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Add debug flag in synapse/storage/_base.py for debugging the cache logic by comparing what is in the cache with what was in the database on every access
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@ -33,6 +33,7 @@ import sys
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import time
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import threading
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DEBUG_CACHES = False
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logger = logging.getLogger(__name__)
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@ -146,7 +147,17 @@ def cached(max_entries=1000, num_args=1, lru=False):
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@defer.inlineCallbacks
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def wrapped(self, *keyargs):
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try:
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defer.returnValue(cache.get(*keyargs))
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cached_result = cache.get(*keyargs)
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if DEBUG_CACHES:
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actual_result = yield orig(self, *keyargs)
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if actual_result != cached_result:
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logger.error(
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"Stale cache entry %s%r: cached: %r, actual %r",
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orig.__name__, keyargs,
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cached_result, actual_result,
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)
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raise ValueError("Stale cache entry")
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defer.returnValue(cached_result)
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except KeyError:
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sequence = cache.sequence
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