From 5da1a52746a85a54b2809e8901da707a35d78e22 Mon Sep 17 00:00:00 2001
From: David Storch <david.storch@mongodb.com>
Date: Wed, 4 Nov 2020 17:07:16 -0500
Subject: SERVER-51524 Rename internalQueryCacheSize to
 internalQueryCacheMaxEntriesPerCollection

Retains "internalQueryCacheSize" as a deprecated alias.

The new name better reflects the function of the parameter,
as it controls the number of cache entries allowed for each
collection's cache rather than the overall size of the cache
in bytes.
---
 src/mongo/db/query/plan_cache.cpp  | 2 +-
 src/mongo/db/query/query_knobs.idl | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

(limited to 'src/mongo')

diff --git a/src/mongo/db/query/plan_cache.cpp b/src/mongo/db/query/plan_cache.cpp
index a3c3543b2f2..67e9020c369 100644
--- a/src/mongo/db/query/plan_cache.cpp
+++ b/src/mongo/db/query/plan_cache.cpp
@@ -431,7 +431,7 @@ std::string SolutionCacheData::toString() const {
 // PlanCache
 //
 
-PlanCache::PlanCache() : PlanCache(internalQueryCacheSize.load()) {}
+PlanCache::PlanCache() : PlanCache(internalQueryCacheMaxEntriesPerCollection.load()) {}
 
 PlanCache::PlanCache(size_t size) : _cache(size) {}
 
diff --git a/src/mongo/db/query/query_knobs.idl b/src/mongo/db/query/query_knobs.idl
index b23967929b0..52651caa6f0 100644
--- a/src/mongo/db/query/query_knobs.idl
+++ b/src/mongo/db/query/query_knobs.idl
@@ -90,11 +90,12 @@ server_parameters:
   # Plan cache
   #
 
-  internalQueryCacheSize:
+  internalQueryCacheMaxEntriesPerCollection:
     description: "The maximum number of entries allowed in a given collection's plan cache."
     set_at: [ startup, runtime ]
-    cpp_varname: "internalQueryCacheSize"
+    cpp_varname: "internalQueryCacheMaxEntriesPerCollection"
     cpp_vartype: AtomicWord<int>
+    deprecated_name: "internalQueryCacheSize"
     default: 5000
     validator:
       gte: 0
-- 
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