch
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Jul 2, 2020
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Co-authored-by: John Bodley <[email protected]>
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SUMMARY
It seems we pickle the visualization payloads et al. prior to caching via the Flask-Caching package, however for all backends as part of the set/get logic the object to cache is pickled and the unpicked respectively, i.e., for Redis the set and get methods call
dump_objectandload_objectrespectively which in turn callspickle.dumpsandpickle.loads, hence we were actually double pickling the payloads.BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
TEST PLAN
CI.
ADDITIONAL INFORMATION