Reduce the cache entry expiration TTL

If Redis goes down then its persisted data can get out of sync with Pulp, because cache invalidation events cannot occur. We should mitigate the impact by letting cache entries expire after a shorter period of time. closes: #8996 https://pulp.plan.io/issues/8996
pulp · Jul 13, 2021 · 017b0b1 · 017b0b1
1 parent ca0ef8f
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diff --git a/CHANGES/8996.misc b/CHANGES/8996.misc
@@ -0,0 +1 @@
+Reduced the default expiration TTL of entries in the Pulp content app cache.
diff --git a/docs/configuration/settings.rst b/docs/configuration/settings.rst
@@ -211,6 +211,8 @@ CACHE_SETTINGS
 
    * ``EXPIRES_TTL`` - Number of seconds entries should stay in the cache before expiring.
 
+   Defaults to ``600`` seconds.
+
    .. note::
      Set to ``None`` to have entries not expire.
      Content app responses are always invalidated when the backing distribution is updated.

diff --git a/pulpcore/app/settings.py b/pulpcore/app/settings.py
@@ -242,7 +242,7 @@
 # https://docs.pulpproject.org/pulpcore/configuration/settings.html#pulp-cache
 CACHE_ENABLED = True
 CACHE_SETTINGS = {
-    "EXPIRES_TTL": 86400,
+    "EXPIRES_TTL": 600,  # 10 minutes
 }
 
 SPECTACULAR_SETTINGS = {