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temp: Add temporary monitoring for large memcache keys #36034

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Dec 16, 2024
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temp: Add temporary monitoring for large memcache keys #36034

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10 changes: 10 additions & 0 deletions common/djangoapps/util/memcache.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@

from django.conf import settings
from django.utils.encoding import smart_str
from edx_django_utils.monitoring.utils import increment


def fasthash(string):
Expand Down Expand Up @@ -48,9 +49,18 @@ def safe_key(key, key_prefix, version):
# Attempt to combine the prefix, version, and key
combined = ":".join([key_prefix, version, key])

# Temporary: Add observability to large-key hashing to help us
# understand the safety of a cutover from md4 to blake2b hashing.
# See https://github.com/edx/edx-arch-experiments/issues/872
increment('memcache.safe_key.called')

# If the total length is too long for memcache, hash it
if len(combined) > 250:
combined = fasthash(combined)
# Temporary: See
# https://github.com/edx/edx-arch-experiments/issues/872 and
# previous comment.
increment('memcache.safe_key.hash_large')

# Return the result
return combined
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